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armbThe idea of kites as sails for big cargo ships has been around for a while (paper from 1996, updated in 1998), but SkySails have now actually sold one.
(KiteShip have had a real product for a while, but they are replacing spinnakers on conventional sailing boats.)
(KiteShip have had a real product for a while, but they are replacing spinnakers on conventional sailing boats.)