Rotor collective pitch VS Mu to control flapping and...

Details Rotor collective pitch VS Mu to control flapping and... Rotor collective pitch VS Mu to control flapping and...

2005-11-16

2008-11-11

Mansen, Michael R. (Department: 3644)

Aeronautics and astronautics

Aircraft, heavier-than-air

Helicopter or auto-rotating wing sustained, i.e., gyroplanes

C244S006000, C244S008000, C244S017110, C244S017130

Reexamination Certificate

active

07448571

ABSTRACT:
A method of operating a rotor aircraft involves measuring an airspeed of the aircraft and a rotational speed of the rotor. A controller determines a Mu of the rotor based on the airspeed of the aircraft and the rotational speed of the rotor. The controller varies the collective pitch of the rotor blades in relationship to the Mu, from an inertia powered jump takeoff, through high speed high advance ratio flight, through a low speed landing approach, to a zero or short roll flare landing. In addition as the rotor is unloaded and the rotor slows down, the controller maintains a minimum rotor RPM with the use of a tilting mast.

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