The Sukhoi Su-2 (Russian:Сухой Су-2) was a double seat Soviet bomber aircraft. It was used in World War II,
during the Battle between the Soviet Union and Nazi Germany, at this time it was the best leightweight Soviet Bomber. It was developed by Pavel Sukhoi.
Development of the Su-2 began in the year 1936, to replace the Polikarpov R-5 biplane; the first prototype, called ANT-51, which was designed as the "Ivanov" aircraft, had its first flight on 25th August 1937 and was flown by Michail Gromov. At least it failed against Il-2, which had a better armor and was better armed, only in terms of flight performance the Su-2 was superior.
After testing with different aircraft with different engines, in 1939 the BB-1 was built (BB = Blishni Bombardirowshtshik = Close-range bomber), it was powered by a M-87A engine, and in 1940 it was equipped with the new M-88-engine and entered service as the Su-2.
At the beginning of 1941, a new upgraded derivative with a more powerful M-88B engine was built. Now it was equipped with two, instead of four machine guns, to make room for six unguided RS-82 missiles.
In autumn 1941 a Su-2 with an ASh-82 radial-engine was unveiled. In 1942 it was modified into the Su-4 with a better amored fuselage. It also had a better M-90 engine with a power of 1,520 kW and then it was armed with two 12.7 mm machine guns and two 7.62-mm machine guns. However this derivative never entered operational status.
The Su-2 was produced until autumn 1942, all in all 793 aircraft were built.