page_title: Tiltrotor
hierarchical_section_title: Tiltrotor
caption_attribution_description: English: Atlantic Ocean (Dec. 6, 2006) - A U.S. Marine Corps V-22 Osprey helicopter practices touch and go landings on the flight deck of the multipurpose amphibious assault ship USS Wasp (LHD 1). Wasp is in transit to Norfolk, Va., after visiting Philadelphia, Pa., for the Army-Navy football game. U.S. Navy photo by Mass Communication Specialist 2nd Class Katie Earley (RELEASED)
context_page_description: A tiltrotor is an aircraft which generates lift and propulsion by way of one or more powered rotors mounted on rotating shafts or nacelles usually at the ends of a fixed wing. Almost all tiltrotors use a bicopter design with two transverse rotors, with a few exceptions that use other layouts.
  Tiltrotor design combines the vertical lift capability of a helicopter with the speed and range of a conventional fixed-wing aircraft. For vertical flight, the rotors are angled so the plane of rotation is horizontal, lifting the way a normal helicopter rotor does. As the aircraft gains speed, the rotors are progressively tilted forward, with the plane of rotation eventually becoming vertical. In this mode the rotors provide thrust as a propeller, and the fixed wings provide the lift generated from the forward motion of the entire aircraft. Since the rotors can be configured to be more efficient for propulsion and it avoids a helicopter's issues of retreating blade stall, the tiltrotor can achieve higher speeds than helicopters.
  A tiltrotor aircraft differs from a tiltwing in that only the rotor pivots rather than the entire wing.
context_section_description: A tiltrotor is an aircraft which generates lift and propulsion by way of one or more powered rotors (sometimes called proprotors) mounted on rotating shafts or nacelles usually at the ends of a fixed wing. Almost all tiltrotors use a bicopter design with two transverse rotors, with a few exceptions that use other layouts.
  Tiltrotor design combines the vertical lift capability of a helicopter with the speed and range of a conventional fixed-wing aircraft.  For vertical flight, the rotors are angled so the plane of rotation is horizontal, lifting the way a normal helicopter rotor does.  As the aircraft gains speed, the rotors are progressively tilted forward, with the plane of rotation eventually becoming vertical.  In this mode the rotors provide thrust as a propeller, and the fixed wings provide the lift generated from the forward motion of the entire aircraft.  Since the rotors can be configured to be more efficient for propulsion (e.g. with root-tip twist) and it avoids a helicopter's issues of retreating blade stall, the tiltrotor can achieve higher speeds than helicopters.
  A tiltrotor aircraft differs from a tiltwing in that only the rotor pivots rather than the entire wing.  This method trades off efficiency in vertical flight for efficiency in STOL/STOVL operations.
caption: The Bell Boeing V-22 Osprey
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