Patent ID: 8337156
Filing Date: 2012-12-25
Classification: B64C

Abstract:
1. An extended speed range flight method, using thrust vectoring propellers comprising; providing at least for two counter-rotating propellers with alterable blade setting angle and setting propeller axes along a flight direction; establishing generating a force perpendicular to the propeller axes and increasing that force together with increasing airspeed and an angle of the propeller axis relative to the direction of the airflow; achieving the speed at which a magnitude of the force approaches the weight of aircraft and ensuring that the propeller axes are sufficiently offset upwardly to create a lifting force needed for flight; upon reaching the airspeed no less than 50 m/s, slowing down the propeller and setting its relative propeller speed V increasing φ cyclically varying a pitch angle of the blades to create a maximal blade pitch angle difference between the blades at a first half-turn between 60° and 120° and at a second half-turn between 240° and 300° of each propeller in order to create forces perpendicular to the propellers' axes in a determined direction and control magnitudes of the forces, to vary a difference between maximal and minimal pitch angles during a blade turn of each propeller, and to control a direction and value of the force created by the propellers as well as a lifting force, thrust or a deceleration force during cruising or maneuvering of the flight.