But once a ship is cruising, the foils reduce the overall effort needed to push the boat forward.
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Two companies, Wavefoil from Norway and Liquid Robotics from the US, have shown the most promise.
While Wavefoil is tackling bigger ships like ferries, Liquid Robotics has developed an autonomous surface vehicle called Waveglider.
The company was acquired by Boeing in 2016 and is currently valued at around $200mn, according toDealroomdata.
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