Patent ID: 7168656

Claim:
A light weight helicopter comprising: a rotary wing unit having an engine with a primary gearbox being connected through a flexible coupling and a centrifugal clutch to a secondary gear box, said engine, said primary gearbox and said secondary gearbox being mounted below a horizontal keel post using mounting means, said keel post being rigidly attached to a triangular control frame, a base portion of which forms a control bar, said keel post being fixed to a fuel tank and being connected to said engine, said keel post being also provided with a tail plane having one or more articulated vertical flaps capable of being articulated by cable means, said secondary gearbox being provided with a freewheeling clutch, pinion gear and bevel gears capable of transmitting the rotary movement of said engine to two contra-rotating vertical concentric shafts each of which being fixed by a pitch bearing on teetering plates and teetering hinges to horizontal rotors, said horizontal rotors having at least two rotor blades of airfoil cross section capable of pitch change through rotary movement of a pitch horn, said pitch horn on each rotor blade being connected to a star and turnbuckle mechanism and a stationary control fork, said rotary wing unit being attached to a tricycle assembly through a landing gear and provided with means for control of the said engine, rotors, tail plane and landing gear, said tricycle assembly having a triangular frame composed of a rear beam, a horizontal beam and a front tube, said horizontal beam supporting a front fork in a pivot, said front fork being provided with footrest for the pilot, said front fork being attached to cables linking to said articulated vertical flap, such that the rotation of said front fork results in the hinge movement of said articulated vertical flap, said horizontal tube also supporting a plurality of landing gear tubes, which are kept in position through tensioned cables, said landing tubes and the front fork supporting landing gear, the pilot being seated in a seat fixed on the said horizontal beam and secured firmly to the seat through seat belts.