October 5. Influence The Flyer series of aircraft were the first to achieve controlled heavier-than-air flight, but some of the mechanical techniques the Wrights used to accomplish this were not influential for the development of aviation as a whole, although their theoretical achievements were. The Flyer design depended on wing-warping controlled by a hip cradle under the pilot, and a foreplane or "canard" for pitch control, features which would not scale and produced a hard-to-control aircraft. The Wrights' pioneering use of "roll control" by twisting the wings to change wingtip angle in relation to the airstream led to the more practical use of ailerons by their imitators, such as Glenn Curtiss and Henri Farman. The Wrights' original concept of simultaneous coordinated roll and yaw control (rear rudder deflection), which they discovered in 1902, perfected in 1903–1905, and patented in 1906, represents the solution to controlled flight and is used today on virtually every fixed-wing aircraft. The Wright patent included the use of hinged rather than warped surfaces for the forward elevator and rear rudder. Other features that made the Flyer a success were highly efficient wings and propellers, which resulted from the Wrights' exacting wind tunnel tests and made the most of the marginal power delivered by their early homebuilt engines; slow flying speeds (and hence survivable accidents); and an incremental test/development approach. The future of aircraft design lay with rigid wings, ailerons and rear control surfaces. A British patent of 1868 for aileron technology had apparently been completely forgotten by the time the 20th century dawned. After a single statement to the press in January 1904 and a failed public demonstration in May, the Wright Brothers did not publicize their efforts, and other aviators who were working on the problem of flight (notably Alberto Santos-Dumont) were thought by the press to have preceded them by many years. After their successful demonstration flight in France on August 8, 1908, they were accepted as pioneers and received extensive media coverage. In 1909, the Wright Military Flyer became the world's first military aircraft after successful tests on June 3, 1909. This airplane was purchased by the army but was never used in combat; it was, however, used to train some pilots. It was donated to the Smithsonian Institute in 1911 and is on display in the Early Flight exhibit at the National Air and Space Museum. A modified version, the Wright Model