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(naval architecture)
A metal or wooden slab in a casing along the centerline of a sailboat which may be lowered to increase the boat's resistance to lateral motion, and raised when the boat is in shallow water or is beached.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a retractable keel made of metal sheet or, less often, wood, used on small sailing vessels, such as yachts; its primary function is to increase resistance to leeway. The center-board can be retracted into a watertight slot for sailing in shallow waters.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
In fact, it was bombed conventionally no fewer than four times before the Fat Man was dropped, including a little more than a week before Operation Centerboard II began.
"I created a platform in front of the centerboard slot to keep the dog more comfortable and out of any water that enters the boat," Marek said.
He learned about lightweight balsa-wood rafts steered by guaras, various adjustable centerboards. One such raft, loaded with trade goods, was captured in 1526 by the first explorers to sail the Peruvian coast.
Glue (epoxy and silica) and clamp all the centerboard trunk pieces together (K, EE, KY, NN).
It's about making lists and buying charts and agonizing over who makes the fastest spinnaker and, yes, even putting that unnecessary coat of varnish on the centerboard cap ...
In the lower hull, the bottom of the mast step, centerboard trunk and cockpit bailer were ground down until they were flush with the hull.
Some sailboats have permanent keels; many smaller designs have a centerboard that is pushed down through a narrow, open-ended trunk fastened in the center of the hull.
Cut out the centerboard slot in the bottom panel (B).
Since the 0.0007" copper thickness is significant with respect to the 0.006" centerboard thickness, an important feature of the program is that the effect of stripline trace thickness is included in the calculations.
The Seawind 950 comes standard as a cruising model with fixed mini-keels, but there is also an optional racing model with a lowering centerboard for higher pointing performance.
Sailing dinghies are tippy because they have only a short centerboard to provide lateral stability in the water.
The tree number and bolt number (vertical position in the tree) were marked on the 1-inch-thick centerboard that included the pith.