American Leland Snow designed a low wing monoplane duster called the S1 early in his career. In August, 1953, the S1 flew for the first time, powered by a 190 hp Lycoming. Unusually for a US agplane, the pilot sat between the engine and the hopper, and, unlike later Snow models, the aircraft had wing struts. The aircraft was successful, enough for Snow to take it to Nicaragua for a season the following year. To give it more power, it was fitted with a Continental radial of 220 hp. Damaged by a thunderstorm in 1958, this aircraft was destroyed in a warehouse fire a few years later.