Alpaero claims lower vibration, easy maintenance and fuel consumption of only 4 liters per hour to feed its 28 horses.
This solution makes it easier to use, well in agreement with the schedule of conditions of this single-seater. The Alpaero Exel was originally equipped with a two-stroke, two-cylinder JPX-320D engine, but recently changed from fiberglass construction to carbon fiber to make allowances for a heavier, but more efficient, Briggs & Stratton four-stroke, V-twin unit. To further save costs, the aircraft can be carried atop an automobile. Winning a €10,000 ($12,718 at press time) prize in this year’s Berblinger Prize competition, part of the Friedrichshafen Aero Expo, Ruhmer’s electrified Swift was calculated by judges to fly on a diesel fuel equivalent between zero and 0.38 liters per 100 kg (619 mpg). In a 2009 email, Ruhmer noted, “The flying characteristics are the same as for the free-flying version.” He added that aerodynamically, the machine reacts just as the foot-launcher does, and for slow speed and weak thermal soaring, the Swift “is a very good machine.” He can make several takeoffs in one afternoon, soar about the local landscape, and relaunch repeatedly on one battery charge.
COLLAPSIBLE HANG GLIDER SERIES
The unit uses battery packs arranged with 16 batteries in series and nine in parallel configuration for a total of 144 cells (A123 Systems LiFePO4), weighing 12.5 kg (27.5 pounds) and providing 58 volts and 20.7 amp hours. An HP-10 motor, controller and battery packs fit into a tight area, maintaining the Swift’s aerodynamics.
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