National Advisory Committee for Aeronautics

(N.A.C.A.) It was the American organization which operated from 1917 until 1958 and compiled a huge library of studies conducted in aeronautics and aerodynamics. They developed the kinds of designs for low drag air ducts for jet engines. NACA ducts are used on cars to force air for engine breathing and cooling, for forcing air through the radiators, and for providing fresh air for the passenger compartment. Wing shapes are identified using a N.A.C.A. based naming system.