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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

 
Tim O'Connor
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