Helicopter engines 38,48,68 developed consistent with the basic models of helicopters. Engines equipped with a special crankshaft, a helicopter equipped with an enlarged head area of cooling and carburetor with extended throttle lever. Are not equipped with silencers.
Model aircraft engines come complete with silencer, which is attached to the exhaust flange of the engine.
Trials and testing of ship thrusters perform champions Russia in ship modeling Kotov RY and Yamshchikov DA