Electric aircraft have hit the news, with Cessna and Sikorsky to fly demonstrators soon, but scaling up the technology to produce a commercial aircraft with low or no emissions remains an enormous, if tantalizing, challenge. As manufacturers of light aircraft and helicopters, Cessna and Sikorsky can tap into the rapidly developing electric vehicle market for motors, controllers and batteries. Powering aircraft many times larger than a Cessna 172 will require much higher power densities, ...

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