Fluid reaction surfaces (i.e. – impellers) – Sustained ancillary movement of rotary working member – Responsive to fixed actuator
Patent
1976-12-09
1979-02-13
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Sustained ancillary movement of rotary working member
Responsive to fixed actuator
416140, 416141, B64C 2772
Patent
active
041393317
ABSTRACT:
A helicopter rotor assembly comprises a rotor including a rotor boss and a rotor cup in, and coaxial with, said boss, a plurality of rotor blades each having an integral rigid spindle connecting the blade to the rotor with the spindle axes intersecting at the axis of rotation of the rotor and with the blades being inclined upwardly from the rotor. Articulated joints connect the spindles with the boss and further articulated joints connect the spindles with the cup. The blades are rotatable about the spindle axes and control means is provided for lifting and lowering the rotor boss relative to the cup to vary the inclination of the blades. According to a preferred feature, the axis of each spindle forms an angle with the line of focus of each respective blade which line of focus is located behind the spindle axis relative to the direction of rotation of the blade and the apex of this spindle blade angle is spaced from the rotor boss rotation axis by an amount such that flexural couples in the plane of the blade produced during rotation of the rotor are cancelled out by centrifugal force.
REFERENCES:
patent: 2233747 (1941-03-01), Riedl
patent: 2519762 (1950-08-01), Hoffmann et al.
patent: 2557338 (1951-06-01), Caldwell
patent: 2677429 (1954-05-01), Laufer
patent: 2689616 (1954-09-01), Nagler
patent: 3303888 (1967-02-01), Wolf
patent: 3310119 (1967-03-01), Watson
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