NACA explained its first work with airfoils in 1917 NACA Technical Report No. The first NACA Annual Report stated the need for "the evolution of more efficient wing sections of practical form, embodying suitable dimensions for an economical structure, with moderate travel of the center of pressure and still affording a large angle of attack combined with efficient action." When the National Advisory Committee on Aeronautics (NACA) was established in 1915, its members immediately recognized the need for better airfoils. Most American airplanes used either RAF sections or a shape designed by Frenchman Alexandre Gustave Eiffel (best known for designing the Eiffel Tower). Airfoils such as the RAF 6 were used on World War I airplanes. The British government had performed some work at the National Physical Laboratory (NPL) that led to a series of Royal Aircraft Factory (RAF-not to be confused with the Royal Air Force) airfoils. Before World War I, there had been little research to develop a standardized airfoil section for use on more than one aircraft. But during the early years of powered flight, airfoils for aircraft were essentially hand-built for each airplane. The Wright brothers had done some of the earliest research on the most effective curvature, or camber, of a wing, known as an airfoil. It was used extensively during World War II. The North American XP-51 Mustang was the first aircraft to incorporate a NACA laminar-flow airfoil.
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