Bratukhin B-11
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The last design authorised from OKB-3 was to provide comparision against Mil and Yak single-rotor submissions to VVS requirement for a three-seat all-weather communications helicopter. Dynamic parts were as previous Bratukhin except for hydraulic rotor-hub dampers and faired masts with oil-cooler inlets. Wing of lifting section are set at zero incidence. The fuselage had improved form, with round instead of polyhedral top and bottom. The tail was basically as the B-5. The pilot was in B-5 type nose, main cabin for two seats, with space at rear for freight ot two stretchers (in lieu of passengers) loaded through enlarged door. Improved differential rotor controls with reduced friction were fitted. The B-11 was equipped for blind flight.
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