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Sikorsky S-69

From PlaneSpottingWorld, for aviation fans everywhere
Sikorsky S-69/XH-59 with auxiliary turbojets
Type Experimental helicopter
Manufacturer Sikorsky Aircraft
Maiden flight July 26 1973
Primary users NASA
United States Army
United States Navy
Number built 2

The Sikorsky S-69 was an experimental compound co-axial helicopter developed as part of the Advancing Blade Concept (ABC) program.

Sikorsky S-69

Also known by the military designation XH-59A, the S-69 was part of the Advancing Blade Concept (ABC) program.[1] This Advancing Blade Concept system consisted of two rigid, contra-rotating rotors which made use of the aerodynamic lift of the advancing blades. At high speeds, the retreating blades were offloaded, as most of the load was supported by the advancing blades of both rotors and the penalty due to stall of the retreating blade was thus eliminated. This system did not even require a wing to be fitted for high speeds and to improve manoeuvrability, and also eliminated the need for an anti-torque rotor at the tail.[2]

Specifications (S-69)

Data from U.S. Army Aircraft Since 1947[3], Website[2]

General characteristics



  1. Michael J Taylor: The Illustrated Encyclopedia of Helicopters, page 20. Exeter Books, New York, NY USA, 1984. ISBN 0-671-07149-1
  2. 2.0 2.1 Sikorsky S-69 / XH-59. Retrieved on 2007-6-21.
  3. Harding, Stephen (1997). U.S. Army Aircraft Since 1947. Atglen, PA, USA: Schiffer Publishing Ltd., 251. ISBN 96-69996. 

External links

See also

Related development

Comparable aircraft

Designation sequence

Related lists

Template:USAF helicopters Template:Sikorsky Aircraft

ja:S-69 (航空機)

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Sikorsky S-69".