the fuselage was of all-metal construction. Power came from a Shvetsov ASh-82FN piston engine with two TK-3 turbochargers in the nose and a Glushko RD-1-KhZ rocket engine in the tail. The piston engine produced 1,380 kW (1,850 hp), while the rocket engine utilized kerosene and nitric acid for fuel and generated 2.9 kN (600 lbf) of thrust for up to 4 minutes. Armament consisted of three 20 mm ShVAK cannon with 370 rounds of ammunition. The sole Su-7 was completed in 1944. Test flights demonstrated a top speed of 510 km/h (275 kn, 315 mph) at 12,000 m (39,370 ft) without the rocket motor, and 705 km/h (380 kn, 440 mph) with the rocket. In 1945, the rocket motor exploded during flight testing, killing the pilot and destroying the aircraft. Variants A The initial design for the Su-6. S The second prototype with various modifications. SA (modified) The SA with 2 x OKB-16 Cannon and 2x ShKAS machine guns. S2A The Su-6 fitted with a second cockpit with a rear-firing Berezin UBT machine gun. Testing revealed better performance and armour than the Il-2, but despite recommendations, production was not carried out due to the M-71 engine not entering production. Operators Soviet Air Force Specifications (Su-6(SA) 2nd prototype) See also References Su-06 1940s Soviet attack aircraft Single-engined tractor aircraft Low-wing aircraft Abandoned military aircraft projects of the Soviet Union World War II Soviet ground attack aircraft Aircraft first flown in 1941