The Sikorsky UH-60 Black Hawk helicopter was thrust to the forefront of aviation last week when a U.S. Army-operated Black Hawk collided with American Airlines Flight 5342 in the airspace above ...

Helicopter? Close, but not quite, since the rotor blades are fixed-pitch. We’ll just go with “monocopter” for now and sort out the details later for this ducted-fan, thrust-vectored UAV.

The system allows the pilot to apply forward or reverse thrust throughout the flight envelope. This way, the aircraft can accelerate from a hover like a conventional helicopter, engage the pusher ...