SW - Gerin Varivol V 6

In the 30's there were many experiments with variable-area wings provided, mostly in France, where aircraft designer Jacques Gerin constructed special experimental biplane with very narrow metal wings and additional flexible surfaces made from wood and canvas. The adds were located inside the fuselage during flight and moved by electrical engine during takeoff and landing to increase area of the wings. The wings flat could be increased this way from 6,3 m2 to 26 m2. Movable tips of the upper wing help with airplane control. In 1936 the aircraft was tested in the wind tunnel at Chalais-Meudon and then flew till the November of the same year. Then crashed, its pilot died and experiment was stopped though the wings were not a cause of the accident. Two years later, in 1938, Gerin used the similar concept for next aircraft, racing machine V-6E Varivol Racer.