Blade pitch control mechanism for helicopters

Details Blade pitch control mechanism for helicopters Blade pitch control mechanism for helicopters

1976-03-22

1977-09-13

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Sustained ancillary movement of rotary working member

Responsive to fixed actuator

416129, 416168R, B64C 2710

Patent

active

040478386

ABSTRACT:
Pitch control linkage for the upper rotor of coaxial counterrotating rotors utilizes conventional swashplate, control rod and servomotor elements for changing blade pitch but without the conventional rotating and non-rotating scissors for reacting swashplate torque. This is accomplished by the use of rotating and non-rotating walking beams and combination torque reacting control rods between the walking beams and the rotatable and non-rotatable swashplate elements. Means are also disclosed for shimming the rotatable walking beams to achieve pre-track adjustment of the pitch of individual blades.

REFERENCES:
patent: 2271473 (1942-01-01), Bennett
patent: 2540543 (1951-02-01), Neville
patent: 2629570 (1953-02-01), Carnahan
patent: 2829721 (1958-04-01), Gebhard
patent: 3486832 (1969-12-01), Stone et al.

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