Grigorovich TB-5

Grigorovich TB-5 (Russian: Григорович ТБ-5) was an experimental heavy bomber designed and tested in the Soviet Union in the early 1930s. Designed as a competitor for TB-3, TB-5 was intended to be powered by two FED 24-cylinder X engines of 746 kW (1,000 hp) each. When these were canceled, the underwing pods were revised to each house a pair of Bristol Jupiter engines in a push-pull configuration. Despite projected performance inferior to TB-3, it was hoped that TB-5 would gain an advantage by using less metal (in short supply at the time) thanks to its mixed construction of fabric-covered metal frame.[1]

TB-5
Role Heavy bomber
National origin Soviet Union
Designer Grigorovich
First flight 1 May 1931
Status Retired
Primary user Soviet Union
Number built One

Test flights began on 1 May 1931 with disappointing results, in part due to poor thrust of the rear-facing engines.[1] The prototype TB-5 was wrecked in a crash landing following the in-flight detachment of an engine in the spring of 1932,[2] and with the entry into service of the superior TB-3 that year, the TB-5 project was abandoned.[1]

Specifications (TB-5)
TB-5 at the Central aerodrome

Data from Shavrov 1985[1]

General characteristics

  • Crew: Six[3]
  • Length: 22.1 m (72 ft 6 in)
  • Wingspan: 31 m (101 ft 8 in)
  • Wing area: 150 m2 (1,600 sq ft)
  • Airfoil: root: TsAGI R-II (18%) ; tip: TsAGI R-II (12%)[4]
  • Empty weight: 7,483 kg (16,497 lb)
  • Gross weight: 12,535 kg (27,635 lb)
  • Powerplant: 4 × Bristol Jupiter V 9-cylinder air-cooled radial piston engines, 336 kW (451 hp) each in tandem nacelles
  • Propellers: 2-bladed variable-pitch propellers

Performance

  • Maximum speed: 180 km/h (110 mph, 97 kn)
  • Range: 2,600 km (1,600 mi, 1,400 nmi)
  • Wing loading: 84 kg/m2 (17 lb/sq ft)
  • Power/mass: 0.107 kW/kg (0.065 hp/lb)

Armament

  • Guns: Two turrets, each with 2× 7.62 mm (0.3 in) PV-1 machine guns
  • Bombs: Up to 2,500 kg (5,512 lb) of bombs
gollark: Eternally.
gollark: That might improve, but right now only a few things have hardware *de*code for it.
gollark: Anyway, given the total lack of AV1 hardware encoders regular people can buy, it isn't a very suitable replacement for H.264, which is the most common video codec basically everywhere.
gollark: (decode complexity suffers somewhat)
gollark: H.266 recently got standardized, which could be cool if they don't bee the licensing like with H.265, as it's faster to encode than AV1 but has greater bitrate savings.

See also

Aircraft of comparable role, configuration and era

References
  1. Shavrov V.B. (1985). Istoriia konstruktskii samoletov v SSSR do 1938 g. (3 izd.) (in Russian). Mashinostroenie. ISBN 5-217-03112-3.
  2. Gunston 1995, p. 91.
  3. Gunston 1995, p. 90.
  4. Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.
  • Gunston, Bill (1995). The Osprey Encyclopedia of Russian Aircraft 1875–1995. London: Osprey. ISBN 1-85532-405-9.
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