Bratukhin B-5

The Bratukhin B-5 was a prototype Soviet twin-rotor transport helicopter designed by the Bratukhin aircraft design bureau.[1]

Bratukhin B-5
Role Transport helicopter
National origin Soviet Union
Manufacturer Bratukhin
First flight 1947
Number built 1 (B-5)
1 (B-9)
1 (B-10)
Variants Bratukhin B-11

DevelopmentEdit

The B-5 was an improved and larger design based on the bureau's earlier G-4, a twin-rotor helicopter, with each rotor driven by an Ivchenko AI-26 radial engine.[1] Each engine was housed in a pod on an outrigger with the related rotor above.[1] The programme was delayed waiting for appropriate engines and the B-5 was not completed until 1947, it only made a few short hops before the programme was abandoned due to vibration and structural flexing.[1][2]

An air ambulance variant, the Bratukhin B-9 was built but was abandoned without being flown.[2][3] Another variant was the Bratukhin B-10 which had uprated 575 hp (429 kW) engines and was modified for use in the artillery observation role with the military designation VNP (Vosdushnii Nabludatelnii Punk - Aerial Observation Point).[2] The B-10 had three-seat for the crew, the cabin could hold three passengers or equipment. The B-10 flew in 1947 but although it did not have the wing stiffness problems of the B-54, demonstrating adequate handling like the B-5 and B-9 was also abandoned.[2][3] A variant with an improved performance was built as the Bratukhin B-11.[2]

VariantsEdit

B-5
Prototype, one built.
B-9
Prototype air ambulance variant, one built.
B-10
Prototype observation and reconnaissance variant, one built.

Specifications (B-10)Edit

Data from [4]

General characteristics

  • Crew: 3
  • Capacity: 3 or additional equipment
  • Empty weight: 3,019 kg (6,656 lb)
  • Max takeoff weight: 3,900 kg (8,598 lb)
  • Powerplant: 2 × Ivchenko AI-26GVF) radial piston engine, 429 kW (575 hp) each
  • Main rotor diameter: 2× 10.00 m (32 ft 10 in)

Performance

  • Maximum speed: 218 km/h (135 mph, 118 kn)
  • Range: 440 km (270 mi, 240 nmi)

See alsoEdit

Related development

Related lists

ReferencesEdit

NotesEdit

  1. ^ a b c d Orbis 1985, p. 839
  2. ^ a b c d e Nemecek 1986, pp. 385-386
  3. ^ a b Gunston 1995, p.64.
  4. ^ Nemecek 1986, pp. 438-439

BibliographyEdit

  • Gunston, Bill (1995). The Osprey Encyclopedia of Russian Aircraft from 1875 - 1995. London: Osprey Aerospace. ISBN 1-85532-405-9.
  • Nemecek, Vaclav (1986). The History of Soviet Aircraft from 1918. London: Willow Books. ISBN 0-00-218033-2.
  • The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing.