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small, high-powered racing boat designed to skim along the surface of the water. Its hull is so shaped that at high speeds the bow is tilted up out of the water, reducing the effect of frictional drag. Hydroplanes are commonly powered by outboard motors.



a light, high-speed vessel. Because of the special shape of its bottom, during mption the hydroplane gains hydrodynamic thrust, which lifts the nose part and causes a significant general up-floating of the vessel. (It appears to slip or glide along the surface of the water.) As a result, the area of contact between the bottom and the water is reduced, resistance to movement decreases, and the traveling speed increases. Light internal combustion engines and gas turbines are mounted on hydroplanes. Propellers (less often, airscrews) and water jets serve as propelling devices. Hydroplanes are used to carry passengers, for guard duty, in sport races, and for pleasure.


(naval architecture)
A boat which when operated at high speed planes on the surface of the water; the bottom of such a craft is normally a prismatic surface. Also known as planing boat.


1. a motorboat equipped with hydrofoils or with a shaped bottom that raises its hull out of the water at high speeds
2. an attachment to an aircraft to enable it to glide along the surface of water
3. another name (esp US) for a seaplane
4. a horizontal vane on the hull of a submarine for controlling its vertical motion
References in periodicals archive ?
Smith was also convinced that participating in the hydroplane races would offer an opportunity to endorse his boat building business, the Chris Smith & Sons Boat Company, later known as Chris Craft.
The Smith-designed hydroplane went on to win the 1915 Gold Cup race.
It was later revealed that Smith had not been paid in full for building Miss Detroit I, which likely influenced his decision to begin work on a newer, faster hydroplane boat.
The hydroplane races that followed Wood's victory in 1917 became a kind of dynasty.
In 1922, the American Power Boat Association decided to change the rules for the annual hydroplane race, both to promote more competition among boat owners and increase entries.
When Bay City's Hilda Mueller competed, she picked the one activity in which men and women vied for the same honors: hydroplane boat racing.
That opportunity came in late August 1929, when veteran hydroplane boat racer Loretta Fillion of Lansing challenged her peers to meet her at the upcoming Eastern Michigan Water Carnival races.
Using what she learned in the first heat about Fillion's racing tactics, Mueller went on with a patched-up hull to defeat the more seasoned sailor--the reigning state women's outboard-powered hydroplane champion--in the next two heats.
In early 1930, after a long winter in Bay City, Mueller decided that outboard hydroplane racing was for her and became a professional driver within the National Outboard Association.
While the life of a hydroplane champion proved exciting, it provided very little prize money.