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Cambridge boffins and Boeing fly first hybrid airplane over British skies

Dave Bell

A small internal combustion engine, sized for the cruise regime, can be quite efficient, with a little on top to charge the battery. And the power boost from the electric motor for take-off and climb will be much quieter . With the relatively long cruise, it doesn't need a huge excess to recharge the battery. I doubt this plane has much spare weight, but adding solar panels would be possible.

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