Patent ID: 7546976

Claim:
A dual power helicopter without a tail rotor comprising a cabin which is provided with at least one driving space; a power device installed in an interior of the cabin, which primarily provides an engine power, and a top end of which is connected with a clutch; a gear box set, including a main gear box and a left and right secondary gear boxes, with the main gear box being located at a top end of the clutch, the left and right secondary gear boxes being located at two sides of the main gear box respectively, the left and right secondary gear boxes being rotated in opposite directions through the main gear box, and outer casings of the left and right secondary gear boxes being freely rotated; two rotors which are located at a top end of the left and right secondary gear boxes respectively; a coupling lever set which includes a control lever and a plurality of coupling levers, with the control lever being installed in an interior of the cabin to be connected to the plurality of coupling levers which are connected to the outer casings of left and right secondary gear boxes, respectively.