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[/url]When you first sit in the cockpit
[/url]of an electric-powered airplane, you see nothing out of the ordinary.
However, touch the Start button and it strikes you immediately: an eerie silence. There is no roar, no engine vibration, just the hum of electricity and the soft whoosh of the propeller. You can converse easily with the person in the next seat, without headphones. The silence is a boon to both those in the cockpit and those on the ground below.
You rev the motor not with a throttle but a rheostat, and its high torque, available over a magnificently wide band of motor speeds, is conveyed to the propeller directly, with no power-sapping transmission. At 20 kilograms (45 pounds), the motor can be held in two hands, and it measures only 10 centimeters deep and 30 cm in diameter. An equivalent internal-combustion engine weighs about seven times as much and occupies some 120 by 90 by 90 cm. In part because of the motor’s wonderful efficiency—it turns 95 percent of its electrical energy directly into work—an hour’s flight in this electric plane consumes just US $3 worth of electricity, versus $40 worth of gasoline in a single-engine airplane. With one moving part in the electric motor, e-planes also cost less to maintain and, in the two-seater category, less to buy in the first place.
It’s the cost advantage, even more than the silent operation, that is most striking to a professional pilot. Flying is an expensive business. And, as technologists have shown time and again, if you bring down the cost of a product dramatically, you effectively create an entirely new product. Look no further than the $300 supercomputer in your pocket.
At my company, Bye Aerospace, in Englewood, Colo., we have designed and built a two-seat aircraft called the Sun Flyer that runs on electricity alone. We expect to fly the plane, with the specs described above, later this year. We designed the aircraft for the niche application of pilot training, where the inability to carry a heavy payload or fly for more than 3 hours straight is not a problem and where cost is a major factor....."
Great! Except that $3 of electricity in the US would be about $15 here (no joke, in the sad-ass mendicant state I dwell it is literally 5x the price per kWh of some US states). But as batteries improve these aircraft will look more promising, range and recharge time would be a worry at this point.