Electric aviation awaits a battery breakthrough
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Beta Technologies Alia on the way to Stavanger in Norway
An aviation rarity touched down in the Norway's second city of Bergen earlier this month. Alia had flown 100 miles (160km) in 55 minutes on battery power alone. Built by US aerospace company Beta Technologies, the electric plane is designed for cargo operations - carrying up to 560kg (half a tonne) loads. The flight had simulated a planned cargo route between the coastal cities of Stavanger and Bergen, and for the next few months test-flights will be carried out, as part of the country's move towards establishing low-emission aviation. At the helm was pilot Jeremy Degagne, "If you do the drive, it's four and a half hours. And we did the flight in 52 minutes." "It is an important milestone for Norway as an international test arena," says Karianne Helland Strand, a director at Norwegian airport operator, Avinor. The test-flights in Norway follow a whirlwind European tour, which kicked off in Ireland, and saw Alia debut at the Farnborough and Paris Air Shows, as well as making stops in Germany and Denmark.
Beta Technologies Alia has a range of 400km
Alia can fly up to 400km (250 miles) on a single charge, and refuel in less than 40 minutes by plugging-in, just like an electric car. The same fixed-wing model can be configured for medical transport or passenger travel with up to five seats, and this June it undertook the first electric demonstration flight carrying passengers into New York's JFK airport. Beta, which counts Amazon as an investor and UPS as a customer, hopes to get US certification for its plane this year. "I'm convinced that the next major breakthrough in aerospace will come on the back of electric propulsion," says Beta's chief revenue officer Shawn Hall, who's a former fighter pilot. "We're now able to significantly lower the operating cost and it's environmentally beneficial from a carbon perspective."
Alia is one of the most advanced projects, among dozens of firms exploring electric propulsion in aviation. It would be one way of reducing the aviation industry's carbon footprint - which currently accounts for 3% of the world's greenhouse gas emissions. However, the Pipistrel Velis Electro remains the only electric plane to receive full certification from European authorities, despite clearing that hurdle five years ago. With a range of 185km and 50 minutes of flight time, the Slovenian-built Pipistrel is limited to training and not for shuttling passengers from A to B. But successes like that have been overshadowed by a string of failures in electric aviation. Even aviation giant Airbus has backed away from the market. In January it announced that development of its CityAirbus electric aircraft would be put on hold.
Airbus Development of the CityAirbus is on hold
Range remains the major limitation to electric flight. Even the best lithium ion batteries are bulky and heavy, with much lower energy density than jet fuel. They have "not improved significantly" over the past two decades, reckons Guy Gratton, an aviation expert and professor at Cranfield University. For electric flight to take-off, a "revolution" in battery chemistry is needed, he says. Given those limitations, some are looking at alternative technology. Just as hybrid cars were a stepping stone towards electric vehicles; plane-makers are now also experimenting with hybrid technology. Among the aviation start-ups trying to get electric passenger planes off the ground, is Heart Aerospace. It recently shifted its entire operations from Sweden to the US, which its management said would help it focus "resources" and be closer to clients, including the airlines Mesa and United. The firm has developed a 30-seater, prototype plane, the X1, which the BBC saw before it was shipped to the United States. If all goes to plan during upcoming test-flights, it will become the largest battery-powered plane to fly. "It has about two tons of batteries in it," explained chief technology officer Benjamin Stabler.
Heart Aerospace Heart plans a hybrid plane that can switch between batteries and jet fuel
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