Its trial with the Fairchild engine was unsatisfactory, and on 10 January 1929 it was refitted by Wright Aeronautical with a 160 hp Wright J-6-5 engine.
It quickly became apparent that the aircraft was underpowered, so Curtiss replaced the engine with a 150 hp (112 kW) Hispano-Suiza, manufactured in the United States under license by Wright-Martin's Simplex division (later Wright Aeronautical).
In May 1923, Wright Aeronautical purchased the Lawrance Aero Engine Company, as the United States Navy was concerned that Lawrance couldn't produce enough engines for its needs.
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In 1917, the two major patent holders for airplanes, the Wright Company and the Curtiss Company, had effectively blocked the building of new airplanes, which were desperately needed as the United States was entering World War I.