P-26A at the NACA facility in 1933. Purpose was to check different flap designs so landing speed could be reduced. NACA came up with a design that Boeing said would not work. An airframe was modified per NACA specs and aircraft subsequently crashed.
Boeing engineering performing XP-936 wing structure loading test in early 1932.
U.S. Army Air Corps P-26A undergoing winter ski conversion.
Boeing Model 241 initial fuselage construction