The Su-6 single-seat assault aircraft was designed around the experimental M-71 engine and intended to compete with Ilyushin's Il-2. The Su-6 offered a considerably higher performance than the Il-2, and carried a more effective armament, but by this time the Ilyushin design was already in production, and as manufacture of the M-71 engine had not begun.
Development started in 1939. Second Su-6-2 (improved) version was built in 1942, and the last one (Su-6-3), powered by liquid-cooled 2000hp AM-42 started flight testing early in 1944.
Engine: 1 x ASh-71F, 1620kW
Max take-off weight: 6500 kg / 14330 lb
Empty weight: 4000 kg / 8819 lb
Wingspan: 13.5 m / 44 ft 3 in
Length: 9.2 m / 30 ft 2 in
Wing area: 26.0 sq.m / 279.86 sq ft
Max. speed: 500 km/h / 311 mph
Ceiling: 8100 m / 26600 ft
Range w/max.fuel: 970 km / 603 miles
Armament: 2 x 37mm machine-guns, 3 machine-guns, 10 missiles, 400kg of bombs