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pressure movement. These experiments showed that a multi-surfaced, stepped arrangement with pronounced stagger, with the highest surface in front, [[strikethrough]] were [[/strikethrough]] was more efficient. [[strikethrough]] and gave the best results. [[/strikethrough]] Exhaustive experiments proved that such an arrangement of surfaces stalled less easily and automatically recovered a normal glide [[strikethrough]] inherently [[/strikthrough]] angle. As a result of these lengthy experiments Sellers became a recognized authority on flight efficiency and natural stability of aircraft.

In 1907 he made his second man-carrying glider, a quadraplane (having four wings) [[strikethrough]] which he called a Quadraplane [[/strikethrough]] each of 18 feet span and 3 feet chord (wing width) spaced at 2 ft. 2 in. apart with which he made scores of very successful glides, both manually launched and in towed flight. Sellers continued his gliding experiments [[strikethrough]] both [[/strikethrough]] in Kentucky during the summer, then in Georgia through the winter months, until mid 1908 when he added a three-wheel landing gear and installed a small 4 hp - 2 cylinder opposed French built Dutheil-Chalmers engine driving a 54-inch-diameter pusher propeller. [[strikethrough]] The plane had 18 ft. span and each of the four wings had a 3 ft. chord, spaced 2 ft. 2 in. apart, giving a total of 200 sq. ft. of wing area. [[/strikthrough]] The complete weight of the airplane was 110 lb. With this machine he made his first successful straightaway hop on December 28, 1908. Fifteen more hops followed that day and he soon learned he could fly but not climb nor make a turn. After drilling auxiliary exhaust port holes in the cylinders and making other engine changes he was able to obtain 5 hp, which was helpful, but his plane was still underpowered.

In May 1910 Sellers installed an 8-10 hp, Chicago-built Bates, 2 cylinder engine driving a 66-inch diameter pusher propeller. [[strikethrough]] and using [[/strikethrough]] With this engine he could climb and turn successfully. [[strikethrough]] With this machine [[/strikthrough]] He reportedly made over 200 flights, experimenting with various control and stability arrangements. His plane was [[strikethrough]] indeed [[/strikthrough]] most unusual in that it probably was the first plane in the world that carried over twice its own weight on such low power. It would also fly at 20 mph in still air without losing altitude. These tests continued into 1911 when suddenly his loyal assistant and close friend was killed when he was struck by the propeller.

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