Sauer S 1900 ULThe Sauer S 1900 UL is a 4 stroke aircraft engine for homebuilt and ultralight aircraft.Design and developmentThe engine is based on the Volkswagen air-cooled engine. It is extensively modified for aircraft use and all the parts are custom made. The engine is derived from the certified engines produced by the same manufacturer and used in several motorgliders and light aircraft.ApplicationsSkyranger SW