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I believe the U. S. Army Air Corps's Curtiss O-52 Owl is a fairly well-known type.
Still, it came to me as a surprise to discover the alternate armed variant shown in the attached plan. Was this ever tested on a real aircraft, or did it remain a paper project?
Still, it came to me as a surprise to discover the alternate armed variant shown in the attached plan. Was this ever tested on a real aircraft, or did it remain a paper project?