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 wooden-construction sesquiplane 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]

Specifications (TB-2)

Data from Shavrov 1985^[1]

General characteristics

• Crew: 5
• Length: 17.6 m (57 ft 9 in)
• Wingspan: 27 m (88 ft 7 in)
• Height: ()
• Wing area: 128 m² (1377.8 ft²)
• Empty weight: 4,220 kg (9,304 lb)
• Loaded weight: 6,770 kg (14,925 lb)
• Powerplant: 2 × BMW VI V12 engines, 373 kW (500 hp) each

Performance

• Maximum speed: 216 km/h (117 knots, 134 mph)
• Range: 1,200 km (648 nm, 746 mi)
• Service ceiling: 6,800 m (22,310 ft)
• Wing loading: 53 kg/m² (11 lb/ft²)
• Power/mass: 110 W/kg (0.07 hp/lb)
  
• Time to altitude: 12 min to 3,000 m (9,840 ft)
• Horizontal turn time: 26 sec
• Takeoff roll: 210 m (688 ft)
• Landing roll: 180 m (590 ft)

References

Wikimedia Commons has media related to Polikarpov TB-2.