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The ABC Helicopter

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Presented is an introduction to the basic principles of the Advancing Blade Concept (ABC) rotor and a review of the related experimental and analytical research conducted in support of the Sikorsky ABC helicopter program. The ABC helicopter is comprised of two coaxial, counter‐rotating rotors having blades rigidly attached to the hub except for feathering freedom. The blades are significantly stiffer than conventional rotor Blades and are capable of supporting large moments without excessive tip deflections. Improved forward flight efficiency and the elimination of retreating blade stall results from the ability of the ABC rotor to utilize to a large extent the lifting potential of the advancing blades—a capability not present in conventional single rotors. Results of various small‐scale wind tunnel experiments are presented along with summaries of several analytical investigations which were conducted to provide information concerning rotor performance, blade dynamics, vibration, and stability and control
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Document Type: Research Article

Affiliations: Rotary Wing Technology Group, Fluid Dynamics Laboratory, United Aircraft Research Laboratories, East Hartford, Connecticut

Publication date: 1969-10-01

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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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