The compound helicopter also had two low-mounted stub wings that during high speeds provided lift as increased trust was produced by the pusher propeller reducing the lift needed by the main rotor.

As a next-generation compound helicopter, it promised to replace the Black Hawk with advanced technology. Despite its impressive capabilities, it ultimately lost out to Bell’s V-280 Valor in the ...

When that happens, the helicopter rolls off to the retreating blade side and the pilot can no longer control it. Sikorsky’s X2 is a compound helicopter (see “Hot Rod Helicopters,” Sept.

Hover over the red squares to read more about the UH-60 Black Hawk heliocopter and the downed helicopter used in the raid on Osama bin Laden's compound (right). Photos of the wreckage of one of ...