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Boats can’t reach high speeds because of the friction between the hull and the water. In 1877 Sir John Isaac Thornycroft, a brilliant British boat designer suggested that trapping air under a boat might reduce the friction problem. He tested his idea with a scale model of a flat bottomed boat with a recess underneath. Air trapped in the recess lifted the boat almost out of the water increasing its speed. Later he built a much more complex model using a clockwork mechanism connected to bellows, the bellows pumped air underneath the boat, as it passed through the water the air acted as a lubricant reducing the boat’s friction and once again increasing its speed. Sadly for Thornycroft his boat needed better engine technology than existed at the time. The patents were never exploited.
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