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Description of the NACA Universal Test Engine and Some Test Results (1927)
NASA Technical Reports Server (NTRS) · leaf 7
REPORT NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS … Fig. 3—N. A. C. A. universal test engine—transverse cross sectionNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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