American Aviation Historical Society

 
Stearman PT-13, s/n AC-36-2, c/n 75001 at Wright Field, Ohio while undergoing service testing in 1936. Note the Lycoming R-680-5 engine, McCauley steel blade propeller and spin strips on leading edges of both the upper and lower wings. (Photo credit: USAAC via National Museum of the USAF)

 

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