T-28 (medium tank)

T-28
T-28E registered as R-48, since 1943 Ps. 241–4,[1] at the Parola Tank Museum in Finland
Type	Medium tank
Place of origin	Soviet Union
Service history
In service	1933–45
Used by	Soviet Union
Wars	Soviet invasion of Poland, Winter War, World War II, Continuation War
Production history
Designed	1931
Produced	1932–41
No. built	503
Variants	T-28E, T-28 Model 1940, OT-28
Specifications
Mass	28 tonnes
Length	7.44 m (24 ft 5 in)
Width	2.87 m (9 ft 5 in)
Height	2.82 m (9 ft 3 in)
Crew	6
Armour	20–40 mm (0.79–1.57 in)
Main armament	76.2 mm KT-28 howitzer (70 rounds)
Secondary armament	4 or 5×7.62 mm DT machine guns (8,000 rounds)
Engine	46.9 L Mikulin M-17 V12 engine 500 hp (370 kW)
Power/weight	18 hp/t (13 kW/t; 16 hp/ST)
Suspension	plunger suspension with twin bogies
Operational range	220 km (140 mi)
Maximum speed	43.5 km/h (27.0 mph)

The T-28 was a Soviet multi-turreted medium tank. The prototype was completed in 1931, and production began in late 1932. It was an infantry support tank intended to break through fortified defences. The T-28 was designed to complement the heavier T-35 (also multi-turreted), with which it shared turret designs. The type did not have great success in combat, but it played an important role as a development project for Soviet tank designers. A series of new ideas and solutions that were tried out on the T-28 were later incorporated in future models.