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The YUH‐61A Tail Rotor: Development of a Stiff Inplane Bearingless Flexstrap Design

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The Boeing Vertol YUH‐61A tail rotor is a new, completely bearingless flexstrap design which uses fiberglass composite blades and straps to achieve significant gains in simplicity and survivability. This paper describes the design process by which such gains were made, with emphasis an new approaches used to assure aeroelastic stability. The discussion covers theoretical methods, reduced‐scale model testing, full scale isolated rotor testing, and testing on the prototype aircraft.This rotor is unique in incorporating blade sweep and tip weight to achieve flap‐lag stability in a “stiff inplane” design (first inplane modal frequency above one per rev). These features provide stability by improving flap‐lug couplings, making it unnecessary to separate the frequencies of the flap and inplane modes to avoid flap‐lag instability. The resulting freedom of modal placement yields valuable design benefits.
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Document Type: Research Article

Affiliations: Boeing Vertol Company, Philadelphia, Pennsylvania

Publication date: 1978-04-01

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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