[1] The second prototype flew only in January 1942 because the OKB had to be evacuated after the start of the Great Patriotic War.

[2] It was armed with two 23 mm cannon, four machine guns and ten rails for aerial rockets.

Official tests revealed that the two-seat Su-6 had a 100 km/h (54 kn, 62 mph) greater top speed than the Il-2, although with a considerably smaller payload.

[2] Although the Su-6 never entered production, in 1943 Pavel Sukhoi was awarded the Stalin Prize of the 1st Degree for the development of the aircraft.

[2] In 1945, the rocket motor exploded during flight testing, killing the pilot and destroying the aircraft.