Rotor for rotary wing aircraft

Details Rotor for rotary wing aircraft Rotor for rotary wing aircraft

1998-01-08

2000-02-15

Poon, Peter M.

Aeronautics and astronautics

Aircraft, heavier-than-air

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

B64C 2752

Patent

active

060243252

ABSTRACT:
A rotor for rotary wing aircraft has a tip to tip flex-beam spar and torsionally stiff hollow blades bonded to the spar throughout the tip-most portion of the blades. The spar spaced-apart spar caps which have a dual beam cross section in the region not bonded to the blades so that the spar is twistable for pitch control. The rotor spindle and controls pass through a central hole between the spar caps. An intermediate section of the rotor has shear webs bonded above and below spaced-apart spar caps, providing a stiff box beam cross section. The spar caps join each other outboard of the intermediate section. The collective control for pitch change employs a coil spring mounted between a pitch horn and a hub.

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