What goes for an airport or a bay can be scaled up to an ocean, or the air above it, and down to the flow off an aircraft's wingtip, or a ship's hull.

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Deuce is a stern steerer, so called because the vehicle is steered via a single pivoting skate fixed to the back end of a long central spine analogous to a boat's hull.

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That won't be a factor with the 787's carbon-fiber hull, which can't rust, so Boeing has designed a system with 20% humidity.

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