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An early helicopter, the Autogiro G-ACIN. Date: circa 1930s
Westland WE-01 short-range tilt-rotor conceptWestland WE-01 short-range, tilt-rotor concept. July 1968. Date: 1968
Sailing without sails by G. H. DavisSailing without sails: wind action on rotating cylinder masts. Partly driven and partly drawn forward by the action of wind on rapidly revolving cylinders
Westland WE-02 large tilt-rotor conceptWestland WE-02 large, tilt-rotor concept seating 80 passengers. July 1968. Date: 1968
Kaman early rotor test rig circa 1945-46Kaman early rotor test rig. circa 1945-46. Date: 1945
Cierva W11 Air Horse testing gearbox and transmission to rotor head. From left: Tommy Nisbett; Dave Smith, chief inspector; Joe Unsworth, flight engineer; Ken Watson
Flettners Rotor Ship 3Anton Flettners rotor-driven steamship Baden-Baden en route to New York, proving her viability if not her superior efficiency : she will sink in a storm in 1931