Not a good quality photo but it allows us to better understand this singular project. 

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Despite its rapid development, after testing late in 1941, and some airframe strengthening, the He.111Z proved to be an efficient glider tug, with more than enough power to tow the new giant gliders. The He.111Z entered production early in 1942 and were placed in service that year. Only the prototypes and the first few production models used He.111H-6 airframes; the remainder were based on the He.111H-16. They were very successful, and well-liked by the crews.

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Original caption: &quot;The Ju-87G Stuka, showing the 3.7 Flak 36 gun mounted under the wing. The cover to the entire mechanism was taken out for the photo. The Stuka was very effective as a tank killer with this weapon. The fundamental question at stake was: how many aircraft could be delivered to the Russian theater of war to quickly balance the threat posed by the new T-34 tanks?&quot;