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The UK Tests The First Electric Plane That Can Charge Its Batteries During Flight 

A new hybrid-electric aircraft, the first ever to be able to recharge its batteries in flight, has just been tested in the UK, the University of Cambridge announced in a statement today. 

The plane uses a "parallel hybrid-electric propulsion system," where an electric motor works with a regular petrol motor to drive a propeller. It's just been trialled at a test site in Northamptonshire. 

 According to Cambridge engineers, the plane uses 30% less fuel than a similar model that only uses a petrol engine. More importantly, the new design can also recharge its batteries during flight - something that's never been achieved before. 

 "Although hybrid cars have been available for more than a decade, what's been holding back the development of hybrid or fully-electric aircraft until now is battery technology," project leader and Cambridge professor Paul Robertson said in a statement. "Until recently, they have been too heavy and didn't have enough energy capacity. But with the advent of improved lithium-polymer batteries, similar to what you'd find in a laptop computer, hybrid aircraft - albeit at a small scale - are now starting to become viable."