ULTRALIGHT COAXIAL ROTOR AIRCRAFT

摘要

An ultralight coaxial dual rotor helicopter (10) having a substantially L shaped frame (12). Attached to the back of the frame is a vertical shaft engine, and a pair of yaw paddles (30, 32) for controlling yaw of the craft. The drive shaft (22) connects to a belt drive at the top of the frame, which transmits the engine power to a transmission and coaxial drive gear for driving the rotors (16). Crank actuators are provided for tilting the rotor axis to control the pitch and roll of the craft. A pilot seat (34) and ballast tank are attached to the front of the frame. The ballast tank (48) may be filled with a volume of water to balance the craft for the weight of the pilot. The fuel tank (56) is located behind the pilot seat (34) on the centerline of the helicopter, such that as fuel is used and the weight of fuel in the tank changes, the balance of the craft will not be affected. A simplified electronic control system controls all functions of the helicopter in response to pilot input.