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1
hinged leeboards - www.keepturningleft.co.uk
hinged leeboards - www.keepturningleft.co.uk
::2012/10/24::
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2
Wooden Dutch Leeboard Sailboat SCAGAN out of Charlottetown PEI Canada
Wooden Dutch Leeboard Sailboat SCAGAN out of Charlottetown PEI Canada
::2011/05/08::
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3
Barge-Proa sailing upwind with a leeboard.
Barge-Proa sailing upwind with a leeboard.
::2012/11/21::
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4
Glass Fusing Mold made with Kaiser Lee Board
Glass Fusing Mold made with Kaiser Lee Board
::2008/04/27::
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5
A leeboard
A leeboard
::2013/04/22::
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6
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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7
swept back leeboard
swept back leeboard
::2009/02/08::
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8
Skateboarding History - Jason Lee
Skateboarding History - Jason Lee's Board Troubles
::2013/10/12::
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9
J.K. Lee Board Break-A-Thon
J.K. Lee Board Break-A-Thon
::2010/11/12::
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10
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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11
Puddle duck racer capsize on leeboard side
Puddle duck racer capsize on leeboard side
::2013/07/21::
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12
18th Annual J.K. Lee Board Break a thon.
18th Annual J.K. Lee Board Break a thon.
::2012/02/12::
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13
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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14
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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15
Barge-Proa up wind without leeboard.
Barge-Proa up wind without leeboard.
::2012/11/21::
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16
Trip Report: Nov. 18, 2007 Leeboard Hold Down
Trip Report: Nov. 18, 2007 Leeboard Hold Down
::2007/11/19::
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17
Bruce Lee on Hong Kong TV 1969
Bruce Lee on Hong Kong TV 1969
::2008/02/21::
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18
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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19
Swing over lee board
Swing over lee board
::2013/01/03::
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20
Master brandon lee board breaks PT.1
Master brandon lee board breaks PT.1
::2011/06/20::
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21
Master lee Board break setup
Master lee Board break setup
::2011/01/24::
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22
Sean
Sean's Toon2 Leeboard, Cabin tops, and companionway beams
::2012/04/30::
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23
leeboard jig video
leeboard jig video
::2009/09/29::
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24
Leeboard on a windrider 17
Leeboard on a windrider 17
::2010/08/19::
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25
jose cerda and his general lee board
jose cerda and his general lee board
::2010/05/19::
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26
Master Lee board break
Master Lee board break
::2011/01/24::
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27
2012  MATTHEW & RYAN LEE - BOARD BREAKING
2012 MATTHEW & RYAN LEE - BOARD BREAKING
::2012/03/16::
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28
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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29
GM Lee board break
GM Lee board break
::2007/11/05::
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30
Master Brandon lee board breaks pt.2
Master Brandon lee board breaks pt.2
::2011/06/20::
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31
Sara lee board of directors
Sara lee board of directors
::2008/06/09::
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32
Lee @ board and training
Lee @ board and training
::2010/04/18::
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33
Tropical storm lee board gonna take her away
Tropical storm lee board gonna take her away
::2011/09/03::
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34
Glass Forming with the Mold Block System - Author Interview
Glass Forming with the Mold Block System - Author Interview
::2010/04/29::
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35
Fuse It & design it with Petra Kaiser
Fuse It & design it with Petra Kaiser
::2009/02/01::
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36
Mayor Lee & Port of San Francisco Open New Brannan Street Wharf
Mayor Lee & Port of San Francisco Open New Brannan Street Wharf
::2013/07/18::
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37
Reboarding our Hapscut.
Reboarding our Hapscut.
::2012/08/23::
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38
Dutch Sailboats at Governors Island
Dutch Sailboats at Governors Island
::2009/09/15::
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39
Low-Cost Multi-touch Whiteboard using the Wiimote
Low-Cost Multi-touch Whiteboard using the Wiimote
::2007/12/07::
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40
Sailing With Winds of 12 Knots
Sailing With Winds of 12 Knots
::2014/04/14::
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41
Bruce Lee
Bruce Lee 'Enter The Dragon' - Boards Don't Hit Back
::2013/04/26::
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42
Homemade Sailing Canoe - take 3
Homemade Sailing Canoe - take 3
::2010/09/08::
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43
HMONG TV NEWS: Life-time Trustee explained by Lao Family during Protest
HMONG TV NEWS: Life-time Trustee explained by Lao Family during Protest
::2014/03/15::
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44
Kayak Sailing with Home made (DIY) Sail (upwind capable) - Del Valle
Kayak Sailing with Home made (DIY) Sail (upwind capable) - Del Valle
::2013/06/02::
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45
Sailboat Build the AF3 KaaNoo #11
Sailboat Build the AF3 KaaNoo #11
::2013/05/02::
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46
Proa "Proud Mary" - v1
Proa "Proud Mary" - v1
::2013/01/20::
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47
Paul Rodriguez Skateboard Setup Alli Sports
Paul Rodriguez Skateboard Setup Alli Sports
::2010/10/21::
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48
Kayak Sailing DIY polytarp sail
Kayak Sailing DIY polytarp sail
::2010/06/17::
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49
Mr  Duke Lee
Mr Duke Lee
::2013/02/25::
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50
City & CPMC Announce Plan to Rebuild Two of City
City & CPMC Announce Plan to Rebuild Two of City's Seismically Vulnerable Hospitals
::2013/03/09::
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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]

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]

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.[3][4]

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. ^ Robert Temple (1986). The Genius of China. Simon and Schuster. 
  3. ^ "The Tridarka Raider: A Trimaran for Coastal Vagabonds: Deck Plan". WaterTribe. Retrieved 2011-02-08. 
  4. ^ Mike Mulcahy (May 2006). "My Take on Philsboat". Duckworks Magazine. Retrieved 2011-02-08. 

External links[edit]

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