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- Type of vertical takeoff aircraft with rotors
- on its wings that spin horizontally for
- takeoff, but tilt to spin in a vertical plane
- for forward flight. At takeoff it looks like
- a two-rotor helicopter, with both rotors
- facing skywards. As forward speed is gained,
- the rotors tilt slowly forward until they are
- facing directly ahead. There are several
- different forms of convertiplane. The
- LTV-Hillier-Ryan XC-142, designed in the USA,
- had wings, carrying the four engines and
- propellers, that rotated. The German VC-400
- had two rotors on each of its wingtips.
- Neither of these designs went into
- production. A recent Boeing and Bell design,
- the Osprey, uses a pair of tilting engines,
- with propellers 11.5 m/38 ft across, mounted
- at the end of the wings. It is
- intended eventually to carry about 50
- passengers direct to city centres. The design
- should also be useful for search and rescue
- operations and for transport to offshore oil
- rigs.
-