The Polikarpov TB-2 (Russian: Поликарпов ТБ-2) was a Soviet heavy bomber prototype designed and tested in the 1920s. It was a sesquiplane of wooden construction, with engines mounted on the bottom wing. Work on the sole prototype began in 1927 and it was tested in 1930. Although TB-2 performance was superior to that of the Tupolev TB-1 in service at the time, it was deemed insufficient for 1930 and the project was abandoned.
== Specifications (TB-2) == Data from Istoriia konstruktskii samoletov v SSSR do 1938 g.General characteristics Crew: 5 Length: 17.6 m (57 ft 9 in) Wingspan: 27 m (88 ft 7 in) Wing area: 128 m2 (1,380 sq ft) Airfoil: Clark Y (16%) Empty weight: 4,220 kg (9,304 lb) Gross weight: 6,770 kg (14,925 lb) Powerplant: 2 × BMW VI V-12 water-cooled piston engines, 373 kW (500 hp) each Propellers: 2-bladed fixed-pitch propellers Performance
Maximum speed: 216 km/h (134 mph, 117 kn) Range: 1,200 km (750 mi, 650 nmi) Service ceiling: 6,800 m (22,300 ft) Time to altitude: 3,000 m (9,800 ft) in 12 minutes Wing loading: 53 kg/m2 (11 lb/sq ft) Power/mass: 0.110 kW/kg (0.067 hp/lb) Take-off run: 210 m (690 ft) Landing run: 180 m (590 ft) Horizontal turn time: 26 s