The world's first piloted aircraft capable of taking to the air using only power from fuel
cells has flown, producing zero carbon dioxide emissions during the landmark mission.
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Aviation, BASF Fuel Cells and Denmark's Serenergy - has a range of 750 kilometres (465
miles) and can fly for five hours at maximum flying speeds of approximately 170 kilometres per hour.
DLR says it has improved fuel cell performance capabilities and efficiency to such an
extent that the motor glider can take off using fuel cell power alone.
"This enables us to demonstrate the true potential of this technology," said DLR's Johann-Dietrich Wörner who concedes however that fuel cell use constitutes a more likely alternative to existing onboard energy systems than main propulsion alternatives.
The system uses hydrogen as its fuel which is converted into electrical energy in a direct, electrochemical reaction with oxygen in the ambient air, without any combustion occurring and producing only water.
To accommodate the fuel cell and the hydrogen supply, two additional external load carriers weighing 100 kgs were slung under the specially reinforced wings whose aeroelastic properties had to be reconfigured to safeguard flight stability.
The fuel cell system used to power the Antares delivers up to 25 kilowatts of electrical power although operates at an efficiency level of approximately 52 percent when the aircraft is flying in a straight line, which requires around ten kilowatts of power.
The total efficiency of the drive system from tank to powertrain, including the propeller, is around 44 percent, making it about twice as efficient as conventional propulsion technologies based on combustion processes.
Another innovation is the way its fuel cell is connected to the main electric motor that powers the aircraft. Developed jointly with Lange Aviation and the College of Advanced Technology in Berne/Biel, it is capable of taking in and controlling voltages from 188 to 400 V increasing efficiency, cost and, reliability.
The Antares DLR-H2 will be based at Lufthansa Technik in Hamburg where, over the next `three years, it will be acting as a flying test platform for the fuel cell test activities of DLR as part of its Fuel Cell Labs project.