In June 2001, Pipistrel begun the development of the Taurus as one of the first self-launched gliders in the microlight category. The design used the wings of the Pipistrel Sinus with a new two-seat side-by-side fuselage. To enable the Taurus to self-launch, a pop-out propeller is mounted on the rear fuselage driven by a Rotax 503 piston engine. In 2007 the company developed the Taurus Electro with the piston engine replaced by a permanent magnet synchronous three-phase brushless motor. By 2011, Pipistrel had delivered 100 aircraft of the Taurus family. In 2010, the Taurus Electro was awarded the gold medal at the Slovenian Biennale of Design (Bienale industrijskega oblikovanja) BIO 22 "due to its supreme beauty and advanced technologies (...) in a design where form truly follows function in the most aesthetically pleasing way". In AERO Friedrichshafen 2011, the Taurus Electro received the Lindbergh Electric Aircraft Prize for "best electric aircraft". The prize recognized the Electro’s “plug and play” electric power system, enhanced by solar panels on the aircraft trailer that allow the system to recharge using clean energy. In September 2011, the Taurus G4 won the CAFE Foundation's Green Flight Challenge, covering 403.5 passenger miles per gallon gasoline equivalent with two people on board, and receiving the $1.35 million prize donated by NASA. For details of the six variants, click here. The specifications below are for the Taurus M variant. Taurus G4