Testing advanced technologies for future designs, in 1965 Boeing Vertol modified a Bv-107II as a concept demonstrator with four stub wings among other innovations.
The CH-47A c/n 164 was also modified as an advanced-technology demonstrator, named Model 347, with an extended fuselage, an aft pylon, four-blade rotors, retractable landing gear and a computer controlled variable angle of attack wing. First flew on May 27, 1970. This unique experimental aircraft was used as a test bed for various concepts and components to be used in the future Heavy Lift Helicopter (HLH) Program ( XCH-62 ).
The Model 347 is preserved at the US Army Aviation Museum at Fort Rucker. US Army Serial number 65-7992.
The CH-47A c/n 164 was also modified as an advanced-technology demonstrator, named Model 347, with an extended fuselage, an aft pylon, four-blade rotors, retractable landing gear and a computer controlled variable angle of attack wing. First flew on May 27, 1970. This unique experimental aircraft was used as a test bed for various concepts and components to be used in the future Heavy Lift Helicopter (HLH) Program ( XCH-62 ).
The Model 347 is preserved at the US Army Aviation Museum at Fort Rucker. US Army Serial number 65-7992.
List of Operators of 347 |
Construction Numbers |
| C/N | Built as | Year | History | |
|---|---|---|---|---|
| 10 | 107-ii | 1962 |   04064,N6679D | |
| b-164 | ch-47a | 65-07992 | ||
