light airplane. Successful flights took place in February and March 2008. The European Commission has financed many low TRL projects for innovative electric or hybrid propulsion aircraft. The ENFICA-FC is a project of the European Commission, to study and demonstrate an all-electric aircraft with fuel-cells as the main or auxiliary power system. During the three-year project, a fuel-cell based power system was designed and first flown in a Rapid 200FC ultralight aircraft on 20 May 2010. The first NASA Green Flight Challenge took place in 2011 and was won by a Pipistrel Taurus G4 on 3 October 2011. In 2013 Chip Yates demonstrated that the world's fastest electric airplane, a Long ESA, a modified Rutan Long-EZ, could outperform a gasoline-powered Cessna and other aircraft in a series of trials verified by the Fédération Aéronautique Internationale. The Long ESA was found to be less expensive, have a higher maximum speed, and higher rate of climb, partly due to the ability of the aircraft to maintain performance at altitude as low air density does not impair engine performance. In 2017, Siemens used a modified Extra EA-300 acrobatic airplane, the 330LE, to set two new records: on March 23 at the Dinslaken Schwarze Heide airfield in Germany, the aircraft reached a top speed of around over and the next day, it became the first glider towing electric aircraft. NASA developed the X-57 Maxwell to demonstrate technology to reduce fuel use, emissions, and noise. Modified from a Tecnam P2006T, the X-57 will have 14 electric motors driving propellers mounted on the wing leading edges. In July 2017, Scaled Composites is modifying a first P2006T by replacing the piston engines with electric motors, to fly early in 2018, then will move the motors to the wingtips to increase propulsive efficiency and finally will install the high aspect ratio wing with 12 smaller props. US/UK startup ZeroAvia develops zero-emissions fuel-cell propulsion systems for small aircraft, and tests its HyFlyer in Orkney supported by £2.7 million from the UK government. Solar aircraft On April 29, 1979, the Mauro Solar Riser became the first person-carrying, solar-powered aircraft to fly, with photovoltaic cells delivering at 30 volts and charging a small battery, which powered the motor. Following a 1.5-hour charge, the battery could power the aircraft for 3 to 5 minutes to reach a gliding altitude. It followed a successful model test in 1974, as solar cells were developed,