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From BBC News: [check put the fuel cost comparisons on short...

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    From BBC News: [check put the fuel cost comparisons on short hauls]

    Why the age of electric flight is finally upon us

    Aerospace firms are joining forces to tackle their industry's growing contribution to greenhouse gas emissions, with electric engines seen as one solution. But will this be enough to offset the growing demand for air travel?

    This week's Paris Airshow saw the launch of the world's first commercial all-electric passenger aircraft - albeit in prototype form.

    Israeli firm Eviation says the craft - called Alice - will carry nine passengers for up to 650 miles (1,040km) at 10,000ft (3,000m) at 276mph (440km/h). It is expected to enter service in 2022.

    Alice is an unconventional-looking craft: powered by three rear-facing pusher-propellers, one in the tail and two counter-rotating props at the wingtips to counter the effects of drag. It also has a flat lower fuselage to aid lift.

    "This plane looks like this not because we wanted to build a cool plane, but because it is electric," says Eviation's chief executive Omer Bar-Yohay.

    "You build a craft around your propulsion system. Electric means we can have lightweight motors; it allows us to open up the design space."

    Eviation has already received its first orders. US regional airline Cape Air, which operates a fleet of 90 aircraft, has agreed to buy a "double-digit" number of the aircraft.

    The firm is using Siemens and magniX to provide the electric motors, and magniX chief executive Roei Ganzarski says that with two billion air tickets sold each year for flights of under 500 miles, the business potential for small electric passenger aircraft is clear.

    Crucially, electricity is much cheaper than conventional fuel.

    A small aircraft, like a turbo-prop Cessna Caravan, will use $400 on conventional fuel for a 100-mile flight, says Mr Ganzarski. But with electricity "it'll be between $8-$12, which means much lower costs per flight-hour".

    "We're not an environmentalist company, the reason we're doing this is because it makes business sense."

    MagniX is now working with seaplane operator, Vancouver-based Harbour Air, to start converting their existing fleet to electric.

    The future also looks reasonably bright when it comes to medium-range flight - a range of up to about 1,500km.

    Unlike Alice, aircraft targeting this range would use a mix of conventional and electric power, enabling them to cut CO2 emissions significantly by switching on the electrical component of their propulsion at the key points in a flight - take-off and landing.

    Several demonstration projects are now nearing fruition.

    For example, Rolls-Royce, Airbus and Siemens are working on the E-Fan X programme, which will have a two megawatt (2MW) electric motor mounted on a BAE 146 jet. It is set to fly in 2021.

    "There are huge amounts of energy involved here, the engineering is absolutely leading-edge - and our investment in electrification is ramping up rapidly," says Rolls-Royce's chief technology officer Paul Stein.

    United Technologies, which includes engine-maker Pratt & Whitney in its portfolio, is working on its Project 804, a hybrid electric demonstrator designed to test a 1MW motor and the sub-systems and components required.

    The firm says it should provide fuel savings of at least 30%. It should fly in 2022 and is forecast to be ready for regional airliners by the mid-2020s.

    Zunum Aero, backed by Boeing, is using a engine turbine from France's Safran to power an electric motor for a hybrid craft. And low-cost airline EasyJet is working with Wright Electric, saying it will start using electric aircraft in its regular services by 2027. This is likely to be on short-haul flights, such as London to Amsterdam - Europe's second busiest route.

    "Electric flying is becoming a reality and we can now foresee a future that is not exclusively dependent on jet fuel," says EasyJet chief executive Johan Lundgren.

    It's a statement underscored by a report from investment bank UBS which predicts the aviation sector will quickly switch to hybrid and electric aircraft for regional travel, with an eventual demand for 550 hybrid airliners each year between 2028 and 2040.
 
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