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From zero to forty without moving a muscle

From zero to forty without moving a muscle

作者:常崭  时间:2019-03-07 13:08:02  人气:

By Duncan Graham-Rowe SCOOTERS may not have engines, but that doesn’t mean they can’t burn rubber. The next time you see someone on the Teletubbies’ preferred mode of transport, don’t be surprised if they tear off from the traffic lights at 40 kilometres per hour without so much as a push. The key to this effortless acceleration is an ingenious flywheel in the scooter’s foot stand that stores energy as the rider travels downhill. A new vehicle featuring this device, the Flytech scooter, was on show at the New Designers exhibition in London last week. Invented by Daniel Mohacek of Loughborough University in Leicestershire, the Flytech makes use of the energy that is normally wasted when the brakes are applied. What makes it so effective is the flywheel’s built-in gear system, which has no moving parts, says Lee Bazalgette, who also worked on Flytech’s design along with James Kynvin and Mark Robertson. The flywheel is shaped like a flying saucer and is partially filled with oil. It takes relatively little energy to start it spinning, because the oil pools in the centre when it is stationary. But as it picks up speed, the oil is forced up the sides of the flywheel towards the outer edge, increasing the flywheel’s moment of inertia. The result is that the faster the scooter’s flywheel spins, the more energy it can store. “If it’s fully wound up it will take you tens of metres without pushing,