First hover flight of the Nord 500 Cadet
Tuesday, July 23, 1968
The Nord 500 Cadet was a convertiplane built to test the viability of thrust control in hover and forward flight by duct flow management.
The flight, a tethered hover, was made by the second propotype aircraft. Only 2 prototypes were built (video courtesy of vlieger007 and YouTube).
Source: AHS V/STOL Wheel entry for this aircraft