Definition
An aircraft that combines vertical takeoff and landing (VTOL) capability with the forward-flight performance of a fixed-wing airplane by mounting large rotors on the ends of its wings that can pivot. The rotors tilt upward to act as helicopter-style rotors for hover and vertical flight, then tilt forward to act as propellers for cruise flight on the wings.
Plain English
An aircraft with rotors at the wingtips that point up to take off and land like a helicopter, then tilt forward so it can fly like an airplane.
Context Anchor
Seen when discussing airport categories and the types of aircraft an airport may be designed or approved to handle.
Derivation
Tilt comes from Old English, meaning to tip or lean. Rotor is short for rotator, from Latin rotare, to turn. Together the term simply describes the defining feature: a turning rotor that tips between two positions.
Why Pilots Care
Tilt rotors operate from both runways and helipads, so pilots and controllers may share airspace and ground facilities with them. They have unique performance characteristics — slower than airplanes, faster than helicopters — and transition between flight modes, which affects sequencing, separation, and wake turbulence considerations.
Intuition Check
Do not read this as just “a helicopter with tilted blades.” The important point is that the whole rotor system changes angle so the aircraft can shift between helicopter-like lift and airplane-like forward flight.
Example Sentence 1
The V-22 Osprey is a tilt rotor aircraft used by the military for missions that require both vertical takeoff and long-range cruise flight.
Example Sentence 2
Controllers cleared the tilt rotor aircraft for a steep approach that avoided the main runway traffic pattern.