Photograph: Photograph: The Bell XV-15 is a pioneering tiltrotor aircraft that is now being used to shape the design of the Bell Boeing 609. Typical descriptions of tiltrotors compare the aircraft to helicopters on the one hand, and turboprops on the other. But helicopters and turboprops just represent the endpoints of the spectrum of tiltrotor capabilities. It's the continuum of ``hybrid'' operations that connects those endpoints that really makes tiltrotors unique. The key ...


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