01/31/2011. Remarks by Loet Kuipers: "The Antares DLR-H2 research aircraft, developed by the DLR (Deutsches Zentrum für Luft- und Raumfahrt, German Aerospace Center) at Cologne, Germany, was produced by Lange Aviation of Zweibrücken, and is based on the Lange Antares 20E self-launching motorglider.
The DLR-H2 has completed its first test flight on July 9, 2009, making it the world's first zero-emissions aircraft to successfully fly on hydrogen fuel cell power alone. And because hydrogen fuel cells only react with oxygen in ambient air, the lone byproduct is water, which has no ill effect on the environment.
When flying in a straight line, the DLR-H2 is capable of running at about 52% efficiency, drawing over 13 hp of power in the process (it's capable of delivering up to 33.5 hp). It has a range of roughly 450 mls (724 km), flying at speeds of 105 mph (169 kmh)."