Engineering Division TP-1

The prototype TP-1 was built as the XTP-1 and tested at McCook Field in 1923. A biplane, the upper wing had a smaller span and narrower chord than the lower wing. ==Operational history==

On October 10, 1928, Bill Streett and Albert William Stevens achieved an unofficial altitude record in the XCO-5 for aircraft carrying more than one person: ; less than short of the official single-person altitude record. At that height they measured a temperature of , cold enough to freeze the aircraft controls. With frozen controls, Streett was unable to reduce altitude or to turn off the engine until some 20 minutes later when it ran out of fuel, after which he piloted the fragile experimental biplane down in a gentle glide and made a deadstick landing. ==Variants==

;TP-1 :Two-seat pursuit fighter prototype, one built. ;XCO-5 :Observation variant of the TP-1, one built. ==Operators==

; • United States Army Air Corps ==Specifications==