The mutual action of airplane body and power plant (1932)
NASA Technical Reports Server (NTRS) · leaf 36
il.A.C.A. Technical Memorandum No. 665 ?igs. 1,2,3,4 … 'lOOO 1200 /1600 2000 1400 1800 2200 Fig. 4 Efficiency against r.p.m. power coefficient Fig. 1 Full power curves of (series of Fig. 3) various aircraft engines
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.