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1
Barge-Proa sailing upwind with a leeboard.
Barge-Proa sailing upwind with a leeboard.
::2012/11/21::
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2
Skateboarding History - Jason Lee
Skateboarding History - Jason Lee's Board Troubles
::2013/10/12::
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3
Glass Fusing Mold made with Kaiser Lee Board
Glass Fusing Mold made with Kaiser Lee Board
::2008/04/27::
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4
leeboard jig video
leeboard jig video
::2009/09/29::
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5
How to make a perfectly smooth Kaiser Lee Board kiln shelf.
How to make a perfectly smooth Kaiser Lee Board kiln shelf.
::2011/12/20::
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6
swept back leeboard
swept back leeboard
::2009/02/08::
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7
Wooden Dutch Leeboard Sailboat SCAGAN out of Charlottetown PEI Canada
Wooden Dutch Leeboard Sailboat SCAGAN out of Charlottetown PEI Canada
::2011/05/07::
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8
Trip Report: Nov. 18, 2007 Leeboard Hold Down
Trip Report: Nov. 18, 2007 Leeboard Hold Down
::2007/11/19::
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9
Sean
Sean's Toon2 Leeboard, Cabin tops, and companionway beams
::2012/04/29::
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10
hinged leeboards - www.keepturningleft.co.uk
hinged leeboards - www.keepturningleft.co.uk
::2012/10/24::
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11
J.K. Lee Board Break-A-Thon
J.K. Lee Board Break-A-Thon
::2010/11/12::
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12
Puddle duck racer capsize on leeboard side
Puddle duck racer capsize on leeboard side
::2013/07/21::
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13
A leeboard
A leeboard
::2013/04/22::
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14
Bruce Lee on Hong Kong TV 1969
Bruce Lee on Hong Kong TV 1969
::2008/02/21::
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15
Barge-Proa up wind without leeboard.
Barge-Proa up wind without leeboard.
::2012/11/21::
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16
Leeboard on a windrider 17
Leeboard on a windrider 17
::2010/08/18::
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17
How to Pronounce leeboard
How to Pronounce leeboard
::2014/10/23::
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18
Swing over lee board
Swing over lee board
::2013/01/03::
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19
B-Rad Lee Board Breaks For 4th Degree Black Belt
B-Rad Lee Board Breaks For 4th Degree Black Belt
::2013/12/19::
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20
fox whiskers lee board tweak
fox whiskers lee board tweak
::2014/09/21::
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21
Master brandon lee board breaks PT.1
Master brandon lee board breaks PT.1
::2011/06/19::
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22
Board Breaking at the 2012 J.K. Lee Board Break-a-Thon
Board Breaking at the 2012 J.K. Lee Board Break-a-Thon
::2012/02/11::
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23
PIA National
PIA National's Johnny Lee's Board Meeting Excerpt on 09/22/13 in Las Vegas, NV
::2013/09/26::
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24
Sara lee board of directors
Sara lee board of directors
::2008/06/09::
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25
18th Annual J.K. Lee Board Break a thon.
18th Annual J.K. Lee Board Break a thon.
::2012/02/11::
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26
Master Brandon lee board breaks pt.2
Master Brandon lee board breaks pt.2
::2011/06/19::
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27
Master lee Board break setup
Master lee Board break setup
::2011/01/24::
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28
jose cerda and his general lee board
jose cerda and his general lee board
::2010/05/18::
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29
Master Lee board break
Master Lee board break
::2011/01/24::
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30
GM Lee board break
GM Lee board break
::2007/11/05::
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31
Rachel breaking her boards from the JK Lee Board break a thon.
Rachel breaking her boards from the JK Lee Board break a thon.
::2013/03/03::
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32
2012  MATTHEW & RYAN LEE - BOARD BREAKING
2012 MATTHEW & RYAN LEE - BOARD BREAKING
::2012/03/15::
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33
Sidney Lee - Board Sword at 20th Annual UC Berkeley CMAT20 3-24-2012
Sidney Lee - Board Sword at 20th Annual UC Berkeley CMAT20 3-24-2012
::2012/03/27::
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34
Lee @ board and training
Lee @ board and training
::2010/04/17::
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35
Tropical storm lee board gonna take her away
Tropical storm lee board gonna take her away
::2011/09/03::
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36
Unbreakable Leeboards
Unbreakable Leeboards
::2013/02/08::
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37
Bobby Lee Game Turn example
Bobby Lee Game Turn example
::2013/10/21::
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38
Fuse It & design it with Petra Kaiser
Fuse It & design it with Petra Kaiser
::2009/02/01::
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39
Bruce Lee
Bruce Lee 'Enter The Dragon' - Boards Don't Hit Back
::2013/04/26::
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40
Bobby Lee Review
Bobby Lee Review
::2014/08/09::
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41
Glass Forming with the Mold Block System - Author Interview
Glass Forming with the Mold Block System - Author Interview
::2010/04/28::
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42
Dutch Sailboats at Governors Island
Dutch Sailboats at Governors Island
::2009/09/15::
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43
Reboarding our Hapscut.
Reboarding our Hapscut.
::2012/08/22::
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44
essai canot 2
essai canot 2
::2009/10/08::
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45
Hapscut - motoring into the wind
Hapscut - motoring into the wind
::2012/11/12::
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46
Bobby Lee is on Kickstarter
Bobby Lee is on Kickstarter
::2013/10/09::
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47
Jackie Chan is awesome.... breaking cement blocks while holding an egg
Jackie Chan is awesome.... breaking cement blocks while holding an egg
::2013/04/02::
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48
Sailing canoe with homemade rigging
Sailing canoe with homemade rigging
::2014/09/10::
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49
Bruce Lee Physical Feats as a Real Fighter
Bruce Lee Physical Feats as a Real Fighter
::2010/03/19::
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50
Homemade Sailing Canoe - take 3
Homemade Sailing Canoe - take 3
::2010/09/08::
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RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
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A Dutch sailing barge showing its stowed leeboard.
Thames sailing barges in the East Swin, the vessel in the foreground has a leeboard deployed.
Modern sharpie fitted with leeboards
A modern boat fitted with leeboards, the Centennial designed by Ted Brewer in 1979.

A leeboard is a lifting foil used by a sailboat, much like a centerboard, but located on the leeward side of the boat. The leeward side is used so that the leeboard is not lifted from the water when the boat heels, or leans under the force of the wind.

History[edit]

Leeboards existed in China from at least the eighth century on warships that "held the ships, so that even when wind and wave arise in fury, they are neither driven sideways, nor overturn".[1] Leeboards used to stabilize the junk and to improve its capability to sail upwind, are documented from a book by Li Chuan. The innovation was transmitted to Portuguese and Dutch ships around 1570.[2][3] "The Portuguese experimented with caulking their vessels in the Chinese manner and the Dutch probably added leeboards to their craft that were copied from Chinese models."[4]

Leeboards have been used by relatively large inshore sailing vessels used for transport since 1570, such as Dutch barges and Thames barges. For these boats, leeboards provided the advantages of shallow draught for working close inshore and an unobstructed hold for cargo. They were also easier to build than a large centreboard would have been.

Current designs[edit]

Leeboards are no longer common in commercially built boats, because many people consider them inelegant and awkward. They are far more common in home-built boats, especially the Puddle Duck Racer and stitch and glue type sailboats. Leeboards simplify construction of the hull, as they are attached to the outside and do not require holes in the hull, which can leak. Since centerboards are retractable, they require a large, watertight trunk to hold them in place when retracted, and this occupies what otherwise might be useful space in the cabin or cockpit of the boat. Use of leeboards, while it adds complexity to the process of tacking, leaves the floor of the boat unobstructed.

According to traditional design principles, a boat utilizing a leeboard either needs to have two retractable leeboards, one on each side, or a method of removing the leeboard and attaching it to either side while under way, because nearly all sailboats tack to work their way upwind (with the exception of the proa). However, some small sailboat designers claim to have created seaworthy vessels with only a single, fixed leeboard.[5][6]

On a traditional two-leeboard (or non-fixed leeboard) design, they are designed so that the windward board can be retracted when it isn't needed to reduce drag. Unlike centerboards, which are symmetric along the boat's axis, leeboards are often asymmetric, so they more efficiently provide lift in one direction only. Some fast racing scows use bilgeboards, which are mounted between the centerline of the hull and the sides, specifically so that they can use a pair of asymmetric foils for maximum lift and minimum drag.

See also[edit]

References[edit]

  1. ^ Li Ch'üan (759). Manual of the White and Gloomy Planet.  cited byRobert Temple (1986). The Genius of China. Simon and Schuster. 
  2. ^ Donald F. Lach. (1977). Asia in the making of Europe. Volume II, A Century of Wonder. p. 403.
  3. ^ Robert Temple (1986). The Genius of China. Simon and Schuster. 
  4. ^ Donald F. Lach. (1977). Asia in the making of Europe. Volume II, A Century of Wonder. p. 403.
  5. ^ "The Tridarka Raider: A Trimaran for Coastal Vagabonds: Deck Plan". WaterTribe. Retrieved 2011-02-08. 
  6. ^ Mike Mulcahy (May 2006). "My Take on Philsboat". Duckworks Magazine. Retrieved 2011-02-08. 

External links[edit]

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