The development of the Sinus began in November 1994 in close collaboration with the Slovenian firm Albastar Ltd.[4] The wing and fuselage were designed by the Italian aerodynamicist Franco Orlando.

In April 1995, the Sinus was unveiled at AERO Friedrichshafen, the main European general aviation trade show.

[5] The Sinus has served as the base for the design of future Pipistrel models such as the Virus, which shares the same fuselage and tail, but sports a shorter wing.

The outer section of the wing can be replaced by a shorter part consisting of the winglet of the Virus model, converting the aircraft from motor glider to sport cruiser in minutes.

In 2001, Philippe Zen and Thomas Knowles flew a Sinus at the World Air Games in Spain and won first place in the two-seat category.