Boeing Model 64

The Boeing Model 64 was an American single-engine biplane training aircraft that Boeing built at its own expense in the 1920s and submitted to the US Army and Navy as a primary and gunnery trainer, but which failed to win any orders. Its fuselage and tail were welded steel tube, with wooden wing spars and ribs, and its wings reverted to an earlier two-bay design because of aerodynamic problems with the Model 21 or NB. For gunnery training a removable rear cockpit structure carried a gun ring with a flexible machine gun, and a fixed synchronized gun could fire through the propeller. It first flew in February 1926 and, after new thicker NACA Munk M-12 wings needing only one set of struts, flew again on 31 August 1926. The aircraft was sold to Pacific Air Transport, later fitted with a Wright J-5 engine and resold to a private owner.