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Topic: Centreboard

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	www.centreboard.com.au /index.htm (197 words)

	Centreboard - Definition, explanation
		A centreboard is a form of movable keel on a small sailing boat or dinghy which can be moved to lower the draught (or depth) of the vessel.
		A centreboard is a foil that converts lateral slipping of the boat into a lateral force that resists the slipping.
		A retracting centreboard is more complex than a fixed keel, and most take up space inside the hull of the boat that could otherwise be used for passenger accommodations.
	www.calsky.com /lexikon/en/txt/c/ce/centreboard.php (482 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-29)
		A centreboard is a retractable object of lateral resistance which pivots out of a slot in the hull of a sailboat, known as a centerboard trunk.
		The pivoting ability allows the centreboard to be raised to operate in shallow waters, to reduce drag when the full area of the centreboard isn't needed, or to remove the boat from the water as on a trailer.
		A centreboard is used to provide lift to counter the lateral force from the sails.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=centreboard (460 words)

	Adding Centreboard Trunk Reinforcements
		Gybing centerboards create a point load on the side of the centreboard trunk when the airfoil section starts to come into the centreboard trunk as the centreboard is raised.
		This point load is applied to the centreboard trunk wall on an arc described by the point on the centreboard rotating around the CB pin as the board is raised.
		The actual centreboard bolt hole has yet to be drilled and sealed; that is best done after fitting the new centreboard into the trunk to verify the appropriate location of the centreboard bolt hole.
	www.int505.org /CBTrunkReinforcements.htm (1224 words)

	Sailing Club: Sailing Theory
		Centreboard: The "fin" which protrudes from the bottom of the hull.
		Centreboards are pivotted about a pin and can be raised or lowered as required.
		Daggerboard: The daggerboard is a centreboard which, instead of pivotting about a pin, is raised or lowered vertically.
	quis.qub.ac.uk /sailing/techinfo/parts.htm (795 words)

	INTERNATIONAL OLYMPIC COMMITTEE - SPORTS
		A single-handed centreboard dinghy class, often called "the small Finn", which is the smallest Olympic-class boat and is used for women-only competition.
		Colloquial for "spinnaker", a large, billowing, often colourful sail used to obtain greater boat speed during downwind sailing, usually set in front of or instead of the jib and carried by the 470, 49er and Soling Olympic classes.
		A single-handed centreboard dinghy class, the most popular one-design class in the world, used for open competition in the Olympic Games.
	www.olympic.org /uk/sports/programme/equipment_uk.asp?DiscCode=SA&sportCode=SA (532 words)

	Centreboard
		A centreboard is a form of movable keel on a small sailing boat or dinghy which can be moved to lower the draught (or depth) of the vessel.
		A centreboard is a foil that converts lateral slipping of the boat into a lateral force that resists the slipping.
		A retracting centreboard is more complex than a fixed keel, and most take up space inside the hull of the boat that could otherwise be used for passenger accommodations.
	www.omniknow.com /common/wiki.php?in=en&term=Centreboard (1081 words)

	C. Bowyer Vaux - Canoes and Canoeing - Part 1
		Therefore, when the centreboard was introduced, it was placed well forward so as not to cramp the open cockpit space which the skipper occupied.
		The rig necessary with such a disposition of centreboard, in order to preserve the balance, was a large sail forward and a small sail aft.
		The centreboard is dropped when sailing on all points of the wind, except just before it, and may he left down then as ballast without any appreciable loss of speed.
	dragonflycanoe.com /vaux1894/part3.htm (2585 words)

	Argo d.o.o.
		Due to the configuration of the stem, which is above all adjusted to the use of a retractable centreboard, its competitive characteristics are not emphasized, especially for the conditions of the Adriatic sea.
		Owing to the demand of the customer that it should be possible to pull the centreboard and the 200 kg bulb to the bottom of the stem, the underwater part of the stem is flat and relatively wide on the water line.
		The deck and the cockpit are organized according to the principle “less is more”, so that the stress is put on sailing, not on steering and handling the boat and their systems.
	www.argo.si /vsebina/en/nautica/stran/2003071913295664 (2324 words)

	Grace O'Malley Will Sail Again
		I wanted the centreboard in the middle for a reason I will come back to later which would mean a seating position with one leg on each side of the centreboard trunk.
		The centreboard deserves a little chapter of its own: Since the boat is small and narrow and I am too old to appreciate falling into the water all the time the stability of the boat was a high priority.
		To get the bulb to pass through the slot in the centreboard trunk this would have to be designed with a "adapter"-piece filling out the gap between the 3" wide opening in the centreboard trunk necessary for the bulb to pass and the 1" width of the actual centreboard.
	www.duckworksmagazine.com /02/articles/grace/index.htm (2241 words)

	OKDIA Technical Manual 4 Building Guide
		Geometrically construct the centreboard outline from the parameters given in the plans and cut to the exact measured shape.
		The design of the centreboard arm and the height of the deck line should be decided at this stage as the correct operation of the board depends on these fitting together properly.
		Trim the centreboard case top to the correct height and glue on the deck supports using 20mm spacers to maintain the correct slot width.
	www.okdia.org /technical/manual/tm4_buil.php (2766 words)

	Centreboard optimisation - Boat Design Forums
		Due to the centreboard case adjustments, there is plenty of room to install a deeper centreboard of the same width.
		Centreboard and rudder area both contribute to lateral resistance and so by altering the area of one foil only will change the position of "Centre of Lateral Resistance" CLR.
		One thing I didn't mention is that the centreboard case is disproportionately longer than the distance it was moved forward (as if it were designed for a longer foil!), so I could, if absolutely necessary, move the centreboard aft (but not forward).
	www.boatdesign.net /forum/showthread.php?t=10902 (1710 words)

	3.7 Tuning
		Centreboard: Bruce Farr designed the boat with a centreboard that was raked aft, and had the centre of effort aft as well.
		As you go underneath the centreboard, the boat will flip, and suddenly you will find yourself lying on top of the board, with the mast downwind of you, your weight having stopped the boat's natural tendency to go right upside down again.
		One owner has claimed an improvement on this technique: instead of slipping your body under the centreboard, he says that you should reach right down under the water and strongly grab the underwater gunwale, so that as the boat does the flip, you actually arrest it in the upright position, and save time.
	www.sentech.co.nz /farr37/tuning.html (5701 words)

	Rules Relative to the Construction of Lake Sail and Steam Vessels [a machine-readable transcription] : Centreboard Case
		All vessel [sic] hereafter built shall have the centreboard through the centre of the keel, and constructed as per plate.
		The head ledges of centreboard cases in vessels of 200 tons shall not be less than 6 x 10 inches, 300 tons 7 x 11 inches, 500 tons 2 x 12 inches, 800 tons and over 9 x 14 inches.
		The plank for centreboard case, for one-third the height from keelson to deck, shall be one inch thicker than the head ledges, the second third shall be same thickness as head ledges, and the remainder or top strakes, can be one inch less than head ledges.
	www.hhpl.on.ca /GreatLakes/Documents/Rules1866/default.asp?ID=s017 (408 words)

	15 foot Cruising Dinghy - annex to Hostellers Sailing Club site
		The centreboard of the Roamer is a steel plate whereas that for my boat is a much thicker grp aerofoil the lower part of which is lead filled, hence it is heavier and has a lower centre of gravity.
		This reduces load on the centreboard lifting cable and also reduces the contact loads between board and case when the boat is heeled.
		Indeed, this centreboard is quicker and easier to raise while sailing than are most wooden ones since the winch easily overcomes the effect of weight or water pressure acting sideways on the board.
	www.btinternet.com /~sail/boatbuild03.htm (7286 words)

	Centreboard casing jammed by sand or stone
		to prevent centreboard jamming due to sand or stone.
		Two years ago, the shore in front of our Wayfarer dinghy park at the Ho Bugt Sejlklub was damaged by a major storm, and the beach had to be built up with fresh sand that was especially sharp.
		This moved the narrow point between centreboard and casing 50 – 60 mm's up into the casing, and resulted in no jamming, as we had often seen with a centreboard with the newer "cigar-nose-shaped" leading edge.
	www.wayfarer-international.org /WIT/useful_skills_of_all_kinds/CB_jammed_sand_stone4.html (519 words)

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		Centreboard's unique investment products and strategies reduce risk while still enabling the investor to achieve high levels of return.
	www.centreboard.com.au (177 words)

	B14 Class rules
		Padding may be used in the centrecase - the thickness of such padding may be varied to provide an optimum friction fit for the centreboad, but it shall be of substantially uniform thickness for the length of the centrecase.
		A line ol shockcord may be tied or hooked through the rope handle or holes in the top of the centreboard and attached to prevent loss in the event of a capsize.
		In the event of damage to hull, deck centreboard, rudder, mast, boom, rigging, accessories or equipment, necessary repairs may be mate thereto without violation of these Rules provided repairs are made in such a way that the essential shape or other characteristics are not matelially affected.
	asso.ffv.fr /b14/Pages/Rules/rules95.htm (1294 words)

	Flying Dutchman Class Manual
		In the way of centreboard slot, the keelband shall be duplicated and shall overlap the centre keelband by not more than 50mm at each end.
		A stop shall be fitted on the centreboard to prevent it from being lowered farther than 1060mm under the hull.
		It shall be possible to raise the centreboard into its case by rotating it so that the leading edge of the centreboard is close to and approximately parallel to the keel.
	www.sailingsource.com /sailfd/rules.html (6287 words)

	centreboard - OneLook Dictionary Search
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		Centreboard : Online Plain Text English Dictionary [home, info]
		Words similar to centreboard: centerboard, drop keel, sliding keel, more...
	www.onelook.com /?w=centreboard (116 words)

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