[5] After trying unsuccessfully to keep the fairways in shape by grazing sheep on them, Worthington designed the gang mower with three moving wheels.[5] The first Worthington gang mower was three-wheeled, pulled by horses with their hooves covered in leather to prevent damage to the grass.The next year they began using engines made specially for them by the Harley Davidson Motor Company of Milwaukee, Wisconsin.[7] In the late 1930s, Worthington produced the Model C using a Chrysler six-cylinder engine and transmission and axles from the Dodge pick-up.[5] In 1930 the company won a contract to supply mowers to the Air Corps for mowing airfields based on technical superiority, despite not being the lowest bid.[5] Worthington made cabs on some of their 1946 Chief models, most likely used for airports, where they would pull aircraft as tugs and mow strips of grass with gang mowers along the runways.