Tail rotor control cable-pylon fold accommodation

Details Tail rotor control cable-pylon fold accommodation Tail rotor control cable-pylon fold accommodation

1979-02-15

1981-01-20

Frankfort, Charles E.

Aeronautics and astronautics

Aircraft, heavier-than-air

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

74 8922, 244 1721, 244 49, 244120, B64C 2704, B64C 2750

Patent

active

042458013

ABSTRACT:
A helicopter has main rotor blades foldable over its tail cone and a tail rotor pylon which is foldable about a tail cone vertical hinge from its fore-and-aft flight position through an angle approaching 180.degree. to lie alongside the tail cone. Tail rotor pitch control mechanism includes a cable which extends across the foldable hinged members, direction change pulleys for the cable and an improved 4-bar linkage system which controls the movement of the pulleys within a small envelope circle and maintains a constant tension on the cable throughout the full fold cycle.

REFERENCES:
patent: 3116896 (1964-01-01), Sigler et al.
patent: 3142459 (1964-07-01), Baetke
patent: 3744742 (1973-07-01), Gear
patent: 3901464 (1975-08-01), Arnstein et al.
patent: 3921938 (1975-11-01), Jupe et al.

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