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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 ?
Lucas Oil Motorsports Hour - Versus IHBA Drag Boat Series - SPEED, 7 events Lucas Oil Late Model Dirt Series - SPEED, 35 events Lucas Oil Pro Pulling Series - ESPN2 and Versus, 290+ events World Series Off Road Racing - Speed, 18 events NASCAR West Racing Series - SPEED ASA Modified West Series - 7 events
She is a businesswoman, boxing champion, poker player and drag boat builder and racer.
July 11-12: Columbia Drag Boat Association's Bi-Mart Summer Clash, 2,500 participants, Dexter Lake, various hotels
Eleven years later, he is a three-time drag boat champion with three class records who spends many of his weekends skimming over the water at speeds over 180 mph.
The Lake Havasu region of Arizona, which is close to Las Vegas and borders California, is known for its high per capita concentration of Boats, Boat Manufacturers, Annual Boat Manufacturers Regattas, Drag Boat Racing, and is a popular destination for retirees, Recreational Vehicle owners, Motorcycle enthusiasts and "weekend" boaters from California, Nevada and Arizona.
General Tire is a proud supporter of Lucas Oil Off-Road Racing, Chili Bowl, Pro-Pulling, Late- Model Dirt Series, Drag Boat Series, Boost Mobile FreestyleMx.
Can Am Challenge Drag Boat Racing: June 13-14, Dexter Reservoir, Lowell.
The Columbia Drag Boat Association (CDBA) will take over Dexter Lake on Saturday and Sunday for its Summer Clash event, expected to draw 70 drag boat racers from Oregon, Washington, Nevada, California and Canada.
The Ming thing: Lake Ming in Bakersfield will host the KCBC Drag Boat Races and Alcohol Boat Shootout Aug.