The Bratukhin B-5 was a prototype

Soviet The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

helicopter A helicopter is a type of rotorcraft in which Lift (force), lift and thrust are supplied by horizontally spinning Helicopter rotor, rotors. This allows the helicopter to VTOL, take off and land vertically, to hover (helicopter), hover, and ...

Bratukhin Bratukhin, or OKB-3, was a Soviet aircraft design bureau created in 1940 from within TsAGI to develop helicopters. Headed by Ivan Pavlovich Bratukhin, the bureau built several experimental helicopters over the next decade. Each model had the same b ...

aircraft design bureau.

Development

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 The Ivchenko AI-26 is a seven-cylinder air-cooled radial engine used in early Soviet helicopters and later used in light utility aircraft. Design and development The AI-26 engine was designed by A.G Ivchenko in 1945 with the early designation M ...

radial engine. Each engine was housed in a pod on an outrigger with the related rotor above. 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. An air ambulance variant, the Bratukhin B-9 was built but was abandoned without being flown.Gunston 1995, p.64. 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). 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. A variant with an improved performance was built as the

Bratukhin B-11 The Bratukhin B-11 was a prototype Soviet twin-rotor transport helicopter and the last design of the Bratukhin Bratukhin, or OKB-3, was a Soviet aircraft design bureau created in 1940 from within TsAGI to develop helicopters. Headed by Ivan Pavl ...

Variants

;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)

References

Notes

Bibliography

* * * {{refend 1940s Soviet military utility aircraft Military helicopters Abandoned military aircraft projects of the Soviet Union

B-5 B5, B05, B-5 may refer to: Biology * ATC code B05 (''Blood substitutes and perfusion solutions''), a therapeutic subgroup of the Anatomical Therapeutic Chemical Classification System * Cytochrome ''b''5, ubiquitous electron transport hemoproteins ...