[Photo: Wright's first successful flying machine.]
During the winter of 1901-1902 Wilbur and Orville built a wind tunnel and conducted experiments to determine the best wing shape for an airplane. This enabled them to build a glider with sufficient lift, and concentrate on the problem of control. Toward the end of the 1902 flying season, their third glider became the first fully controllable aircraft, with roll, pitch, and yaw controls.
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