Dornier Do 29

The Dornier Do 29 was an experimental aircraft, in the 1950s, with which short take-off and landing (STOL) was to be experimented with by means of inclined propellers.In the Do 29, the two Lycoming O-480 engines were mounted in a pusher configuration inside sub-wing nacelles and each drove a three-bladed propeller that could be inclined downwards to an angle of 90°.Despite the fact that the prototypes achieved their objectives, the Do 29 project was cancelled. source wikipedia