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Tiltrotors



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.


1941

Focke-Achgelis Fa 269

Nazi tilt-rotor VTOL fighter project. Powered by a single radial engine buried behind the cockpit with a fixed wing and two tilt three-bladed rotors. Only a full-scale mock-up was built before allied bombing raids interrupt its development




1945

Platt and LePage

proposed and patented the first American tilrotor aircraft but the lack of capital caused the company to shut down in August of 1946




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 all used a whole tilt wing instead of a tilting engine design




1954

Transcendental Model 1G





August 23, 1955

Bell 200 [XH-33] XV-3


Starting built in 1953, this experimental aircraft featuring tilting wingtip rotor assemblies flew until 1966. The airframe returns to Texas in 2004





1969

Bell 300

Development Mock-up




May 3, 1977

Bell 301 XV-15

Started in 1972 under funding from NASA and the US Army. After three decades is continuing to be used as experimental testbeds.




1987

Bell/Boeing Pointer

An RPV tiltrotor, for research and development weighing 250kg: less than one per cent of the future V-22 Osprey

March 19, 1989

Bell/Boeing V-22 Osprey

First tiltrotor to enter in production



March 6, 1998

Bell 918 Eagle Eye

An unmanned aerial vehicle (UAV) for military use




1999

Bell Boeing Quad TiltRotor (QTR)

A proposed four-rotor derivative of the V-22 with a cargo capacity equivalent to a C-130 Hercules




March 6, 2003

Bell/Agusta BA609

Civilian six to nine passenger




2013

NASA's GL-10 Greased Lightning drone

With a ten-foot/6.7m wingspan and boasts ten electric engines all on tiltwings. With the wings pointed up, the drone take off and land like a helicopter. Once airborne, they'll tilt forward





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