US 12,116,119 B2
High speed rotor blade design
Byung-Young Min, Trumbull, CT (US); Vera Klimchenko, Silver Spring, MD (US); Annie Gao, Norwalk, CT (US); Alexander F. Dunn, Easton, CT (US); Claude George Matalanis, Monroe, CT (US); and Brian Ernest Wake, Monroe, CT (US)
Assigned to LOCKHEED MARTIN CORPORATION, Bethesda, MD (US)
Filed by LOCKHEED MARTIN CORPORATION, Bethesda, MD (US)
Filed on Mar. 28, 2022, as Appl. No. 17/706,531.
Prior Publication US 2023/0322373 A1, Oct. 12, 2023
Int. Cl. B64C 27/46 (2006.01); B64C 27/467 (2006.01); B64C 27/473 (2006.01)
CPC B64C 27/467 (2013.01) [B64C 27/473 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A rotor blade of a rotor blade assembly, the rotor blade comprising:
a blade root;
a blade tip; and
a blade body extending from the blade root to the blade tip and comprising a leading edge and a trailing edge, the blade body defining a feathering axis, wherein
the leading edge and the trailing edge each include a first portion that extends toward a first direction and a second portion that extends toward a second direction opposite the first direction,
a local twist angle of the rotor blade is approximately 9.15 degrees throughout a first zero gradient region in the range of approximately r/R=0.0 to r/R=0.2, where R is a radius of the rotor blade measured along the feathering axis from the blade root to the blade tip and r is a radial location measured from the blade root along the feathering axis, and
at a given radial location along the feathering axis in the direction that r/R is increasing, (i) a chord length extending from the leading edge to the trailing edge is decreasing in value from a first chord length, (ii) a distance between the trailing edge and the feathering axis is decreasing in value from a first distance, and (iii) the first portion of the leading edge is extending further in the first direction.