PDA

View Full Version : Anti-armor weapons of the japanese infantry.



Panzerknacker
10-21-2006, 08:46 PM
Kawamura Type 97 cal. 20 mm

http://img134.imageshack.us/img134/4412/hela1.jpg

The desing of this heavy antitank rifle belong to the ing. Masawa Kawamura who start the development in 1935.

For 1937 the desing was completed and the weapon was officially adopted for the army in 1937 ( some were bought for the Navy also). The working mechanism of this rifle is semiautomatic with an roting bolt wich is gas operated. The loading is made from the top (bren like) and in accept an 7 shot magazine.

The weight is about 55 kg , in order to carry it quickly 2 handlebars resembleming a bike could be atached in the front and the rear pad. For aditional protection in the shooting and 4 mm steel shield can be added, in this case the weight climbs to 66 kg.

The weapon is very powerful, it shoots a 20mm ( 20 mm round x125mm case) specially designed cartrigde, the muzzle velocity is about 815 m/s and is stated that it could penetrated the light M-3 stuart from 150 meters away.

http://img167.imageshack.us/img167/3861/tipo97tj0.jpg

tom!
10-22-2006, 04:45 AM
Hi.

Some additions:

The typ 97 20 mm automatic gun (original designation) was a side development of the type 98 20 mm aa-gun using the same muzzle break and other design parts. The total weight was 55 kg, 72,5 kg with handles. The shield wasn´t used often to increase mobility.

In 1943 the rifle was reworked to spare raw materials lowering the weight with handles to 59 kg.

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20typ%2097%20at%20rifle.jpg

The crew of one rifle was 4 men, gunner, loader, 2 ammunition carrier. A sqad consisted of two rifle teams, 1 squad leader (NCO) and 1 runner.

During transport the rifle was disassembled in two parts and carried by three horses with 150 shots. With cavalry units the rifle was loaded on 2 horses with 105 shots to increase mobility.

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20typ%2097%2020%20mm%20at%20gun%20carrying.jpg

The type 97 ap-round wit a muzzle velocity of 865 m/sec could penetrate 30 mm/90° on 350 m and 20 mm/90° on 700 m. Additionally the type 98 20X141 mm he-round could be fired against soft targets like field fortifications etc. The main charge was HMX and Nitropenta. Maximum range with the type 98 round was 4000 m.

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20typ%2097%20at%20rifle%20wintereinsatz.jpg

Yours

tom! ;)

Nickdfresh
10-22-2006, 05:08 AM
Great info here. I'm wondering about the production totals and of how common these weapons were. My guess is that they were fairly rare.

tom!
10-22-2006, 05:47 AM
Hi.

Type 94 37 mm rapid fire infantry gun:

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20typ%2094%20rapid%20fire%20gun.jpg

This gun was planned from 1933 on as replacement for the type Taisho 11 37 mm infantry gun. It should be used as infantry gun and anti-tank gun. Other specifications were low weight for easy handling, an armour shield and transport with a light towing vehicle or 4 horses.

The first prototypes were built in 1934 with rubber tires for high transport speed. During tests the tires were found very vulnerable for small arms fire so they were replaced by wodden or metal wheels with rubber band.

The gun worked semi-automatic making a maximum rof of 20 rpm possible, 15 rpm cyclic. The total weight was 327 kg. This was found acceptable. The 4 mm thick shield was often removed to spare the weight making the gun more mobile. Two hande bars could be attached on the lafette for man transport.

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20typ%2094%20ig%20zugstangen%20mannschaftszug. jpg

In 1936 the gun was first used in China. The 0,49 kg type 95 he-round was found useful against soft targets on ranges up to 5000 m. Due to the lack of armoured vehicles in the chinese forces the ap-abilities were not necessaryly needed.

Shooting range tests showed a problem with the early ap-round lowering the penetration ability to 20 mm/90° 350 m. In the mid-thirties additional research was made on this problem leading to a new projectile introduced around 1937 giving the gun a penetration ability of 40mm/90° on 300 mm and 25 mm/90° on 900 m.

The type 94 gun was also used in a modified version as type 95 37 mm tank gun on the type 95 light tank Ha-Go and the type 94 tk special tractors and the early type 97 tankettes Te-Ke.

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20typ%2094%20at-ig%20crewtraining.jpg

The Nomonham Incident showed the inefficiency against modern medium tanks as used by the Soviets. The high rof made the gun very useful against light ands medium field fortifications but due to the small caliber almost useless against heavyly fortified or concrete targets.

As the road transport speed was limited due to the wheels used a special transport carrier was developed in the late 1930´s. The gun was fixed on this carriage and then a road speed of up to 52 kph instead of 25 kph was possible.

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20typ%2094%20ig%20transporthaenger%20verlastet %202.jpg

A gun section with the type 94 rapid-fire infantry gun consisted of 11 men, leader, gunner 1 (giving direction), gunner 2 (directing gun), 2 loaders, 6 ammunition soldiers, also for close defence, and 1 driver. A gun platoon was two gun sections, section commander, 2 runners.

A Battalion anti-tank/infanry gun company consisted of two gun sections, company headquater ( Commander, 7 runners and orderlies, 1 NCO personnel administration, 1 NCO supply, 1 NCO arms and equipment, 2 medics), Ammunition platoon (commander, 20 NCO´s and men) and observation section (1 NCO, 6 men).

Yours

tom!

tom!
10-22-2006, 05:51 AM
Hi.


Great info here. I'm wondering about the production totals and of how common these weapons were. My guess is that they were fairly rare.

Some 400 were made. The japanese army realised early that the rifle wasn´t very efective compared to the relatively high weight. Nevertheless the production was never cancelled totally.

Yours

tom! ;)

Panzerknacker
10-22-2006, 12:12 PM
Very good info and pictures Tom, only a thing...


The type 97 ap-round wit a muzzle velocity of 865 m/sec could penetrate 30 mm/90° on 350 m and 20 mm/90° on 700 m. Additionally the type 98 20X141 mm he-round could be fired against soft targets like field fortifications etc.

The cartrigde used by the Type 97 wasnt 20x141 mm but 20x125 mm.

Ap shot.

http://img181.imageshack.us/img181/9267/20mmperfkl6.jpg


The larger 20x141 round belong to the Army AA cannon type 98.

http://www3.plala.or.jp/takihome/T98-20aa.jpg


And this is a Type 97 captured by the russians, it had the handlebars but no shield.

tom!
10-22-2006, 01:38 PM
Hi.

The 20X141 mm was the type 98 he-round.... hm.

Maybe the author meant the projectile of the type 98 he-round of the aa-gun, used with a 125mm cartridge. That would make more sense to me.

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20typ%2097%20at%20rifle%20zweiseiten%20skizze. jpg

Yours

tom! ;)

Panzerknacker
10-22-2006, 02:30 PM
Is probably that, because the cartrigde cases were NOT interchangeable.

-------------


Lunge Hollow Charge:

This was a semi-suicide weapon ( not intended as it but the close blast and fragmentation effect made it in that way)
A hollow charge mine was attached at the edge of the pole. Gripping the pole, stab it against tank and the mine is exploded.

http://www3.plala.or.jp/takihome/*****-mine.JPG

tom!
10-23-2006, 03:43 AM
Hi.

From the US TM 9-1985-4:

http://www.ww2technik.de/Bilderchen/japinfwaffen/pionier/jap%20selbstmord%20hohlladung.jpg

I renamed it with german designations.

from top:
- wooden handle
- safety pin
- shear wire
- connection cylinder
- striker
- threaded connecting ring
- detonator
- steel case
- explosive filling
- steel cone
- bottom plate
- legs

pull out safety pin, struck it against target, shear wire breaks, detonation

penetration: 130 mm


A similar construction with more chances to survive the explosion but only for lightly armoured vehicles and soft targets:

Suction-cup mine:

same source

http://www.ww2technik.de/Bilderchen/japinfwaffen/pionier/jap%20saugnapfsprengladung%20zeichnung.jpg

from top:
- pull igniters
- safety fuze
- blasting cap
- connecting sleeve
- primacord
- handle
- charge container
- cast explosive
- blasting cap
- suction cup

total length: 1800 mm
charge container: 135 mm X diameter 112,5 mm
charge weight: 2010 g
charge type: 53 % RDX, 47 % TNT

Two delay elements/primacords are used parallel to make sure the explosion happens.

suck mine against target, pull friction igniters, safety fuze delay time 10-15 sec, upper blasting caps detonate igniting primacord, lower blasting caps ignite explosive

edit:
Some of these devices were used during the December 1944 airbourne operations against US airstrips on Leyte and the Philippines

Yours

tom! ;)

Panzerknacker
10-23-2006, 05:01 PM
Intreresting this last one, I dont have any knowlegde of it, seems to be a "blast effect only" weapon, rather similar to the german Geballte ladung or the russian RPG-40. ¿ wich was their japanese designation?


More info I ve found in www.lonesentry.com (http://www.lonesentry.com).


LUNGE MINE

Perhaps the oddest of these antitank charges is the so-called "Lunge Mine" encountered on Leyte Island. This weapon—an armor-piercing charge on the end of a pole—derives its name from the way in which it must be thrust against the side of a tank in order to detonate.
The mine is an explosive-filled, sheet-steel cone, about 12 inches long and 8 inches in diameter at the base. As in all hollow charges, the cavity in the bottom of the cone tends to guide the force of the explosion out from the bottom of the cone and against the armor plate of the target. A metal sleeve extends from the top, or point end, of the cone and houses the simple firing device—a nail on the end of the broomstick-like handle which fits into the sleeve. The detonator is little more than an ordinary blasting cap set into the top of the cone, where the nail will strike the cap if the handle is jammed down in the sleeve. During transport, however, the handle is held immobile in the sleeve by a simple safety pin inserted through the sleeve and handle. A further safety feature is a thin holding pin, or shear wire, similarly installed through sleeve and handle. Three legs, 5 1/4 inches long, are attached to the bottom of the cone; the Japanese claim that these legs increase the penetrating power of the weapon. The penetrating effect of the charge is greater when the explosion occurs a few inches away from the armor.
http://www.lonesentry.com/articles/jp_tankhunters/fig1_japanese_lunge_mine_antitank.jpgThe Japanese suicide soldier will use the Lunge Mine as he would a rifle and bayonet, thrusting the three legs of the mine base against the side of the tank. The mine explodes on contact.


The Japanese suicide soldier has been taught to wield this weapon as he would a rifle and bayonet. The prescribed method of operation is for the soldier to remove the safety pin as he approaches the tank to be attacked, and to grasp the center of the handle with his left hand, and the butt end with his right. Then, holding the stick level, with the mine to the front, he lunges forward as in a bayonet attack, thrusting the three legs on the mine base against the side of the tank. The shock of contact will break the shear wire and the striker nail will be shoved into the detonator cap, thus exploding the mine as it is held against the armor. At this point the Jap soldier's mission ends for all time.
From experiments conducted in Manila, the Japanese claim that the 6 1/2 pounds of explosive in the mine is capable of penetrating 6 inches of armor, provided that the mine contacts the plate squarely. However, if contact is made at an angle of 60 degrees, the mine is reputed to penetrate 4 inches of armor. To date all attempts by the enemy to use the Lunge Mine against our tanks have met with failure.

PLT.SGT.BAKER
10-25-2006, 05:29 PM
Intreresting this last one, I dont have any knowlegde of it, seems to be a "blast effect only" weapon, rather similar to the german Geballte ladung or the russian RPG-40. ¿ wich was their japanese designation?


More info I ve found in www.lonesentry.com (http://www.lonesentry.com).


LUNGE MINE

Perhaps the oddest of these antitank charges is the so-called "Lunge Mine" encountered on Leyte Island. This weapon—an armor-piercing charge on the end of a pole—derives its name from the way in which it must be thrust against the side of a tank in order to detonate.
The mine is an explosive-filled, sheet-steel cone, about 12 inches long and 8 inches in diameter at the base. As in all hollow charges, the cavity in the bottom of the cone tends to guide the force of the explosion out from the bottom of the cone and against the armor plate of the target. A metal sleeve extends from the top, or point end, of the cone and houses the simple firing device—a nail on the end of the broomstick-like handle which fits into the sleeve. The detonator is little more than an ordinary blasting cap set into the top of the cone, where the nail will strike the cap if the handle is jammed down in the sleeve. During transport, however, the handle is held immobile in the sleeve by a simple safety pin inserted through the sleeve and handle. A further safety feature is a thin holding pin, or shear wire, similarly installed through sleeve and handle. Three legs, 5 1/4 inches long, are attached to the bottom of the cone; the Japanese claim that these legs increase the penetrating power of the weapon. The penetrating effect of the charge is greater when the explosion occurs a few inches away from the armor.
http://www.lonesentry.com/articles/jp_tankhunters/fig1_japanese_lunge_mine_antitank.jpgThe Japanese suicide soldier will use the Lunge Mine as he would a rifle and bayonet, thrusting the three legs of the mine base against the side of the tank. The mine explodes on contact.


The Japanese suicide soldier has been taught to wield this weapon as he would a rifle and bayonet. The prescribed method of operation is for the soldier to remove the safety pin as he approaches the tank to be attacked, and to grasp the center of the handle with his left hand, and the butt end with his right. Then, holding the stick level, with the mine to the front, he lunges forward as in a bayonet attack, thrusting the three legs on the mine base against the side of the tank. The shock of contact will break the shear wire and the striker nail will be shoved into the detonator cap, thus exploding the mine as it is held against the armor. At this point the Jap soldier's mission ends for all time.
From experiments conducted in Manila, the Japanese claim that the 6 1/2 pounds of explosive in the mine is capable of penetrating 6 inches of armor, provided that the mine contacts the plate squarely. However, if contact is made at an angle of 60 degrees, the mine is reputed to penetrate 4 inches of armor. To date all attempts by the enemy to use the Lunge Mine against our tanks have met with failure.


I seem to recall the japs using this weapon in MOH Rising Sun.

Panzerknacker
10-25-2006, 07:53 PM
Type 99 AT Mine

This AT mine was thrown to the tank, or attached by its magnets. Four black boxes around the mine are magnets. One Type 99 AT Mine could destroy a 20 mm thick armor and two piled mines could destroy a 30 mm thick armor. Similar in use as the german hafthohlladung but without the benefit of the shaped charge.

http://www3.plala.or.jp/takihome/AT-mine.JPG


Size : 120 mm (diameter) x 38 mm (thickness) Weight : 1.25 kg Explosive : TNT 680 g

tom!
10-28-2006, 02:20 PM
Hi.

http://www.ww2technik.de/Bilderchen/japinfwaffen/pionier/jap%20typ%2099%20at%20haftmine%20zeichnung.jpg

from top left:
- safety pin
- compression spring
- percussion cap
- Locking balls
- delay pellet
- striker
- detonator
- explosive
- canvas cover
- magnets


Description:

The mine resembles a canvas cloth bag, disk shaped, with a snap-fastened flap on the outer edge for inserting the eight blocks of explosive (cast mixture of 50-50 RDX-TNT). Opposite the filling flap on the outer edge of the mine is a metal adaper which is externally threaded to receive the fuze. Four equally spaced permanent magnets are attached by khaki webbing to the outer edge of the mine body.

The mine is packed two to a wooden box complete with wooden shipping plugs in in the fuze adapters. The fuzes are enclosed in tubular metal cases sealed with a paper band and tear string. For carrying on the field, the mines are packed individually ina khaki-colored cloth pouch.

http://www.ww2technik.de/Bilderchen/japinfwaffen/pionier/jap%20typ%2099%20panzermine%20Transporttasche.jpg

The fuze contains two springs, a compresion spring and a firing pin spring, the latter of which is contained in a firing pin sleve. Four steel retaining balls fit into holes in the firing pin sleve and notches in the firing pin, retaining the position of the firing pin.
A fuze cap provides a base for the first spring and is grooved on the inside about one-third of the way up from its base.
There is a safety pin which passes through the fuze body just below the base of the safety cap and between the striker and the percussion cap.
The powder relay train threads into the base of the fuze body, and the detonator tube threads over the base of the delay train container.

Operation:
The fuze is carried separately and is secured to the mine by a locking ring. In use the safety pin is pulled, the fuze cap given a sharp rap, and the mine either placed on or tossed on armour plate within a range of ten feet.
When the fuze cap is forced downward against the compression spring, its groove aligns with the retaining balls. The tension of the firing pin spring forces the retaining balls into this groove and also forces the striker down onto the percussion cap.

Test detonations of this mine indicate a distinct "Munroe-Effect" at the junction of the inner edges of the explosive blocks.

http://www.ww2technik.de/Bilderchen/japinfwaffen/pionier/jap%20typ%2099%20panzermine%20mit%20zuender.jpg

There were some tests with a similar mine type with ring-mounted explosive filing leaving a central hole increasing the Munroe-Effect. The magnets were placed on the canvas cover not on the edges of the mine. Development was ceased in 1941 as the penetration was only 35 mm.

Yours

tom! ;)

Panzerknacker
10-28-2006, 03:48 PM
Very nice, you always seems to have very good pictures of this devices, thanks. :rolleyes:

tom!
10-29-2006, 04:43 AM
Hi.

I´m studying the japanese military of ww2 for 4 years now and I digged out some very interesting facts and especially pics.

Type Ra 37 mm at-gun:

From 1936 on the japanese army captured a number of german 3,7 cm Pak Rheinmetall (official designation, 35 or 35/36 is a post-war addition) in China and in various border incidents between Manshuria and Mongolia/Soviet Union. As this gun was far superiour to the japanese guns and with a relatively low weight the gun was introduced officially.

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20typ%2097%20Ra%2037%20mm%20AT.jpg

The guns were equipped with japanese optics. To increase mobility a small guidance wheel could be attached to the trails. Additionally the gun shield (120 kg) was often removed by the troops to lower the weight.

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20typ%2097%2037%20mm%20pak%20hilfsrad.jpg

The ammunition was copied from the rounds captured and had a similar effect.

The gun was used in China and also on Guadalcanal and replaced the type 94 rapid-fire infantry gun in regimental at-companies.


type 1 37 mm at-gun:

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20type1%2037%20mm%20ATG.jpg

After capturing the type Ra at-guns the type 94 rapid-fire infantry gun was reworked using design elements of the captured guns. In a first step the chamber volume was increased to increase the propellant weight and thus to increase the muzzle velocity. The tests showed an increase in penetration but the total penetration ability was still unsatisfactorily and due to the heavier recoil an enlarged recoil mechanism was necessary increasing the weight of the gun unacceptable.

Nevertheless the army decided to mount the improved barrel on the mounting of the type 95 37 mm tank gun and introduced it as type 98 37 mm tank gun with a penetration ability of 25 mm/90° on 500 m. This gun was used on type 95 light tank Ha-Go, type 94 tk special tractor, type 97 tankette Te-Ke, type 98 light tank Ke-Ni and type 97 command tank Shi-Ki (mounted in the bow).

In a side development for the tank troops the chamber walls were strengthened to allow the use of a propellant with higher energy. This gun was named type 100 37 mm tank gun. As the penetration was only increased slightly to 26 mm/90° on 500m only few guns were produced and used on the type 95 light tank Ha-Go and the early type 2 amphibious tank Ka-Mi.

As the Nomonhan-Incident in 1939 showed the at-abilities of the japanese forces were weak the decision was made to increase the maximum allowed weight for a light at-gun. So the type 100 gun was reworked. The breech was remodelled and the barrel length was extended from L/36,7 to L/45,9 (some sources mentions L/50). This lead to a significant increase of the armour penetration to 44 mm/90° on 500m. On the other hand the weight increase could be limited to 27 kg compared to the type 94 37 mm infantry gun using lighter materials.

The gun was introduced as type 1 37 mm at-gun in 1941. The total production numer is unknown. It replaced the type 94 37 mm rapid-fire infantry gun in the regimental at-companies.

http://www.ww2technik.de/Bilderchen/jappanzer/waffen/jap%20typ%2098%20ke-ni%20bewaffnung%20testanordnung.jpg
type 1 37 mm tank gun and coaxial type 97 7,7 mm tank machine gun in the gun mount used with the type 98 and type 2 light tanks (mounted on a carriage for tests)

The same barrel was introduced on a slightly reworked mount of the type 100 tank gun as type 1 37 mm tank gun, too, replacing its predecessors. The type 1 37 mm tank gun was used on the type 95 light tank Ha-Go, the type 97 tankette Te-Ke, the type 98 light tank Ke-Ni, the type 2 light tank Ke-To, the type 2 amphibious tank Ka-Mi and on the type 5 tank prototype Chi-Ri (bow-mount).

Yours

tom!

tom!
10-30-2006, 06:45 AM
Hi.

Type 1 47 mm at-gun:

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20type%201%2047%20mm%20ATG.jpg

In 1938 the japanese Kwantung Army captured some soviet 45 mm at-guns. The Army Technical Bureau started some intense testing. The gun was found superiour to all own models and as it was based on the already introduced type Ra 37 mm gun (it was in fact an upgunned version of the 3,7 cm Pak Rheinmetall) the decision was made to start the development of a similar weapon with a caliber of 47 mm.

There were two large handicaps slowing down the development:

1. The Army High Command saw no use for such a gun
Therefore the development was seen as "basic research" and not supported properly
2. The main requirement for all infantry support weapons was a weight limit to allow easy transport of the weapon by the crew.
Even the type Ra at-gun reached the limit and so an equilibrium had to be found between weight and effectiveness lowering the ap-abilities of the first test guns noticeably.

With the devastating results of the Nomonhan-Incident in 1939 showing a lack of Antitank defense ability of the infantry the weight limit was dropped and the development of the 47 mm at-gun was fastened . In September 1939 the production and testing of the final construction started.

The gun was in general an enlarged version of the type 94 rapid-fire infantry gun using the same breech type and firing mechanism. Two tires allowed a maximum transport speed of 50 kph. The shield was mounted angled. With a total weight of 750 kg the gun was too heavy for crew transport and the penetration of 50 mm/90° on 500 m was compareable to at-guns of other countries of that time.

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20typ%201%2047%20mm%20pak%20oberlafette%20colo ur.jpg

Production started in Spring 1941 at the Osaka Army Arsenal which tested all guns and supervised allmost all artillery and at-gun production for the japanese Army.

The guns were used in the regimental at-companies.

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20typ%201%2047mm%20pak%20colour.jpg

During 1942 the few guns produced were found useful against the lightly armoured allied vehicles and light tanks but useless against the Mathilda II. After the US Medium M4 reached the battlefields the guns became almost totally useless.

Additional ammunition research lead to an increased penetration of 45 mm/90° on 700 m but the frontral armour of the Sherman still could only be penetrated below 50 m and the side armour below 250 m.

Some 2300 guns were produced and used until the end.

The gun was also mounted on an enlarged gun mount of the type 98 37 mm tank gun and introduced as type 1 47 mm tank gun. This gun was used with the type 97 medium tank Shinhoto Chi-Ha, type 98 experimental medium tank Chi-Ho, type 1 medium tank Chi-He, type 3 amphibious tank Ka-Chi, and type 5 experimental amphibious tank Ka-To in bow-mount.

http://www.ww2technik.de/Bilderchen/jappanzer/waffen/jap%20typ%201%2047%20mm%20panzerkanone.jpg

Yours

tom!

Panzerknacker
10-30-2006, 04:31 PM
This 47 mm weapon was the most close that the japanese have to a decent Antitank weapon, still weak.

Very good Information as usual Tom. :cool:

Type 2 AT Rifle Grenade

In 1942, a new AT grenade was bought by a disguised merchant vessel to Japan from Germany. It was a hollow charge grenade and a gift to Hirohito from Hitler.
In AT grenade, there were two kinds of caliber, 40 mm and 30mm. The inner barrel of the grenade launcher was rifled and that rifling was reproduced in the rear of the grenades to give the spin stabilization.

Though it was officially anounced that it can destoy a 40 mm thick armor, actually it was almost useless againt Allied medium tanks.

http://www3.plala.or.jp/takihome/ta-te.JPG

tom!
11-01-2006, 08:11 AM
Hi.

40 mm hollow-charge rifle grenade:

http://www.ww2technik.de/Bilderchen/japinfwaffen/gewehrgranaten/jap%2040%20mm%20hohlladungsgewehrgranate%20zeichnu ng.jpg
http://www.ww2technik.de/Bilderchen/japinfwaffen/gewehrgranaten/jap%20gewehrgranatenaufschlagzuender%20zeichnung.j pg
impact fuze

from top:
- booster
- detonator
- creep spring
- clock spring
- striker
- arming sleeve
- striker carrier
- arming spring

data:
over-all length: 202,7 mm
maximum diameter: 40,2 mm
total weight: 353 g
filling: 50/50 RDX/TNT
weight of filling: 108 g

description:
This grenade is a copy of the german "große Gewehrpanzergranate" and is fired from a cup launcher attached to the standard 6,5 mm rifle.
The body is cylindrical with a semiconical shaped head. It is made in two parts threaded together and fitted with a ballistic cap and cone to give the kollow-charge effect. The forward part contains the explosive charge cast around the cone. The after part which is made of aluminium had a rifled collar near the base and contains the fuze ans explosive train.
The fuze is held in by a base plate with a protruding spigot which is screwed into the base of the grenade. The fuze is held in position by the spigot. The needle firing pin is secured in a housing that has four stirrup-like springs protruding from the side. Around the housing is a setback spring held in by an arming sleeve which has two sets of grooves notched on the inner side. Holding the firing pin stationary is a coil clock spring which is held in by the arming sleeve. There is also a creep spring between the firing pin and the detonator.
The propellimg charge consists of a special cartridge with a wooden bullet.

operation:
On firing, the setback causes the arming sleeve to move down and it is held down by the stirrup springs which engage in the groove in the arming sleeve. Centrifugal force then causes the clock spring to expand and the fuze is armed. On impact the firing pin housing overcomes the creep spring and moves onto the flash cap setting off the detonator and booster

The 40 mm rifle grenade was also used in CBUs as type 2 1/2 kg hollow-charge bomblett with a diferent fuze and an attached fin.


30 mm hollow-charge rifle grenade:

http://www.ww2technik.de/Bilderchen/japinfwaffen/gewehrgranaten/jap%20typ%202%2030%20mm%20hohlladungsgewehrgranate .jpg

data:
overall length: 158,6 mm
maximum diameter: 29,97 mm
total weight: 233,89 g
filling: 50/50 RDX/TNT
weight of filling: 49,6 g

description:
The explosive head of the 30 mm grenade is of the same type construction as that of the 40 mm grenade, but on a smaller scale. The spigots of both grenade types are identical with the exeption of the threads on their forward ends. Both grenades use the same fuze

operation:
The operation of the 30 mm grenade is identical to that of the 40 nn grenade.


Both rifle grenades were fired by the type 2 cup-type rifle grenade launcher, see next post (due to limitation of pictures per post).

http://www.ww2technik.de/Bilderchen/japinfwaffen/gewehrgranaten/jap%20typ%202%20gewehrgranatwerfer%20montiert.jpg


By the way, the pic panzerknacker posted in his last post shows two versions of an experimental 45 mm hollow-charge rifle grenade and on the right the final version of this grenade for the type 2 launcher


Yours

tom!

tom!
11-01-2006, 08:25 AM
Hi.

Type 2 rifle grenade launcher:

http://www.ww2technik.de/Bilderchen/japinfwaffen/gewehrgranaten/jap%20typ%202%20gewehrgranatgeraet%203.jpg

The type 2 grenade launcher is a copy of the german "Schiessbecher". Examples of the German Schiessbecher and its antitank (hollow-charge) grenades were delivered to Japan by blockade breaker. Two blockade breakers with identical cargos were sent to Japan to improve the odds of the mission’s success. The blockade breaker Tannenfels arrived in Japan first, on 12 May 1942. By August of 1942, the Type 2 and its hollow-charge grenades were being produced, and some examples had reached Guadalcanal by October of 1942. Production of the Type 2 grenade launcher was halted in 1943. Approximately 49,000 Type 2 grenade launchers were produced from 1942 to 1943. This figure is very small when compared to the more than 1.4 million Schiessbecher that were delivered to German troops from 1942 to 1944.

http://www.ww2technik.de/Bilderchen/japinfwaffen/gewehrgranaten/jap%20typ%202%20gewehrgranatgeraet%20color%20befes tigung%20offen.jpg

All known examples of the Type 2 grenade launcher were made by the Chigusa factory of the Nagoya Army Arsenal. The Type 2 was used with the Type 38 6,5 mm or Type 99 7,7 mm rifle.
The physical characteristics of this launcher remained stable throughout its short production period; however, variations in the launcher’s markings have been identified. Early launchers were dated using the Showa era, and later launchers were dated using a secret code.

http://www.ww2technik.de/Bilderchen/japinfwaffen/gewehrgranaten/jap%20typ%202%20gewehrgranatwerfer%202.jpg


Two hollow-charge grenades were used with the Type 2 grenade launcher--a 30 mm version and a 40 mm version. Two types of launching cartridges were used; one had a wooden bullet, and the other had a crimped case mouth. The Type 2 grenade launcher was issued with a canvas carrying pouch, barrel wrench, and canvas pouch for carrying 10 rifle grenades.

http://www.ww2technik.de/Bilderchen/japinfwaffen/gewehrgranaten/jap%20typ%202%20gewehrgranatgeraet%20color%20einbl ick%20abschussrohr.jpg

Yours

tom!

tom!
11-01-2006, 01:20 PM
Hi.

experimental 57 mm at-gun:

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20exp%2057%20mm%20ATG.jpg

Realising that the type 1 47 mm at-gun will not be capable of destroying the newer allied tank designs the japanese Army started the development of a 57 mm version in April 1941. The gun should also be used as main armament of the succesor of the type 1 medium tank Chi-He.

The type 1 at gun was enlarged to cope with the higher recoil forces of the 57 mm gun. This increased the weight to 1600 kg which was indicutably high. All tries to lower the weight meant to lower the penetration ability. The last design could only penetrate 60 mm/90° on 1000m at a weight of 1540 kg.

The japanese Army had to realize that a good at-gun-design would be too heavy to be used with the actual infantry doctrine. The development was stopped in 1943 and the capacities were used to design a mobile, self-propelled at-weapon.


experimental 37 mm at-gun Raku:

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20exp%2037mm%20ATG%20raku.jpg

In early 1942 the japanese Army started this project based on the type 1 37 mm at-gun for the planned airbourne regiments. The main task was to develop a lighter and smaller gun with the same penetration ability as the type 1 at-gun. The gun should be disassembleable to be packed into two containers which should be dropped from transport aircraft.

http://www.ww2technik.de/Bilderchen/japinfwaffen/infanteriegeschuetze/jap%20typ%2092%20battalionsgeschuetz%20proto%20luf tlande%20lasten.jpg

The wheels were redesigned with stabilising metal circles. Using a small box carriage and a smaller shield the total weight could be lowered to 243 kg. The efficiency was compareable to the type 1 at-gun but this weapon was found too weak to get used in further battles.

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20exp%2037mm%20ATG%20raku%203.jpg

The design was cancelled in 1943.

Yours

tom!

Panzerknacker
11-01-2006, 06:23 PM
Very good, I have no idea of the experimental 57 mm gun, look rather similar to the british 6 pounder.

Nickdfresh
11-02-2006, 03:39 PM
Very good info Tom...

tom!
11-03-2006, 03:47 PM
Hi.

Type 4 70 mm rocket launcher:

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20exp%2070%20mm%20raketenpanzerbuechse.jpg

In early 1943 the japanese Army was able to capture some US 60 mm Bazookas. As these weapons were extremely light and had a larger penetration ability than most japanese at-guns the decision was made to develop a similar weapon.

In late 1943 design data of the german Raketenpanzerbüchse 54 were delivered to Japan speeding up the own development. In early 1944 the 70 mm rocket launcher (exact caliber 72 mm) was tested at the Osaka Army Arsenal.

To minimize the transport size the launcher could be disassembled into two parts. The firing mechanism was copied from the US Bazooka. A bipod could be attached to the 1500 mm long barrel. Total weight was 8 kg.

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20exp%2070%20mm%20raketenpanzerbuechse%202.jpg

The rocket propelled grenade had a total length of 359 mm and was projectile-shaped with small fins giving a rotation to stabilize the flight. Muzzle velocity was 160 m/s with a propellant weight of 260 g and a burntime of 0,4 sec.

Minimum range was 50 m to arm the fuze which was armed after few rotations. The maximum range was 800 m, maximum effective range 100m with a hit accuracy of 60%. The penetration ability of the hollow-charge warheads with an explosive weight of 700g was 80 mm. The inmpact fuze only worked in hit angles between 90° and 60°. Below 60° the warhead didn´t detonate.

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20typ%204%2070%20mm%20raketenpanzerbuechse%203 .jpg

The two-men-crew consists of gunner and loader. An experienced crew could reach a rof of 6 rpm. A total of 3300 type 4 rocket launchers were produced at Ogura and Osaka Army Arsenals from July, 1944. All were given to units preparing for the homeland defence, non were used outside Japan.


experimental 90 mm rocket launcher:

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20exp%2090%20mm%20raketenpanzerbuechse.jpg

As the penetration ability of 80 mm was found too weak in early 1944 an enlarged version was ordered. In late 1944 a test version with a barrel length of 1500 mm was produced and tested. A third leg was attached behind the trigger element to increase stability during firing. With a total weight of 12 kg a 8,6 kg rocket propelled grenade could be fired. With a propellant weight of 620 g, giving a muzzle velocity of 106 m/s, the warhead, filled with 1,6 kg explosive, was able to penetrate 120 mm on 100 m. A short version with a 1200 mm long barrel was developed for the airbourne units. There is no report of a serial production.

Yours

tom!

tom!
11-05-2006, 08:11 AM
Hi.

type 5 (experimental) 45 mm recoilless rifle:

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20typ%205%2045%20mm%20rueckstossfreie%20panzer abwehrkanone.jpg

In late 1944 the decision was made to develop a short-range infantry anti-tank weapon based on the german Panzerfaust but reloadable. This weapon should be light with a hollow-charge warhead giving a minimum penetration of 120 mm.

In 1945 three test versions with different position of the firing mechanism and different barrel diameter were built. All had a conical extension with a length of 380 mm at the rear end to minimize the recoil. All used an experimental grenade with a length of 800 mm, 2,3 kg weight, propellant charge of 35 g and an explosive weight of 500g.

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20typ%205%2045%20mm%20rueckstossfr%20pzabwk%20 version2.jpg

Version 1 had a barrel length of 600 mm and. With a barrel diameter of 45 mm the maximum penetration was 100 mm.

Version 2 had a barrel length of 1000 mm. With a diameter of 57 mm the maximum penetration was 110 mm.

Version 3 had a barrel length of 1000 mm. With a diameter of 45 mm the maximum penetration was 110 mm.

The decision was made to continue development of version 3. The final version had a weight of 6,4 kg, a barrel lenght of 1000 mm and the 380 mm long conical rear extension.

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20typ%205%2045%20mm%20rueckstossfreie%20panzer abwehrkanone%202.jpg

Different types of rocket propelled grenades were tested with propellant charges of between 30 g and 100 g. The explosive weight was increased to 625 g, the total weight was still 2,3 kg.

The final version had total lenght of 850 mm with a propellant part of 180 mm length, a propellant weight of 100 g, a 520 mm guidance stick with an impact fuze on top and a warheas of 150 mm with an explosive weight of 625 g. Muzzle velocity was 40 m/sec., minimum range 50 m, maximum range 150 m, penetration 120 mm.

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20typ%205%2045%20mm%20rueckstossfr%20pzabwk%20 granate.jpg

Yours

tom!

Panzerknacker
11-05-2006, 11:42 AM
Beatiful.

Checking the last picture of the hollow charge grenade I think the japs should give more lenght between the end of the copper cone and the grenade head, the hollow charge need more espace between the charge and the armor to made the best use of the fire jet.

tom!
11-06-2006, 06:30 AM
Hi.

experimental tank hunter studies:

As effective at-guns would be too heavy to be used with the standard infantry doctrine some designs were started to increase mobility of larger caliber guns.

light anti-tank gun carrier So-To:

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20lt%20armored%20ATGcarrier%20so-to%202.jpg

1939 gun carrier study bassed on the type 95 light tank Ha-Go. The gun could be attached on top of the closed fighting compartment. The carrier was planned for the type 94 37 mm infantry gun/type 1 37 mm at-gun and the type 1 47 mm at-gun


47 mm tank hunter study:

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20projekt%20typ%2097%20Te-Ke%20typ%201%2047%20mm%20pak%20zeichnung.jpg

A tank hunter based on the type 94 tk special tractor with gun firing to the back. The fighting compartment is open to the top and back.


type 5 experimental 47 mm tank hunter Ho-Ru

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20experimental%2047mm%20atg%20sfl%20ho-ru%20auf%20typ%203%20ke-ri.jpg

Experimental tank design based on the type 3 light tank Ke-Ri with closed fighting compartment similar to the german Sturmgeschütze. The design was abandonned just before the prototype production should be started as the 47 mm at-gun was found too weak and the type 5 75 mm tank hunter Na-To became ready for serial production.

Yours

tom! ;)

tom!
11-06-2006, 10:09 AM
Hi.

Type 5 tank hunter Na-To:

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20typ%205%2075%20mm%20panzerjaeger%20na-to%20rechts%20vorn.jpg

In 1943 the decision was made to develop a tank gun based on the type 4 75 mm aa-gun which became operational in early 1944.

For this gun a special gun carrier should also be developed, based on the chassis of a newly designed full-tracked heavy transport vehicle using a remodelled chassis of the type 4 experimental tank Chi-To.

A prototype was built in April, 1944. The engine of this vehicle was placed in the bow. The engine room and the driver cabin for the driver and the wireless operator were armoured with welded 12 mm thick armour plates.
Behind the driver´s cabin the type 4 75 mm tank gun should be placed on a special pivot mount. A 12 mm gun shield should covered the 5-men gun crew from infantry ap-rounds, but only from the front. The chassis was tested in summer 1944 showing a large vulnerability of the gun crew regarding infantry fire from the sides. This was solved by installing two aditional side armour plates on both sides of the gun mount.

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20typ%205%2075%20mm%20panzerjaeger%20na-to%20hinten.jpg

The gun prototype was also tested in Summer 1944 showing multiple problems with stability and recoil mechanism making a major redesign necessary. This redesign was done in early 1945. Now there were additional problems with the gun mounts of the type 4 tanks but as the guns on the Na-To were mounted on a pivot there was no problem for the use on the tank hunter.

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20typ%205%2075%20mm%20gun%20na-to%203.jpg

The completed vehicles were tested in spring 1945 showing a good mobility and cross-county ability. The gun was able to penetrate the US medium M4 on ranges over 1000 m making the vehicle a dangerous weapon. In May, 1945, a couple of type 5 75 mm tank hunter Na-To were sent to northern China for battlefield tests. It is possible that these vehicles were destroyed during the soviet attack in August, 1945 but all documents egarding these late-war developments were destroyed after the japanese surrender.

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20typ%205%20Na-to%20trials%202.jpg

data:

manufacturer: Osaka Rikugun Zoheisho (Osaka Army Arsenal)
number of vehicles built: total number unknown, but > 10
total weight: 15 t
crew: 7 men
maximum armour strength: 12 mm
length: 5800 mm
width: 2400 mm
height: 2750 mm
engine: Mitsubishi 8 cylinder gasoline engine
power: 165 hp bei 2000 rpm
maximum speed: 40 km/h
power-weight-ratio: 11 hp/t
armament: 1 X Typ 5 75 mm gun

Yours

tom!

tom!
11-07-2006, 09:17 AM
Hi.

Now the real heavy things:

Part 1:

From early 1943 a heavy 105 mm tank gun was developed based on an experimental 105 mm heavy artillery gun, a remodelled type 92 105 mm gun. The development was made quickly and with only few problems to solve the design was tested in spring 1944. The tests were done successfully and so in summer 1944 a 105 mm tank gun was ready for service but there was no idea how to use this gun. Due to the weight of more than 5 t and a total length of more than 7 m no actual tank or tank design was able to carry this gun.

http://www.ww2technik.de/Bilderchen/jappanzer/waffen/jap%20exp%20typ%205%20105%20mm%20kanone%20links.jp g

data:
caliber: 104,9 mm
barrel length: 4720 mm
muzzle velocity: 900 m/sec
grooves: 32
spin direction: right
ammunition:
projectile: 16 kg
propellant charge: 30 kg
penetration: 150 mm/90° on 1000 m

http://www.ww2technik.de/Bilderchen/jappanzer/waffen/jap%20exp%20typ%205%20105%20mm%20kanone%20abschuss .jpg
gun immediately after firing


This lead to a redesign of the turret planned for the super-heavy tank project named O-I. Additionally studies were started to develop a turret for the planned type 5 tank Chi-Ri. Due to a massive lack of resources none of these projects could be finished until mid 1945 and so an interim solution was designed, the

experimental 105 mm tank hunter Ka-To:

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20exp%20105%20mm%20Panzerjaeger%20ka-To%20seite%20skizze.jpg

This vehicle was based on the design of the type 5 experimental tank Chi-Ri. The planned total weight was about 30 t. The superstructure was similar to the one from the Na-to but had a maximum armour strength of 25 mm. The wireless operator was removed making a smaler driver´s cabin possible. This should give the Ka-To a maximum traverse of + - 45°. The gun was mounted on a pivot lafette and equipped with an armoured housing, only open to the back. Frontal armour was 25 mm, side armour 20 mm, top armour 12 mm.

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20exp%20105%20mm%20panzerjaeger%20ka-to%203d.jpg

At the end of the war the design was almost ready for the prototype stage. Most detail documents were destroyed.

planned data:

total weight: 30 t
crew: 6 men
maximum armour strength: 25 mm
length: 7390 mm
width: 2850 mm
height: 2850 mm
engine: Mitsubishi Diesel engine
power: 400 hp
maximum speed: 40 km/h
armament: 1 X Typ 5 105 mm tank gun

Yours

tom!

tom!
11-08-2006, 07:29 AM
Hi.

Part 2:

Heavy tank destroyer Ho-Ri:

The japanese Army payed a lot attention on the german heavy Panzerjäger like Ferdinand/Elefant, Jagdpanther and also Jagdtiger. Having a gun with a penetration ability like the german 8,8 cm Pak 43/3 and a chassis for tank weights of up to 45 t the decission was made to build a similar tank destroyer. The design started after the chassis of the type 5 experimental tank Chi-Ri became ready for service in early 1945. In the first stage two different designs were made:

Ho-Ri I:

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20105%20mm%20panzerjaeger%20Ho-Ri%20I.jpg

Using chassis and superstructure of the type 5 tank the engine should be placed in the middle of the vehicle. The gun should be placed in a heavily armoured casemate in the back of the vehicle. The planned armour thickness of the casemate was 150 mm frontal and 100 mm on the sides and back.
For close defence the standard bow armament of the type 5 tank should be used, a type 1 37 mm tank gun with a coaxial type 97 7,7 mm tank machine gun. Additionally machine gun mounts in the sides and the back of the casemate were planned.

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20typ%205%20ho-ri%20I%203d.jpg



Ho-Ri II

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20105%20mm%20panzerjaeger%20Ho-Ri%20II.jpg

Also using chassis and superstructure of the type 5 tank the tank gun should be placed in a casemate installed instead of the tank turret. Armour strenth of the casemate should be the ame as on the Ho-Ri I. For close defence a machine gun should be mounted in the bow and a type 98 2 0 mm aa-machine gun should be mounted next to the commanders cupola. Some changes were made just before the designs should be presented to the Army High Command. The casemate had been simplified for faster building and the type 1 37 mm tank gun was added to the bow machine gun again. On the other hand the aa-machine gun was removed and additional machine gun mounts were added.

http://www.ww2technik.de/Bilderchen/jappak/fahrzeuge/jap%20typ%205%20ho-ri%20II%203d.jpg



The Army decided to develop the Ho-Ri I design and a type 4 20 mm aa-gun twin mount was added to the casemate top. Until surrender only early development stages were finished. Prototype manufacturing was planned for December, 1945.


planned data:

total weight: 40 t
crew: 6 men
maximum armour strength: 150 mm
length: 7400 mm
width: 3050 mm
height: 2700 mm
engine: licence built BMW 12-cylinder gasoline aircraft engine
power: 550 hp
maximum speed: 40 km/h
armament:
1 X Typ 5 105 mm tank gun (60 rounds)
1 X type 1 37 mm tank gun (100 rounds)
1 X type 4 20 mm twin aa-machine-gun (480 rounds)
2 X type 97 7,7 mm machine gun (4980 rounds)

Yours

tom!

tom!
11-10-2006, 06:08 AM
Hi.

Type 93 multi-purpose mine:

http://www.ww2technik.de/Bilderchen/japinfwaffen/pionier/jap%20typ%2093%20at%20ap%20mine%20zeichnung.jpg

From top left:

- safety washer
- brass cap
- washer
- safety cap
- brass dome
- shear wire
- spring
- main filling
- striker
- percussion cap
- detonator
- booster

Data:
diameter: 171,5 mm
over-all height: 44,5 mm
weight: 1360 g
explosive weight: 900 g
type of explosive: Picric Acid

Description:
The mine is circular with a slightly domed top and flat bottom. It is constructed of an upper and lower section of sheet metal secured together by four heavy corrugatuions in the walls which serve as threads. The overlap of the walls of the two sections is sealed with a bituninous paint. The interiour of the container is painted with a black enamel to secure the metal from the corrosive effects of the Picric Acid. The explosive is inserted as solid ring main charge of cast Picric Acid with an inner booster of pressed powdered Picric Acid containing a 16 mm diameter central hole to house the fuze. The explosive is completely covered by a layer of paper, shellacked to the explosive and waxed externally.
Soldered on the inside of the lower mine section is a brass disc, 39,7 mm in diameter, having a threaded collar for the insertion of the fuze.
The central hole in the upper section is reinforces with a brass collar threaded to receive the brass plug. A thin leather washer fits between the brass plug and the collar to seal the mine.
Two brass rings are fastened to two opposite sides of the upper section by means of a soldered metal strip. Drag ropes may be fastened to the rings.
The fuze assemby consists of a striker held under spring pressure by a shear wire, a percussion cap, a primary detonator, and a larger secondary detonator all incorporated in the fuze body which is threaded on the lower end to srew into the collar in the bottom of the mine. A safety cap is screwed into the upper end of the striker until the mine is laid. An additional safety feature is a brass cylinder with attached washer which fits over the brass safety cap and rests on top of the fuze body, the washer fitting under the leather washer of the brass plug.
The mine is painted olive-drab with a narrow red ring around the brass plug.

Employment:
Antipersonnel and antitank
The Japanese have two sizes of shear wire for this mine. One for antipersonnel use shears at 32 kg, the other, for antitank use shears at 1135 kg. These mines have been found burried upside down with additional explosives placed beneath them to increase their effect. The A/P fuze has a black upper body

Operation:
With the safety devices removed any load on the cover of the mine causes the brass plug to press down the striker. If the prssure is sufficient, the shear pin is sheared. This frees the striker which, under pressure of the spring, strikes the percussion cap initiating the detonating system.



provisional Panzerfaust:

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20behelfspanzerfaust%20zeichnung.jpg

In 1944 investigations were made by the Army Headquater if a serial production of the german Panzerfaust 100 is possible. Due to the lack of raw materials and industrial ressources a production seemed impossible.

In early1945 guidelines for the defence departments of all prefectures were published how to built weapons for militia units using natural materials. Under these guidelines was one concerning the development and production of Panzerfaust-type at-weapons.

for the barrel bamboo should be used. The inner walls should be drilled out, in order to receive a continuous pipe of about 950 mm. A basket made of bamboo fibers installed at the front end should increase accuracy.

The grenade should be made of a bamboo shaft with a diameter, which had to fit into the bamboo launcher tube, and an up to 300 mm long hollow-charge warhead made of wood or sheet metal usind a steel or copper cone. The propellant charge should have a weight of between 30 and 40 g, the weight of the explosive filling should not exceed 1 kg.

http://www.ww2technik.de/Bilderchen/jappak/sonstiges/jap%20behelfspanzerfaust%20gefechtskopf%20zeichnun g.jpg

A penetration of 100 mm should be reached in trials. The weapons should be manufactured by local factories and craftsmen.

I do´t know if there was any serial production.

Yours

tom!

tom!
11-12-2006, 06:22 AM
Hi.

Type 3 multi-purpose mine:

type 3 mark a:

http://www.ww2technik.de/Bilderchen/japinfwaffen/pionier/jap%20typ%203%20a%20terracotta%20at%20ap%20mine%20 zeichnung.jpg

from top left:

- safety pin
- hammer release fork
- cover
- hammer spring
- striker
- percussion hammer
- striker holder
- plunger
- fuze body
- plunger spring
- gaine
- fuze seat
- rubber explosive container
- mine wall

Data:

mark a:
diameter: 218,5 mm
total height: 157,5 mm
length of fuze: 63,5 mm
material of mine wall: terracotta
thickness of wall: 11,2 mm
total weight: 5140 g
weight of explosive: 2000 g
color: brown
explosive: type 88 (75 % Ammonium Perchlorate, 16 % Ferrosilicate, 6 % wood pulp, 3 % heavy oil)
detonator charge: 50 % Ammonium Nitrate, 50 % TNT
or 90 % Ammonium Nitrate, 10 % Dinitronaphtalene

Description:
The mine is circular with a slightly concave top and a moderately convex base. The mine case is made of earth-colored terracotta. The outer surface had a thin dull glaze while the inner surface is covered with a thin coat of lacquer. A rubber fuze seat is sealed in place in a hole in the center of the top of the mine.
The explosive filler is contained in a light rubber bag inside the mine.
The fuze body, cover, plunger and striker support are made of Bakelite. The springs, percussion hammer, striker and the release fork are the only metal parts in the mine and with the exception of the release fork, all are contained inside the fuze.

Employment:
May be used as an antivehicuar or antipersonnel mine.

Operation:
The mine is placed in the desired location and the safety pin is withdrawn. The fuze may then be rigged to fire either by pull or pressure.
The percussion hammer located within the fuze is held in place by a release fork to which a trip wire may be attached. When the wire is pulled (10,5-kg pull required) the fork releases the hammer which is forced downward by the hammer spring. The hammer hits the striker forcing it through his Bakelite holder into the percussion cap.
When pressure of 10-12 kg is applied directly on the head of the fuze the plunger spring and hammer spring are compressed causing the hammer head to exert pressure on the hammer release fork. When the plunger is further depressed a groove in its inner surface commes down to the level of the hammer release fork. The pressure of the hammer head cams out the fork. The hammer is released and hits the striker which in turn pierces the detonator.


type 3 mark b:

http://www.ww2technik.de/Bilderchen/japinfwaffen/pionier/jap%20typ%203%20b%20holz%20at%20ap%20mine%20zeichn ung.jpg

mark b:
length/width: 181 mm
total height: 190,5 mm
material of mine wall: wood
thickness of wall: 14,3 mm
total weight without fuze: 2820 g
weight of explosive: 2000 g
color: natural wood
explosive: type 88 (75 % Ammonium Perchlorate, 16 % Ferrosilicate, 6 % wood pulp, 3 % heavy oil)
detonator charge: 50 % Ammonium Nitrate, 50 % TNT
or 90 % Ammonium Nitrate, 10 % Dinitronaphtalene

Description: The mine is simply a wooden box with dovetailed sides to which top and bottom closing pieces have been fastened by screws and nails respectively. It is a standard mine manufactured to standard specifications and employing the type 88 explosive charge and its rubber container, the threaded rubber fuze seat and the same type of fuze used in the type 3 mark a land mine.
The threaded rubber fuze seat is nailed to the bottom side of the top closing piece beneath a hole provided to allow insertion of the fuze.

Employment and Operation:
Same as type 3 mark a land mine.


provisional hemispherical at-mine:

http://www.ww2technik.de/Bilderchen/japinfwaffen/pionier/jap%205%20kg%20selbstmord%20at%20mine%20zeichnung. jpg

from top:
- type 99 mine fuze
- eyelets
- wooden pole
- lashing

Data:
total weight: 5000 g

Description:
The 5-kg hemispherical antitank mine is a weapon designed to help overcome the shortage of antitank weapons and armoured vehicles which the japanese forces experienced during the war. It is a suicide weapon, intended to be placed against an armoured vehicle either by hand or by means of a pole or lines.
The mine is hemispherical in shape, black in color, with the fuze mounted opposite the flat face. It is equipped with a straight projection to which a pole may be lashed, and with four eyelets to which lines may be attached.
The mine is detonated by the same fuze as used in the type 99 magnetic antitank mine.
No specimens of this mine were found outside of the japanese homeland, very few of them having been produced.


Yours

tom! ;)

Panzerknacker
11-13-2006, 05:46 PM
Fantastic, here is another device:

Type 3 AT Grenade:

http://www3.plala.or.jp/takihome/AT-grenade.JPG


Type 3 was a hollow charge grenade thrown by hand. Officially, it was able to destroy a 70 mm thick armor.

The Japanese were late to develop hollow charge ordnance, probably due to the lack of need as, unlike the Russian and German fronts in Europe, there just was not that much of a heavy armor threat in the early years of WWII. The grenade consists of a thin steel cone mounted on a wooden standoff head. Explosive is cast around the cone and covered by a cloth bag. The upper end has a very simple impact base fuze mechanism. The hemp tail attached at the top would hopefully stabilize the grenade in flight, ensuring it struck the target properly. This grenade would penetrate up to 70mm (almost 3") of armor.
While its penetrating ability was a big improvement over the Type 99 Magnetic Grenade (http://www.inert-ord.net/jap02h/grenades/t99mag/index.html#t99mag), you can see that the overall level of design has significantly deteriorated. As with other Japanese late war weaponry, damage to their manufacturing infrastructure from Allied bombing resulted in a significant reduction in the quality of armament produced towards the end of the war. The fuze mechanism here is very simple and does not have much to show in the way of safety features. Evidently once the safety pin was removed, it was just the creep spring that kept the firing pin from the detonator.

http://www.inert-ord.net/jap02h/grenades/t3/index.html

www3.plala.or.jp/takihome/

tom!
11-14-2006, 02:22 PM
Hi.

http://www.ww2technik.de/Bilderchen/japinfwaffen/handgranaten/jap%20typ%203%20hohlladungshandgranate%20zeichnung .jpg

left:
fuze:
- upper fuze body
- safety pin
- striker
- creep spring
- lower fuze body
- Lead Azide
- primer
- gaine
- cyclonite

right:
- tail
- fuze
- screw
- adapter ring
- explosive charge
- cone
- cloth bag
- wooden base

There were only two versions, not three as mentioned at the inert-ord website. The third version is in fact version 2 with Picric Acid instead of Pentolite.
Version 1 had a steel cone , version 2 an aluminium cone.


Type 1 frangible chemical grenade:

http://www.ww2technik.de/Bilderchen/japinfwaffen/handgranaten/jap%20hcn%20granaten%20formen%20glaskoerper%20zeic hnung.jpg

In the 1930´s the japanese army developed various types of chemical agents. For the use of less toxic agents in the field a simple special grenade was developed.

a) frangible smoke grenade:

Data:
over-all length: 83,8 mm
maximum diameter: 66 mm
circumference: 236 mm
color: light yellow
total weight: 231 g
filling: Titanium and Silicon Tetrachloride
weight of filling: 98 g

http://www.ww2technik.de/Bilderchen/japinfwaffen/handgranaten/jap%20frangible%20smoke%20grenade.jpg

Description: This grenade is a flat bottomed sperical container made of clear glass. It has a short neck closed by a rubber stopper held under a red rubber washer within an inner iron crown cap. The filling is a mixture of Titanium and Silicon Tetrachloride which will be hydrolyzed by the moisture of the air, with the formation of Hydroxides and Hydrochloric Acid.

Operation:
The grenade is thrown and on impact the glass bottle breaks releasing the fluid and producing smoke. It is intended for use in screening operations. Though the filler is irritating to the skin as a liquid, in ordinary field concentrations the smoke is hardly irritating enough to cause coughing.

There was also a CS-type filling using a mixture of Chloracetophenone and Chlorpicrin.



b) frangible HCN-Grenade

http://www.ww2technik.de/Bilderchen/japinfwaffen/handgranaten/jap%20type%201%20hcn%20handgranate.jpg

Data:
maximum diameter: 99 mm
total weight: 545 g
filling: Hydrocyanic Acid
weight of filling: 290 g
maximum capacity: 346 g

Description:
These grenades are recognizable mainly as round glass bowls filled with HCN. They differ in minor details.
1. The copper stabilized type is round bottomed whereas the 172 B-K and 172 C-K have flat bottoms.
2. The copper gives one a yellow tint while the other two appear to be light green.
3. The copper stabilized type has one moulded ring around the outside instead of two as the others have.
4. The copper stabilized type is closed by a crown cap over a cork stopper and the other two are closed by a crown cap over a rubber washer.
5. The copper stabilized type is carried in a sheet metal container and the 172 B-K and 172 C-K are carried in cardboard containers.

The grenades contain 290 g of liquid which is about 80% Hydrocyanic Acid. This is a very strong systemic poison.

Operation:
The grenade is thrown and on impact the glass will break releasing the HCN. This gas is swift and deadly if inhaled. In such quantities the gas is excetionally nonpersistent so these grenades are designed for use in small closed spaces such as pillboxes or tanks.

These grenades were used against british tanks in Burma.


Yours

tom!

Panzerknacker
11-19-2006, 12:45 PM
Inteligency report from March 1945 in regard of this weapons:

Besides the Model 99 magnetic mine, which already has been used on a wide scale, two other hand-thrown antitank demolitions are known to have been developed and experimented with by the Japanese Army. They are the Conical Hand Mine and the Experimental Hand-thrown Mine.

http://i7.tinypic.com/48z5jih.jpg

The Model 3 Conical Hand Mine actually is an antitank bomb or hand grenade. This grenade has been found in captured ammunition dumps in the Philippines, although there have been no reported attempts by the enemy to use it. Of Japanese naval manufacture, it comes in two sizes—one weighing 2 pounds, and the larger weighing 3 pounds. Like the Lunge Mine, the Conical Hand Mine is a cone shaped, hollow charge designed to direct the force of explosion against tank armor. The large end of the grenade cone is covered by a bowl-shaped wooden base. The whole body of the grenade is encased in a silk bag sewn to fit tightly around the explosive unit and the wooden base.
The fuze, which functions on impact, is located in the narrow end of the bomb, and is designed to detonate regardless of the angle at which the grenade strikes the target. To ensure detonation, the grenade must be thrown with force. To be safe from the effect of the explosion, the soldier who throws the grenade must be at least 35 feet from the target. The grenade reputedly can penetrate 3/4 inch of armor.
Approximately 20 inches of hemp-palm fibers resembling a grass skirt are attached to the narrow end of the grenade, and serve as a tail or stabilizer when the grenade is thrown. This permits the grenade to strike base-first on the target.
The Experimental Hand-thrown Mine is a spherical bomb 4.7 inches in diameter. It is composed of 3 pounds of explosive encased in a black aluminum shell. Like the Conical Hand Mine, it is reported as capable of penetrating 3/4 inch armor, and must be thrown from a distance of at least 30 feet from the target. A carrying handle and a fuze cover are attached to the outside of the mine. During shipment the fuzes are packed separately, and must be inserted in the mine by unscrewing the fuze cover and inserting the fuze in the recess provided. The fuze is similar to that on the Conical Hand Mine, and is kept unarmed by a safety pin. Since the fuze will detonate the bomb upon impact with the target, the mine requires careful handling after the safety pin has been removed.

http://www.lonesentry.com/articles/jp_tankhunters/index.html

Tony Williams
02-04-2007, 06:01 AM
The typ 97 20 mm automatic gun (original designation) was a side development of the type 98 20 mm aa-gun using the same muzzle break and other design parts. The total weight was 55 kg, 72,5 kg with handles. The shield wasn´t used often to increase mobility.

Sorry to come a bit late to this one :roll:

My information is that all Type 97 AT rifles were semi-auto. Some confusion may have been caused by the fact that a full-auto version (initially also known as the Type 97) was developed for aircraft use, and used in two variations: the Ho-1 (flexible) and the Ho-3 (fixed). These had much bigger magazines and fired at about 400 rpm. They saw very little use.

Reference was made to the ammo used: it is correct that some projectiles were shared between the 20x125 used in the Type 97 and the 20x142 used in the Type 98 AA gun. The pic below (from the ammo photo gallery on my website) shows the difference in size between the two cartridges. As you can see, they are both loaded with the same type of AP projectile.

Tony Williams: Military gun and ammunition website (http://www.quarry.nildram.co.uk) and discussion forum (http://forums.delphiforums.com/autogun/messages/)

http://www.quarry.nildram.co.uk/20mm2.jpg

Panzerknacker
02-09-2007, 09:39 AM
The white-green band of those indicates API bullet I guess, rare color designation.

Strina-Croatia
02-12-2007, 12:21 PM
They had a great variaty of infantry AT weapons but which tanks did they actually encounter?

Panzerknacker
02-12-2007, 05:51 PM
They had to fight agaist the M3 Stuart and the M4 Sherman this last one mostly belonging to the Marines.

tom!
02-13-2007, 11:56 AM
Hi.

Enemy tanks:

China:
among others
- BA 20
- BA 10
- SdKfz 222
- SdKfz 223
- Panzer I
- Vickers 6t
- Vickers amphibious tank
- T-26
- Renault FT 17/18
- CV 33
- US Medium M4
- US Light M3

UK and Commonwealth:
among others
- Bren Carrier
- US Halftrack M3
- Light Mk VI
- Rolls Royce armoured car
- Valentine, also flamethrower variants
- Mathilda II, also flamethrower variants
- US Light M3
- US Medium M3 Lee
- GB Medium M3 Grant
- US Medium M4

USA:
among others
- US Halftrack M3 various variants
- US Light M2
- US Light M3
- US Light M5
- US Medium M3
- US Medium M4 various variants
- US Tank Hunter M10
- US Tank Hunter M18
- LVT various variants

Netherlands (KNIL):
among others
- ovaervalwagen
- Krupp APC
- Vickers 6t
- Vickers tankette
- GB Light Mk V and Mk VI
- Bren Carrier

Sovíet Union:
among others
- BA 5
- BA 6
- BA 20
- BA 64
- BT 2
- BT 5
- BT 7 various variants
- T-26 various variants
- T-38
- T-60
- T-70
- T-34 various variants
- IS 1
- IS 2
- IS 3
- SU-12
- SU-76
- SU-85
- SU-100
- SU-122
- ISU-122
- SU-152
- ISU 152

Yours

tom! ;)

Panzerknacker
02-13-2007, 07:29 PM
Well, that is a list ¡


IS 1
- IS 2
- IS 3


Poor japanese panzerknackers, they have no a effective weapon against those.

genkideskan
06-10-2007, 04:56 PM
Here is the scarce ammo for the 70mm Type 4 rocket launcher.

It is a hollow charge projectile using a rocket motor. Ignited by a simple

percussion primer cap in the middle of the rocket jet plate.

See the dismantled projo at the top. At the bottom a 70mm HE shell

for comparison.


Best

Panzerknacker
06-11-2007, 06:06 PM
Interesting, that was gyro a stabilized projetile?

genkideskan
06-13-2007, 05:33 AM
Yes spin stabilized, the jets are not drilled straight but in an angel.

I enclose pics showing the fuze of the conical AT mine ( left ) and pics of the "Ball"

mine with a webbing belt handle instead of the steel wire handle. The fuse is somewhat tricky

because after removing the safety pin the

fuse react even when the mine is falling down, ..... in any direction.

A japanese AT grenade fired from a flare pistol was developed ,too.



.

genkideskan
06-13-2007, 05:49 AM
Here is a picture of the glas body of a smoke / gas grenade.


.

Panzerknacker
06-13-2007, 12:08 PM
Beautiful pictures Genkideskan, many thanks.


Tactics:


http://img383.imageshack.us/img383/599/masoquismotx2.jpg


http://img377.imageshack.us/img377/5631/81568802xy6.jpg


http://img377.imageshack.us/img377/9315/41897125bt0.jpg


The author exaggerates a bit here, not all the weapons are "self sacrifice" the type 99 magnetic mine for example could be used with good effect and without (nessesarily) risking the life of the soldier.

From; Osprey s "Infantry antitank tactics of ww2"

tom!
08-19-2007, 04:15 AM
Hi.

Some more atg pics:

experimental 37 mm at-gun Raku:

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20exp%2037mm%20ATG%20raku%202.jpg


experimental 57 mm anti-tank gun:

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20exp%2057%20mm%20ATG%20hinten.jpg

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20exp%2057%20mm%20ATG%20lafette%20front.jpg

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20exp%2057%20mm%20ATG%20lafette%20hinten.jpg

Yours

tom! ;-)

tom!
08-19-2007, 04:17 AM
Hi.

Some more:

Type 97 experimental 47 mm anti-tank gun:

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20exp%20typ%2097%2047%20mm%20ATG%20links.jpg

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20exp%20typ%2097%2047%20mm%20ATG%20mannschafts zug.jpg


Type 1 47 mm ant-tank gun:

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20typ%201%2047%20mm%20pak%203.jpg

http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20typ%201%2047%20mm%20pak%204.jpg


Yours

tom! ;-)

bwing55543
08-19-2007, 07:25 AM
I seem to recall the japs using this weapon in MOH Rising Sun.

So do I.

Panzerknacker
08-19-2007, 11:04 AM
Fantastic pictures Tom, quite weird the muzzle in this experimetal gun, it seems a smaller caliber than 57mm.


http://www.ww2technik.de/Bilderchen/jappak/kanonen/jap%20exp%2057%20mm%20ATG%20lafette%20front.jpg

tom!
08-19-2007, 02:59 PM
Hi.

This photo shows the gun without barrel. The hole you see is for filling in the liquid of the hydrospring recoil mechanism. :mrgreen:

Yours

tom! ;)

Panzerknacker
08-19-2007, 05:13 PM
Ha,ha,ha, very true, sorry for the silly question. :mrgreen:

overlord644
08-19-2007, 07:55 PM
This may sound stupid but i believe it was on modern marvels or some other show that this method of knocking out an American tank came up:

Panzerknacker
08-20-2007, 01:14 AM
Nothing "modern" on that action.

genkideskan
10-05-2007, 07:25 AM
Have this foto since a long time and can't find closer informations.

"Rifle" grenade rod type AT shell for T 97 AT rifle - written at the backside.

It must be a hollow charge grenade with a rod, that was inserted to the barrel of the Type 97 AT rifle. Fired by a blank or better propelling cartridge without bullet.
This technic is well known for rifle grenades and german rod shells for several artillery pieces ( Stielgranaten ).

Any idea ?

jabu
11-17-2007, 01:00 PM
Hi,
It is little well-known improvised Japanese AT hand mine/grenade .
This weapon earlier displayed him already Genkideskan.
I know, from he was produced (in unknown quantity) on Philippines, as well as ( to be maybe) in Japan and Manchuria.
Worked out probably in end 1943 year.

I put fragment article NEW WEAPONS FOR JAP TANK HUNTERS - from Mach 1945 (US. Army Intelligence Bulletin).
“The Experimental Hand-thrown Mine is a spherical bomb 4.7 inches in diameter. It is composed of 3 pounds of explosive encased in a black aluminum shell. Like the Conical Hand Mine, it is reported as capable of penetrating 3/4 inch armor, and must be thrown from a distance of at least 30 feet from the target.
A carrying handle and a fuze cover are attached to the outside of the mine. During shipment the fuzes are packed separately, and must be inserted in the mine by unscrewing the fuze cover and inserting the fuze in the recess provided. The fuze is similar to that on the Conical Hand Mine, and is kept unarmed by a safety pin. Since the fuze will detonate the bomb upon impact with the target, the mine requires careful handling after the safety pin has been (...)”.

I add colored photos and drawing with bulletin.
I apologize for my bad English,

Regards,
jabu

P.S. Pleasantly get to know you Tom! I see, you from also be interest AT Japanese infantry weapons.

jabu
11-17-2007, 02:23 PM
Hi,
and yet two interesting Picture.

17. Japanese lunge AT mine – Shitotsu bakurai (version – 5.3kg); by probably ammo in Type 97 81.4 mm Infantry Mortar.

32. “Batch of survival” Japanese tank hunters:
Type 93 multi-purpose mines,
Type 3 Box Mine,
Molotov cocktail,
Type 3 AT Hand Grenade,
And probably AT Mine (similar how German Hafthhohlladung HHL 3).
Moreover Type 89 HE shell from Typ 89 50 mm Grenade Discharger.

Regards,
jabu

jabu
11-19-2007, 11:55 AM
Hi,

It is Ji-Te Dan"ジテ弾". As the Type 97 AT Rifle became ineffective
against Allied tanks, hollow charge grenade for Type 97 was developed.
Special cartridge was used to launch it. Ji-Te Dan ended with only
experiment and did not see action.

Similar hollow charge grenade one designed for Type 94 37 mm AT
Gun.
Its specifications are as follows.
Caliber : 80 mm
Explosive : 0.675 kg
Penetration : 100mm

It was experimental only,

Regards,
jabu

genkideskan
12-01-2007, 06:08 PM
Thanks Jabu,

that is a great info about the 37mm AT grenade and a unknown picture for me.

jabu
12-09-2007, 01:55 PM
Hi Genkideskan,
it was gladdened, from I could help.

Photo taken by on Guadalcanal, briefly after Japanese's evacuation in February 1943. To be visible (AT weapons), from left:
Type 93 AT Mine, Type 99 Magnetic AT Mine, Type 2 AT Rifle Grenade 40 mm, and also: Type 94 and Type 99 smoke candle, Typ 89 shell from Type 89 Grenade Discharger, Type 91 and Type 97 hand grenades, and probably Type 12 shell from Type 11 37 mm Infantry Gun.
Regards,
jabu

tom!
01-23-2008, 01:46 PM
Hi.

About the type 97 at-rifle´s ammunition:




The 20X141 mm was the type 98 he-round.... hm.

Maybe the author meant the projectile of the type 98 he-round of the aa-gun, used with a 125mm cartridge. That would make more sense to me.


I recently stumbled upon this:

http://www.ww2technik.de/Bilderchen/japmuni/20%20mm/jap%20typ%2098%2020%20mm%20het%20flak%20projektil% 20zeichnung.jpg
Type 98 HE-T round for the type 98 20 mm aa-gun


http://www.ww2technik.de/Bilderchen/japmuni/20%20mm/jap%20typ%2098%2020%20mm%20het%20projektil%20zeich nung.jpg
Type 98 HE-T round for the type 97 20 mm at-rifle


The projectiles have a slightly different shape, a slightly different thickness of the explosive container wall and different closing plugs.

There were a type 100 HE-T self destructing projectile and a type 100 AP-T projectile which were both used with both weapons so why two only slightly different HE-T projectiles?

Any ideas?

Yours

tom! ;)

genkideskan
02-18-2008, 12:33 PM
The one is the type 98 projectile (bottom) the other the type 100 projectile

Byron
03-11-2008, 10:45 PM
Does anyone have information on the Shinhoto Chi-ha tank variant developed in 1944 for the navy (SNLF support)? It mounted a 120mm short naval gun. I am very interested in the gun performance and ammo, if anyone can help. Thanks!

Tony Williams
03-12-2008, 04:56 AM
I have no data on that variant of the tank (the biggest gun I know of that it mounted was 75mm) but if it helps, the short 120mm (L/12) naval gun fired a 13 kg HE shell at 290 m/s for a maximum range of 5,300m (at high elevation).

tom!
03-12-2008, 12:18 PM
Hi.

The tank used a japanese short 120 mm naval gun in a modified Shinhoto (to be translated as "new turret") of the type 97 medium tank Chi-Ha.

The gun was introduced by IJN in 1941 as close-defence armament for transport vessels.

Here a well-known picture

http://www.ww2technik.de/Bilderchen/jappanzer/marine/jap%20typ%2097%20120%20mm%20gun%20tank.jpg

5-side-view (muzzle break and several minor details not correct):

http://www.ww2technik.de/Bilderchen/jappanzer/marine/jap%20typ%2097%20chi-ha%20120%20mm%20kurz%20fuenfseiten%20skizze.jpg

A massive muzzle break was added to reduce recoil forces:

http://www.ww2technik.de/Bilderchen/jappanzer/waffen/jap%20120%20mm%20short%20gun%20tank%20m%fcndungsbr emse.jpg

inside view of the turret, breech top left:

http://www.ww2technik.de/Bilderchen/jappanzer/waffen/jap%20120%20mm%20short%20gun%20tank%20turmeinblick %20kanone.jpg

Yours

tom!

tom!
03-12-2008, 12:22 PM
Hi.


I have no data on that variant of the tank (the biggest gun I know of that it mounted was 75mm) but if it helps, the short 120mm (L/12) naval gun fired a 13 kg HE shell at 290 m/s for a maximum range of 5,300m (at high elevation).


The biggest gun (regarding diameter) mounted on the Chi-Ha-chassis was the type Meiji 38 150 mm howitzer. The vehicle was named type 4 gun tank Ho-Ro:

http://www.ww2technik.de/Bilderchen/jappanzer/spg/ho%20ro/jap%20typ%204%20%20ho-ro%20schraeg%20oben.jpg

The biggest gun (regarding size) was a type Taisho 10 or Taisho 11 120 mm gun L/45 (At least I think it is one of these guns). One vehicle was found at Yokosuka naval yard after surrender:

http://www.ww2technik.de/Bilderchen/jappanzer/marine/jap%20typ%2097%20chi-ha%20long%2012%20cm%20naval%20gun.jpg

Yours

tom! ;)

Byron
03-12-2008, 04:57 PM
Thanks, everyone! Good information. :)

Tony Williams
03-12-2008, 09:47 PM
A massive muzzle break was added to reduce recoil forces:


It wouldn't have been very effective. Muzzle brakes work best with high-velocity guns.

tom!
03-13-2008, 01:03 AM
Hi.

Here some additional infos on the gun as used on naval units and island defences:

naval weapons (http://www.navweaps.com/Weapons/WNJAP_47-12_Short.htm)

Yours

tom! ;)

Byron
03-13-2008, 09:08 AM
Thanks Tom!

Do you happen to know how the SNLF organized the Shinhoto "120" AFV? I'm wondering if it was in 2 AFV sections or 4-6 AFV per platoon?

Also, how did the Japanese sights on the AFV mounted gun compare to other nations?

Thanks for any information!

riva ridge
06-16-2008, 11:13 AM
was woundering if the japs had captured/used any of the hotchkiss 25mm anti-tank guns

tom!
06-16-2008, 12:15 PM
Hi.

The japanese navy used licence-built 13,2 mm and 25 mm Hotchkiss-type aa-machine canons.

But I never heard of any captured/used 25 mm at-guns.

Yours

tom! ;)

alfiechan
09-27-2008, 04:13 AM
In 1944 the Japanese developed 2 types of new anti-tank weapons. One was a bazooka-like weapon that could penetrate 85-90mm of armor at 100m and the other one was a panzerfaust-like weapon with 45 and 75mm missiles, able to penetrate 80mm. The bazooka-like weapon was built in the thousands and they were kept for the invasion of Japan.