In 1919, Loughead Aircraft entered the small aircraft market with the single-seat S-1 Sport Biplane. Intended to be "the poor man's airplane", it featured an innovative molded plywood monocoque fuselage for which the Lougheads, Northrop and Tony Stadlman received a patent. Its foldable wings allowed storage in a garage, and the lower wings could be rotated to act as ailerons and airbrakes.[1] Because no suitable engines were available, the company designed and built a 25-horsepower water-cooled engine for the S-1.[2]