Sikorsky Aircraft Corporation

David A Darrow

Frank Paul D'Anna

Stephen V Poulin

Lance Halcom

Frederick J Miner

Ron William Waldo

Richard Thomas Hood

Joshua Richards

Kristopher Michael Haydel

A box frame hub arm structure is provided and includes a body having an outboard surface, which is disposable to abut with an inboard surface of an outboard arm of an aircraft rotor head, and lead/lag sides. The body is formed to define a first cavity, an aperture communicative with the first cavity through the outboard surface and second and third cavities. The second and third cavities extend outwardly in opposite lead/lag directions from the first cavity to the lead/lag sides.

Rigid rotor head with tension torsion (TT) strap retention

A tension torsion strap by which a blade is connectable with a hub of a propulsor is provided. The tension torsion strap includes an elongate body formed to define attachment features at opposite ends thereof, the attachment features being connectable to the blade at one of the opposite ends and to the hub at the other of the opposite ends, fibrous materials extending along the elongate body and around the attachment features and pretension flanges elastically interposable between the hub and the elongate body. The pretension flanges are configured to maintain pretension in the fibrous materials above a predefined pretension level when the attachment features are connected to the blade and the hub.

Tension torsion strap

Growing community of inventors

Mesa, AZ, United States of America

David A Darrow