Full Scale Investigation of the Drag of a Wing Radiator Page: 2 of 11
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NASA Telical Libr -
3 1176 01425 6433
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS.
TECHNICAL NOTE NO. 318.
FULL SCALE INVESTIGATION OF THE DRAG OF A WING RADIATOR.
By Fred E. Weick.
Summary
Tests were made on the left lower wing of the 1927 Williams
racer in the Twenty Foot Propeller Research Tunnel, in order to
determine the effect of the wing radiator on the airfoil char-
acteristics. It was found that the radiator doubled the minimum
drag of the portion of the wing which it covered, and also re-
duced the lift somewhat.
Tests
At the request of the Bureau of Aeronautics, Navy Depart-
ment, an investigation was made of the effect of a certain type
of wing radiator on the high-speed aerodynamic characteristics
of a wing. The left lower wing of the Williams racer was furn-
ished by the Bureau for this purpose, and the tests on it were
made in the 20-foot air stream of the Propeller Research Tunnel
(Reference 1).
The rounded tip of the wing was cut off so that the entire
surface tested, excepting a 2-inch strip along each end, was
covered by the radiator as shown in Figure 1. This left the
span 75.62 inches, and with the chord of 44 inches, gave an as-
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Weick, Fred E. Full Scale Investigation of the Drag of a Wing Radiator, report, September 1929; (https://digital.library.unt.edu/ark:/67531/metadc54046/m1/2/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.