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Kite boats
(i.imgur.com)
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Don't be mean. I promise to do my best to judge that fairly.
The next idea someone will have will be the ability to angle the 'kite'. This enables you to direct thrust when the wind isn't blowing the perfect direction. This might require something new and rigid, like a 'mast'.
They don't really want to sacrifice deck space though. It'd be more efficient that way, but would mean they can carry much less cargo