Polikarpov TB-2

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.[1]

TB-2
Role	Bomber
National origin	Soviet Union
Manufacturer	Polikarpov
First flight	1930
Number built	1

Specifications (TB-2)

Data from Istoriia konstruktskii samoletov v SSSR do 1938 g.[1]

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%)[2]
• 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 (9,843 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 (689 ft)
• Landing run: 180 m (591 ft)
• Horizontal turn time: 26 s

References

1. Shavrov V.B. (1985). Istoriia konstruktskii samoletov v SSSR do 1938 g. (3izd.) (in Russian). Mashinostroenie. ISBN 5-217-03112-3.
2. Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.