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Thread: Ace maker, P-39 Airacobra in the USSR.

  1. #16
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    Have noticed the US Air Force was focused on high altitude requirements..
    Actually the U.S army air corps was guilty in part to ruin the performances at high altitude when it asked to remoive the turbosuperchager, the allison engine was left with a single stage supercharger, not very useful for operate over 12000ft.

  2. #17
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    St. Petersburg
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    Rather interesting information about lend-lease aircraft:
    http://lend-lease.airforce.ru/englis...deliveries.htm
    "A price tag was naturally attached to all deliveries, with following typical fighter prices:
    P-40 Kittyhawk - 44.900 dollars, P-39 Airacobra - 50.700 dollars and P-47 Thunderbolt - 83.000 dollars
    "
    Does anyone has information, what was the price of making this planes on US factory?

    and some more:
    http://lend-lease.airforce.ru/englis...cles/index.htm

    among it read - the memories of a pilot, who used both p-39 and p-40
    http://lend-lease.airforce.ru/englis...ikov/index.htm

  3. #18
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    Southern Russia , Krasnodar
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    Quote Originally Posted by Dragkon View Post
    Rather interesting information about lend-lease aircraft:
    http://lend-lease.airforce.ru/englis...deliveries.htm
    "A price tag was naturally attached to all deliveries, with following typical fighter prices:
    P-40 Kittyhawk - 44.900 dollars, P-39 Airacobra - 50.700 dollars and P-47 Thunderbolt - 83.000 dollars
    "
    Does anyone has information, what was the price of making this planes on US factory?

    and some more:
    http://lend-lease.airforce.ru/englis...cles/index.htm

    among it read - the memories of a pilot, who used both p-39 and p-40
    http://lend-lease.airforce.ru/englis...ikov/index.htm
    Oh thatks a lot Dragkon.
    And welcome to the forum.
    Good info.
    About prices.
    I just know that the most experinsive american fighter was two-fuselage full metal the P-38 ( over $138 000) . the P-39 "Airacobra" cost 46000 ,P-51 "mustang"; - 54000, and the twin-engined bomber"Mithcell" - 96000. The B-17 ( $225 000)
    Last edited by Chevan; 09-24-2007 at 12:44 PM.

    "I decide who is a Jew and who is an Aryan "- Hermann Goering

  4. #19
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    New Zealand
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    1,087

    Default Re: Ace maker, P-39 Airacobra in the USSR.

    Quote Originally Posted by Panzerknacker View Post
    Actually the U.S army air corps was guilty in part to ruin the performances at high altitude when it asked to remoive the turbosuperchager, the allison engine was left with a single stage supercharger, not very useful for operate over 12000ft.
    Hello My friend, had not realised you had a P39 thread.

    As to the supercharger on the Allison V1710 engine the P39 used:
    the US State Department insisted in early 1942 that the supercharger not be exported, asserting that it would place a strategic advantage in enemy hands if a supercharger was recovered by Axis forces from a downed/crashed American aircraft.
    As a direct result, several aircraft types customarily powered by a supercharged Allison V1710 were produced with the engine in an un-supercharged form, and exported thus. Without exception, the performance of each was mediocre at best, if not outright criminally bad, regardless of altitude.

    The Allison V1710 family was initially comparatively weak at high altitude in any case, even when supercharged, largely due to inherent design weaknesses in the intake ports to the combustion chambers, and the lack of knowledge of air/gas flow dynamics prior to combustion in the engine cylinders. This was certainly true of the C12 through C15 series engines, which were consequently directly dependent on the supercharger to overcome the inbuilt weaknesses.
    Later, with some re-design effort directed to the intake ports and pre-combustion flow dynamics, coupled to redesign of the combustion hemispheres and cylinder heads, and redesign of the piston heads, the E and F series engines emerge. These, while still not quite the equal of contemporary British, German, or even Russian engines, were nonetheless a vast improvement over the C series engines in altitude performance terms.

    It is worthy of note that the vast majority of P39s and P63s flown by the Soviets were powered by E and F series engines.

    In 1942, the P38 Lightning was about the only American fighter aircraft capable of medium to high altitude performance, with supercharged engines. Without the superchargers, it was, rightly, condemned by the British as useless.

    In similar case, broadly speaking, was the P39, which in un-supercharged form was known as the P400. The design had been intended for medium to low altitude work, with planned development for high altitude later in its' production life.

    Those developments merged with others regarding the laminar flow wing, which thus the P63 emerges, but again relying on a supercharged Allison V1710 engine, usually an E or more commonly F series.

    In my view, the mismanagement of the engine issue is one reason little is written of the P39 or P63, and why books on Allison powered aircraft tend to skim rather lightly over details of engines and concentrate rather more on handling and armaments.

    Regards, Uyraell.
    Last edited by Uyraell; 02-16-2009 at 11:42 AM.

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