2017 Green Speed Cup – Airplanes More Frugal Than Priuses

Dean Sigler Electric Powerplants, GFC, Hybrid Aircraft, Sustainable Aviation Leave a Comment

The Green Speed Cup, held every year except for 2016 since 2011, is measure of an airplane’s efficiency, using a formula from the competition’s web site.  “The scoring will be very simple. The aircraft that flew with the best ratio of fuel-consumption per distance and speed will win the competition. The scoring of each competitor will be related to the winner. The winner gets 1000 points for one day.” According to Robert Adam, one of the organizers of the Cup, “We had a fantastic Green Speed Cup (and rightfully but reasonably prods your editor for not covering the results sooner.)  Luka Znidarsic from LZ Design won with his “front electric sustainer” Ventus glider. He had to close the gap between battery range and the given task range, but he managed with great success.  In our overall statistics of the last 6 cups, he put the e-Genius quite far behind him.” Winning against e-Genius is a formidable accomplishment, since that and Pipistrel’s …

Green Speed Cup Final: a Mix of Well-Flown Aircraft

Dean Sigler Electric Powerplants, GFC, Sustainable Aviation Leave a Comment

Day three of the Green Speed Cup in Strausberg, Germany brought few surprises other than how fuel efficient all of the aircraft turned out to be, especially considering they are all powered by gasoline engines.  Normally, this would demonstrate that even a light machine uses large amounts of fuel, but this contest demonstrated the benefits of good design and careful piloting. The Akaflieg Darmstadt D39 flown by Holger Massow came in first, winning the last two days outright.  Second went to Hans-Peter Ortwein flying a Stemme SV-10T, and third, perhaps surprisingly, to the only two-stroke powered machine, a Technoflug Piccolo, a fixed-gear, high-wing motorglider with an engine sticking up behind the wing.  The Piccolo was flown by Werner Scholz. Two Valentin Taifuns came in fourth and fifth, and a Stemme S6 took sixth place.  Two Scheibe SF-25s, a B and C model, took seventh and eighth places respectively.  A Fournier RF-5 captured ninth place and another SF-25-C rounded out the …