Aeronautics and astronautics – Aircraft – heavier-than-air – Helicopter or auto-rotating wing sustained – i.e. – gyroplanes
Patent
1990-05-07
1992-08-11
Peters, Jr., Joseph F.
Aeronautics and astronautics
Aircraft, heavier-than-air
Helicopter or auto-rotating wing sustained, i.e., gyroplanes
244 38, 244 7C, 244123, 416134A, 416148, B64C 348, B64C 1112, F04D 2936
Patent
active
051372282
ABSTRACT:
A controllable lifting rotary wing for an aircraft wherein each rotor blade is of torsionally flexible construction and control may be accomplished by twisting the rotor blades. The root end of each blade is mounted to a central hub by means which allow both beamwise flapping and blade twist. The blade root mounting angle may be either variable or fixed. The blade twists uniformly from this root angle to a variable tip angle. Twist of the rotor blades is accomplished through the mechanism of shear flows. Blade twist angle may be automatically established by a balance of dynamic forces on the blade which cause twist angle to increase as root mounting angle is increased. Alternatively, blade twist angle may be manually controlled also. A unique feature of the torsionally flexible blade is that it is hollow throughout its entire span so it is well suited for ducting gases through the interior of the blade to tip-mounted jet propulsion units if desired.
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Mojica Virna Lissi
Peters Jr. Joseph F.
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