Ilyushin Il-20 (1948)
The Ilyushin Il-20 was a Soviet prototype for a heavily armored ground attack aircraft to replace the Ilyushin Il-10. It featured a number of innovative concepts including a cockpit mounted on top of the engine, directly behind the propeller, and wing-mounted autocannon that could be adjusted on the ground to fire level or depressed 23° to allow the aircraft to strafe ground targets while remaining in level flight. However it proved to be slower than the Il-10 and its immature M-47 engine proved to be problematic during flight tests in 1948–49 and it was not placed into production. The test pilots called the aircraft the Gorbach (Hunchback).
Read more about Ilyushin Il-20 (1948): Development, Specifications (Il-20)