Sukhoi Su-2
The Sukhoi Su-2 was the Soviet major light-bomber at the commencement of Barbarossa, but was already obsolete by that time.
In 1936 the Soviets initiated a design competition for a light bomber under the code name "Ivanov". Pavel Sukhoi, working at the Tupolev design bureau, designed the ANT-51, and the first prototype flew in 1937. Problems with Soviet engines led to arrests and purges, and production only commencing in 1940, now with the production designation of BB-1 (Short-range Bomber 1). With the rationalisation of Soviet designators, the type name was soon changed to Su-2 (as Sukhoi's first bomber type).
The aircraft suffered heavy losses at the start of Barbarossa, but production was planned to be continued with the relocation of the factory east with the evacuation of Soviet industry to the Urals. Further engine problems led to construction now with the M-82 engine. This had been planned to be installed in the Su-4, which was a prototype version with wooden wings which was not entered into serial production. These late model Su-2's are often incorrectly referred to as Su-4's because of their engine.