The RFB X-114 was intended to be able to traverse rougher waters and possibly the open ocean by flying higher than previous ground effect vehicles.
Watch the world's first hydrofoiling ground effect vehicle take off
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Airfish-8 wing-in-ground effect vehicle by Wigetworks
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Ground-effect vehicle - Wikipedia
Wing-in-ground effect vehicles - ScienceDirect
What is a Ground Effect Vehicle?
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How Ground Effect Vehicles Work