COMPOUND QUADCOPTER
Background of the Invention
This invention relates to a compound quadcopter which enables it to fly faster than the conventional helicopters/quadcopter. Further, it can perform all the operations that of a conventional helicopter. The concept includes 4 rotors (4, 5, 6 & 7) and 2 fixed wings(2 & 3) on starboard (2) and port (3) sides of a fuselage. 2 rotors (4 & 5) among 4 are embedded onto the starboard and port wings 1 each and the other two (6 & 7) are mounted at fore (6) and aft (7) of the fuselage (1).

Summary of the Invention

To establish a hovering flight all rotors (4, 5, 6 & 7) are in operation in a horizontal plane for vertical thrust to lift and hold the quad-copter. To enable the forward flight the rotors (4 & 5) embedded in the wings turn up to 90° about lateral axis to tilt the thrust vector in flight direction to overcome the drag to achieve the desired speeds. The other two rotors (6 & 7) maintain their thrust remain vertical to hold the altitude and required climb.

The rotors mounted at fore (6) and aft (7) of fuselage (1) tilt up to 90° about longitudinal axis to enable the sideward flight and the climb in the respective direction. The turns can be achieved through the differential thrust of two corresponding rotors. For example, the two rotors embedded in the wing help to achieve the spot turn by the difference in thrust production in the horizontal plane. Similarly fore and aft rotors can also be used.

Tilting the rotors is analogous to the longitudinal and lateral cyclic in the helicopter operation. Increase and decrease in thrust is analogous to collective in helicopter case.
Compound Quadcopter Parts List
1.Fuselage
2.Starboard wing
3.Port wing
4.Rotor embedded into starboard wing
5.Rotor embedded into port wing
6.Rotor mounted fore of thefuselage
7.Rotor mounted aft of the fuselage
8.Cockpit windshield
9.Starboard side engine
10.Port side engine