Space History Photo: Wing Flow Method

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A NACA technician prepares to use a P-51D for transonic testing. (Image credit: NACA.)

In this historic 1946 photo from the U.S. space agency, a semispan airplane model and flow-direction vane mounted on wing of P-51D airplane for transonic tests by wing-flow method.

The National Advisory Committee on Aeronautics, (NACA) was a precursor to NASA. NACA was created by Congress in 1915.

Each weekday, SPACE.com looks back at the history of spaceflight through photos (archive).

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