Only a marginally later design than the British Fairey Battle, the Soviet Sukhoi Su-2, designed by Pavel Sukhoi, previously of the Tupolev design bureau, entered service with the V-VS early in 1941 but, as far as is known, was not encountered during the Winter War which ended the previous year. Derived from Sukhoi's ANT-51 and designated BB-1 during its early trials, the aircraft was fairly efficient by current standards once the M-87 engine had been replaced by the M-88 and then the M-88B. Tactical concepts changed swiftly during the first two years of the war, however, and the use by the Germans of large forces of single-seat fighters in support of their advancing armies came as a body blow to the Soviets in mid-1941. Despite being further improved by installation of the 1,000-hp (746-kW) M-88B radial, the Su-2 was found to be desperately vulnerable and virtually unable to defend itself with its single small-calibre machine-gun in the unwieldy manually-operated dorsal turret. Estimates suggest that about 100 were in service with the Frontovaya Aviatsya at the time that the German army rolled into the Soviet Union in June 1941, but that dozens were shot down by Flak and fighters in the first few disastrous weeks; moreover, such was the generally poor standard of training in the Soviet air force that the Su-2 proved almost useless as a weapon against mobile battlefield targets.
The parlous state of the Soviet aircraft industry in 1941 prevented much being done to remedy the immediate lack of suitable ground support aircraft (until production of the two-seat Il-2m3 could be stepped up) and recourse was made to further attempts-to improve the Su-2 by installation of the 1,520-hp (1134-kW) M-82 radial and freguent deletion of the dorsal turret, but with little tactical benefit. Accepting that losses would remain high, the Soviets therefore simply loaded the aircraft with further bombs and rockets on the supposition that the more explosive delivered against the enemy the better the chances of some degree of success. This version, as well as the completely redesigned Su6, were abandoned in favour of all-out dependence on the Il-2m3. The Su-2 probably did not survive in production beyond mid-1942.
Specification Sukhoi Su-2 (late production)
Type: two-seat close-support aircraft
Powerplant: one 1,520-hp (1134-kW) Shvetsov M-82 air-cooled radial piston engine
Performance: maximum speed 486 km/h (302 mph) at 1525 m (5,000 ft); service ceiling 8800 m (28,870 ft); range with bomb load 1100 km (683 miles)
Weights: empty 3273 kg (7,216 lb); maximum take-off 4700 kg (10,362 lb)
Dimensions: span 14.30 m (46 ft 11 in); length 10.46 m (34 ft 3% in); height 3.80 m (12 ft 6 in); wing area 29,0 m2 (312.1 sqft)
Armament: four fixed forward-firing 7.62-mm (0.3-in) machine-guns in wings and one or two in dorsal turret, plus a bombload of 400 kg (882 lb) carried internally and either bombs or rockets up to about 500 kg (1,102 lb) carried externally