The Pipistrel Sinus is a two-seat, single-engine ultralight motor glider, developed and manufactured by Pipistrel in Slovenia and Italy. Its design has served as the base for future Pipistrel developments such as the Virus and Alpha Trainer. Introduced in 1995, the Sinus has been produced in a number of variants with different engines and undercarriage configurations. It has good STOL characteristics and it can be equipped with a full airframe emergency recovery parachute system.