{i} light motorboat designed to skim above the water at high speeds with only the rear part of its hull touching the water; seaplane; vessel equipped with hydrofoils
A projecting plane or fin on a gliding boat to lift the moving boat on top of the water; also, a gliding boat
A plane, or any of a number of planes, projecting from the hull of a submarine boat, which by being elevated or depressed cause the boat, when going ahead, to sink or rise, after the manner of an aëroplane
A hydroplane is a speedboat which rises out of the water when it is travelling fast