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Bratukhin B-5
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The Bratukhin B-5 was a prototype Soviet twin-rotor transport helicopter designed by the Bratukhin 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 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 variant was built as the Bratukhin B-11.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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