I just don't know.
Heheh, mission complete
OK, It was BOK-15. A little bit of history
In 1937 after series of succesful transpolar flights, in USSR lots of pilots wanted to get some more flight records, and Stalin allowed to make one flight outside USSR in 1939. A new airplane was ordered, which would be able to fly for 20 000 km (~11 000 nm) on altitude around 10 000 meters (~33 000 feet). In may 1938 Chizhevsky agreed to make this plane, but diesel engines were either too heavy or too fuel-consuming. Kerosene-burning engines were even more fuel-consuming. As result, the maximum distance of the flight was around 15 000 km (~8 000 nm), which was just not much enough. In january 1939 Kaganovich said to Stalin that Chizhevsky was not loyal enough, and delayed BOK-15 on purpose, which resulted in Chizhevsky's arrest next month. In october 1939 one finished airplane made it's first and the only test-flight, and all the BOK programme was cancelled due to war and previous fails.
VS, should I keep such airplanes coming onto this thread?) And who will post since I can see no rules about not guessed airplanes
