US 11,884,387 B2
Rotor assembly connectable to rotor hub and having pitch control
Pedro L Cabrera, West Haven, CT (US); David H. Hunter, Cheshire, CT (US); and David N. Schmaling, Southbury, CT (US)
Assigned to LOCKHEED MARTIN CORPORATION, Bethesda, MD (US)
Filed by LOCKHEED MARTIN CORPORATION, Bethesda, MD (US)
Filed on Dec. 21, 2021, as Appl. No. 17/558,191.
Prior Publication US 2023/0192280 A1, Jun. 22, 2023
Int. Cl. B64C 27/32 (2006.01); B64C 27/10 (2023.01); B64C 27/72 (2006.01)
CPC B64C 27/32 (2013.01) [B64C 27/10 (2013.01); B64C 27/72 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A rotor assembly connectable to a rotor hub configured to rotate about a center axis, the rotor assembly comprising:
a blade comprising
a torsional pitch member coupled to the rotor hub;
a torque tube coupled to the torsional pitch member, wherein the torsional pitch member extends away from the center axis through a portion of the torque tube; and
a blade spar coupled to the torque tube; and
a pitch control member coupled to the torque tube and configured to control a pitch angle of the blade, the pitch control member being configured to apply a torsional force to the torque tube to control the pitch angle of the blade,
the torsional pitch member includes a first curvilinear channel and a second curvilinear channel each having a front side and a back side, wherein the first curvilinear channel and the second curvilinear channel are disposed adjacent to each other, such that the back side of the first curvilinear channel faces the back side of the second curvilinear channel.