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KK,
Note:
1.) Different end exhaust
2.) Different canopy, one has a curved top while the other is striaght.
Do you see it ?
Anyway it's just a guess as that's all we can do on things like this
I found a picture showing a model of Deutsche Luftfahrtsammlung in 1936. Quite a large collection for such an early museum. Mostly outside it appears.
After reading it again in Kool Kittys link, Im struck by the lack of foresight shown by a number of Germanys leading aviation experts.
Fair enough they didn't consider the aircraft fit for combat, but disregarding the technology completely......
The Russians first started work on jets in the early 1920s. They set up a specialized gas turbine engine reserach group in 1926 and in 1930 the group was headed by V Oovarov. At that time, the primary focus was on turboprop engines and, in 1936, the group developed the 1,150 shp GTU-3 turboprop that was proposed as a powerplant for the TB-3 bomber. The prototypes of the GTU-3 were first test-flown in 1938. That year, the group split into two parts, one of which developed turboprops, the other of which started work on turbojets. That part was headed by Arkhip Mikhailovich Lyulka. By 1941, he had developed the RD-1 jet engine that delivered 1,100 pounds of thrust. Meanwhile, the Oovarov group were assembling a turboprop that could deliver 4,400 shp.