Technical data
Type B-11
Function Liaison
Year 1948
Crew 3
Engines 2*400/575hp AI-26GRF
Rotor diameter 2*10.0m
Length ?
Width (with rotors)?
Empty weight 3398kg
Loaded weight 4150kg
Rotor (disk) load 26.4
Power load (kg/hp) 3.7
Maximum Speed 155km/h
Static Ceiling -
Dynamic Ceiling 2550m
Range 328km
Seats (1-3)

B-11, OKB-3/ MAI I.P.Bratukhin

The B-10 helicopter. 16k b/w photo from the "History of aircraft construction in the USSR" Vol.2, p.439

Aerodynamically refined development of the B-10. B-11 was equipped for blind flight. Rotor manipulation system was also more advanced. Cargo section in the central fuselage had a big side door, could be used also to house one patient on ladder and a doctor.

Flight tests of the first B-11 started in June 1948, the second one - in September. Tests include flight up to 47 minutes with only one engine running. Some vibrations were observed on the maximum speed. Wide research program started, involving recording of vibrations. During those tests one rotor blade broke out (unhappy coincidence of manufacturing defect and minor design error), pilot K.I.Ponomarev was killed in a crash.

After several modification, including installation of new engines (same series), it was presented on an Aviation Parade. Unfortunately, the favored scheme of twin-rotor helicopter became "The Flying Banana" (due to less drag), and the transversal scheme was not used until the enormous Mi-12 came to live.

Predecessor: B-10;

Sources [6], Vol.2 p.438;

Modified March 28, 1997 Back to
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