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Technical Note: Twin Rotor Hover Performance

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During 1947, Mr. Wieslaw Z. Stepniewski conducted a milestone model test that determined the influence on hover performance when co‐planar, twin rotors are overlapped. The original thrust and power data was, however, given very limited distribution in 1948. This data, in tabulated form, has been recovered from the archives and included in this technical note. The experimental results provide a valid data base for future theory versus test correlation. In addition, the “psuedo ideal” performance of co‐planar, twin rotors is given using blade element‐momentum theory and assuming constant chord blades twisted as θ(x) = θtip/x. An engineering approximation to rapidly calculate co‐planar, twin rotor hover performance for any overlap ratio and at practical rotor loading is offered.

Document Type: Research Article


Affiliations: F. D. Harris & Associates, Fountain Hills, Arizona

Publication date: 1999-01-01

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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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