| S-69/XH-59 | |
|---|---|
 Sikorsky S-69/XH-59A with auxiliary turbojets | |
| General information | |
| Type | Experimental compound helicopter |
| National origin | United States |
| Manufacturer | Sikorsky Aircraft |
| Primary users | NASA |
| Number built | 2 |
| History | |
| First flight | July 26, 1973 |
| Retired | 1981 |
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.