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Drag and Cooling with Various Forms of Cowling for a "Whirlwind" Radial Air-Cooled Engine I (1930)
NASA Technical Reports Server (NTRS) · leaf 23
REPORT NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS … Figure 23.—Cowling No. 10NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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