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Lloyd Carlton Stearman, is an American engineer, pilot and entrepreneur born in October 26, 1808 in Wellsford, Kansas and passed away in April 3, 1975 in Northridge, California.
The Stearman Aircraft Company conceived and built the Model 70, a training two-seater biplane, without any money from the government. Only one Model 70,
In the same time, the Stearman Aircraft Company was affiliated with Boeing creating the Wichita division of the Boeing Aircraft Company.
The U.S. Army Air Corps being interested in the Model 75, it was modified into the Model X75 with a different landing gear and a 225 hp Wright R-760 and later with a 225 hp Lycoming R-680. The aircraft was flown before USAAC officials for the first time in late 1934 then in the spring of 1935. An order for 26 Model X75 powered by the Lycoming engine and designated PT-13 (Primary Trainer) was finally placed in 1935. Orders were placed too by Argentina, Philippines and later Brazil. In 1936, 80 PT-13A powered by the 220 hp Lycoming R-680-7 were ordered for the USAAC and 26 more in January 1937. Total production of the PT-13A for the USAAC is 92. 6 PT-13A were built and modified in 1941 for night flight training under de designation PT-13C. The PT-13A was followed by the PT-13B powered by the 220 hp Lycoming R-680-11. Total production of the PT-13B is 225.
The PT-13D introduced the choice of the 225 hp Continental R-670-5 to power the aircraft and led to the PT-17 designation. Total production of the PT-13D attained 1 018 aircraft and 2 965 for the PT-17. 18 PT-17 were modified for blind flying and designated PT-17A. 3 PT-17 were modified for crop dusting and then designated PT-17B.
The Boeing-Stearman is a biplane of mixed construction with fabric cowered wooden wings and welded steel tubes fuselage. The fixed landing gear used faired hydraulic dampers in front and a tail wheel.
The U.S. Navy ordered 250 Model 75 powered by a 220 hp Continental R-670-4 under the designation N2S-1. An order for 125 N2S-2 with a 215 hp Lycoming R-680-8 followed. The N2S-3 returned to the Continental R-670-4 and 1 875 aircraft of this type were built. 99 PT-17 destined to equip the USAAC were diverted to the Navy that were identical to the 177 ordered by the Navy
In 1941 and for the first time, the federal government ordered the same type of aircraft for the Navy and the USAAC with the P-13D and the N2S-5 for the Navy, total production of which attained 1768 aircraft.
Interestingly, the Model 75 ordered for foreign Air and Navy Forces and powered by a 320 hp Pratt & Whitney R-985-T1B was designated Model 76.
