Helicopter rotors

Details Helicopter rotors Helicopter rotors

1976-09-30

1978-03-21

Powell, Jr., Everette A.

Fluid reaction surfaces (i.e., impellers)

Sustained ancillary movement of rotary working member

Lead-lag type rotor blade movement

416138, 416141, B64C 2738

Patent

active

040800989

ABSTRACT:
This invention relates to helicopter rotors having three or more blades and of the type having a hollow rotor drive shaft and a control column positioned within the hollow shaft arranged to support a spider assembly at its upper end through which control movements are transmitted to the rotor. In the present invention, the inner ends of at least two of the arms of the spider are retained in fixed relationship and the outer end of each arm is connected to its respective feathering hinge through a vertical pivot located on an axis at an operational radius not greater than a radius of a point about which blade lead/lag movements occur. This arrangement serves to establish a virtual floating fulcrum about which the control column is tilted during operation to impart control movements, and thereby eliminates the complicated mechanical support means that are a feature of prior rotors of this type.

REFERENCES:
patent: 2418030 (1947-03-01), Hirsch
patent: 2557338 (1951-06-01), Caldwell
patent: 2677429 (1954-05-01), Laufer
patent: 2692650 (1954-10-01), Pullin et al.
patent: 3026942 (1962-03-01), Cresap
patent: 3484172 (1969-12-01), Reed
patent: 3926536 (1975-12-01), Ciastula et al.
patent: 4021141 (1977-05-01), Watson

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