A NACA duct, also sometimes called a NACA scoop or NACA inlet, is a common form of low-drag air inlet design, originally developed by the U.S. National Advisory Committee for Aeronautics (NACA), the precursor to NASA, in 1945. == Design == Prior submerged inlet experiments showed poor pressure recovery due to the slow-moving boundary layer entering the inlet.
A NACA duct, also sometimes called a NACA scoop or NACA inlet, is a common form of low-drag air inlet design, originally developed by the U.S. National Advisory Committee for Aeronautics (NACA), the precursor to NASA, in 1945. == Design == Prior submerged inlet experiments showed poor pressure recovery due to the slow-moving boundary layer entering the inlet.
Source: Wikipedia "NACA duct" · CC BY-SA 4.0
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