Aircraft performance by W. Austyn Mair

By W. Austyn Mair

This ebook describes the foundations and equations required for comparing the functionality of an plane. After introductory chapters at the surroundings, easy flight idea, and drag, the booklet is going directly to give some thought to intimately the estimation of mountaineering functionality, the suitable features of energy vegetation, takeoff and touchdown functionality, diversity, and turning functionality.

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Sample text

Cierva was the first to use the flap hinge in a successful rotary-wing aircraft. 4 autogyro was built and flown. 8-m diameter rotor, 110-hp Le Rhone engine). Control was by conventional airplane aerodynamic surfaces. 6A autogyro with flapping rotor blades was built (11-m diameter four-bladed rotor, 100-hp Le Rhone rotary engine). An Avro 504K aircraft fuselage and ailerons on outrigger spars were used. The demonstration of this autogyro in 1925 at the Royal Aircraft Establishment was the stimulus for the early analysis of the rotary wing in England by Glauert and Lock.

The rotor performs much like a wing and has a fairly good lift-to-drag ratio. Although rotor performance is not as good as that of a fixed wing, the rotor is capable of providing lift and control at much lower speeds. Hence the autogyro is capable of flight speeds much slower than fixed-wing aircraft. Without power to the rotor, it is not capable of actual hover or vertical climb. Because autogyro performance is not that much better than the performance of an airplane with a low wing loading, usually the requirement of actual VTOL capability is necessary to justify a rotor on an aircraft.

He then became interested in designing an aircraft with a low takeoff and landing speed that would not stall if the pilot dropped the speed excessively. 18. Autogyros. Cierva image courtesy American Helicopter Society; Pitcairn image from NACA. determined from wind-tunnel tests of model rotors that, with no power to the shaft but with a rearward tilt of the rotor, good lift-to-drag ratio could be obtained even at low speed. The best results were at low, positive collective pitch of the rotor. ” He had a model with blades of flexible palm wood that flew properly.

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