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An exploratory investigation of the effect of a plastic coating on the profile drag of a practical-metal-construction sailplane airfoil (1979)

Foster, J. M. ; Somers, D. M.

In: CASI

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Publication Date: 2019-06-27

Description: The Langley low-turbulence pressure tunnel to determine the effect of a plastic coating on the profile drag of a practical-metal-construction sailplane airfoil was investigated. The model was tested with three surface configurations: (1) filled, painted, and sanded smooth; (2) rough bare metal; and (3) plastic-coated. The results are compared with data for the design airfoil (Wortmann FX 67-K-170/17) from another low-turbulence wind tunnel. The investigation was conducted at Reynolds numbers based on airfoil chord of 1.1 x 10 to the 6th power, 2.2 x 10 to the 6th power, and 3.3 x 10 to the 6th power at a Mach number of 0.10.

Keywords: AERODYNAMICS

Type: NASA-TM-80092 , L-11623

Format: application/pdf

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