Sikorsky S-69

S-69/XH-59
Sikorsky S-69/XH-59A with auxiliary turbojets
General information
TypeExperimental compound helicopter
National originUnited States
ManufacturerSikorsky Aircraft
Primary usersNASA
Number built2
History
First flightJuly 26, 1973
Retired1981

The Sikorsky S-69 (military designation XH-59) is an American experimental compound helicopter developed by Sikorsky Aircraft as the demonstrator of the co-axial Advancing Blade Concept (ABC) with United States Army and NASA funding.

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