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Originally Posted by Xist
Wherever possible, it is always better to plan ahead, so that you do not need to brake.
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When you descend several thousand vertical feet of winding mountain road, though, some braking is highly recommended :-)
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I do not have any idea about an aircraft that could pulse and glide, braking regeneratively; it just seems the same as a car, you burn energy to accelerate, and then try to recover it with a loss.
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You could easily do it in a sailplane, given an afternoon with good thermals. Not really a good option for cross-country travel, though, as you spend a lot of time circling in the thermals.