A helicopter pilot might have made such a hard maneuver to avoid an obstacle like a bird or a drone, or in an attempt to make the ride more thrilling for sightseers, Brauchle said. Once the rotor ...

The sightseeing helicopter plummeted into the Hudson River after its rotor blade detached from the main body of the aircraft ...

Rotor assistance in walking experiments improved stability, reducing pitch variations (-3° to 1°) and achieving a maximum ...