Helicopters and autogyros.
A rotorcraft is a heavier-than-air flying machine that uses lift generated by wings that revolve around a mast called rotor blades. Several rotor blades mounted to a single mast is referred to as a rotor. Rotorcraft may also include the use of static lifting surfaces, but the primary distinguishing feature being lift provided by one or more rotors. Rotorcraft include helicopters, autogyros, gyrodynes and tiltrotors.
The new, controversial, and expensive V-22 Osprey is a tiltrotor.
From Aero Digest, April, 1935:
Pitcairn Autogiro Company, Willow Grove, Pennsylvania
• President: Harold F. Pitcairn. Vice- president: James G. Ray. Chief Engineer Agnew E. Larsen.
TW0-place open direct control autogiro.
Wright Whirlwind R-975E engine, 420 horsepower at 2150 revolutions per minute. Diameter of rotor 46 feet 2 inches. Length overall 21 feet 10 inches. Height overall 11 [...]
A Wilford Gyroplane looks like an Autogiro but differs in that its rotor blades are controllable from the cockpit, and rigid save for a feathering motion. The idea behind this craft was a scheme for feathering the pitch of the blades rotating round the hub instead of the blade flapping system which La Cierva [...]
From Aero Digest, April, 1935:
Kellett Autogiro Corporation, Philadelphia, Pennsylvania
• President and Sales Manager: W. Wallace Kellett. Vice-president: C. T. Ludington. General Manager: R. G. Kellett. Chief Engineer: R. H. Prewitt.
Two-place wingless direct control autogiro. Jacobs L-4 engine, 225 horsepower. Rotor diameter 40 feet. Length overall (blades folded) 20 feet 6.5 inches.
Height overall (blades folded) 10 [...]
