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Whitcomb winglets, seen sticking up on the tips of some airliner wings, recover energy from the wingtip vortex. Theoretically, one can recover some energy from a turbulent wake, but it is easier to prevent it. Those winglets would do just as much good as extra wing area, but are used to save space on the ground.
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There is no excuse for a land vehicle to weigh more than its average payload.
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