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A rotorcraft having four symmetrically disposed intermeshing rotors coupled to a common drive unit, each rotor having a single blade which is formed with a lifting surface and an oppositely projecting balance arm. The four rotors are coupled to the drive unit by respective rotor shafts and the shaft

A rotorcraft having four symmetrically disposed intermeshing rotors coupled to a common drive unit, each rotor having a single blade which is formed with a lifting surface and an oppositely projecting balance arm. The four rotors are coupled to the drive unit by respective rotor shafts and the shafts are inclined with respect to one another such that the path surface traced by each blade is inclined with respect to the path surface traced by each other blade. Each rotor is connected to its associated rotor shaft by way of a universal joint which provides for torque transmission and which permits blade flapping and blade pitch adjustment, and actuators are provided for applying differential collective pitch to the rotors by way of pitch control shafts.

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A rotorcraft having four intermeshing rotors coupled to a common drive unit, each rotor comprising a single rotatable blade having a lifting surface and an oppositely projecting substantially non-lifting balance arm, the rotors being coupled to the drive unit by respective rotor shafts and the shaft

A rotorcraft having four intermeshing rotors coupled to a common drive unit, each rotor comprising a single rotatable blade having a lifting surface and an oppositely projecting substantially non-lifting balance arm, the rotors being coupled to the drive unit by respective rotor shafts and the shafts being inclined with respect to one another such that the path surface traced by each blade during rotation is inclined with respect to each other path surface, each rotor being connected to its associated rotor shaft by way of a mechanism which provides for torque transmission and which permits blade flapping and pitch adjustment, one diagonally positioned pair of the rotors being arranged to be driven so as to co-rotate in one direction and the other diagonally positioned pair of the rotors being arranged to be driven so as to co-rotate in the opposition direction, and means being provided for adjusting the pitch angle of each blade.