A tiltrotor aircraft combines the vertical lift capability of a helicopter
with the speed and range of a turboprop airplane.
Their two engines,
which tilt on the wings, move the "proprotors"
in a counterotating way to counteract the torque of the body.
1945
Platt and LePage
proposed and patented the first tilrotor aircraft
1950s - 1960s
Many convertiplanes were built, including the
Vertol 76 (1957),
Hiller X-18 (1959),
LTV XC-142 (1964),
Curtiss-Wright X-19 (1963),
Canadiar CL-84 Dynavert (1965, picture)
and the Nord 500 (1967).
They use a whole tilt wing instead of a
tilting engine design
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