| Rossiter Pintail Mortagne sur Gironde, near Bordeaux |
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| Laser 28 - Excellent example of this great design Hamble le rice |
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| Laser 140101 Tynemouth |
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List classes of boat for sale |
Revolutionary Centerboard!! |
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charlie w 
Groupie 
Joined: 31 Oct 05 Online Status: Offline Posts: 84 |
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 Topic: Revolutionary Centerboard!!Posted: 17 May 06 at 1:00pm |
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Don't most boards "flex" beneath the hull anyway? The prob we always have with Gybing boards (aka accentuating the lift/wing shape) is that they can fall out of gybe, and end up giving you lift the wrong way...! You could try a movable max chord, which swings side to side where the system comes out of the top of the blade - like an Int 14 rudderblade. I like the idea of a flexier blade that you could lock off in either "gybe" as that would surely present a lifted shape to the water, and thus more lift, without the downside of needing to keep pressure on the blade to keep it in gybe. Mind you - that is awfully tweaky....and that from a 505 sailor...! Cheers CW
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Quality never goes out of fashion.
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I luv Wight
Really should get out more 
Joined: 28 Jan 05 Location: United Kingdom Online Status: Offline Posts: 628 |
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Posted: 17 May 06 at 10:37pm |
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It's been done before in 1993 - a college project and tested in toppers.
Jim Hill-Jones - moth sailor was involved in this project and look - adam may as a nipper! 
I think the problem was changing the foils during tacks, and clearing the boom with a completely lifted half-foil. Edited by I luv Wight |
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I luv Wight
Really should get out more
Joined: 28 Jan 05 Location: United Kingdom Online Status: Offline Posts: 628 |
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Posted: 17 May 06 at 10:49pm |
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The lift from a foil is constant ( or depends on the sail force which depends on righting moment ), so a more efficient foil gives less drag, not more lift.
More efficiency means less area, which is fine if it everything is working good. But a nasty tack or a gust may mean a foil overload and stall, so small low drag foils are not always good. Alternatively, the same area but used at less angle of attack to keep the same lift, but then the wetted surface is the same, and drag may not be significant. |
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tickel
Far too distracted from work 
Joined: 21 Dec 05 Location: United Kingdom Online Status: Offline Posts: 408 |
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Posted: 18 May 06 at 9:32am |
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And you all thought that the centreboard was just too
stop you drifting sideways into the dam!! |
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tickel
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HannahJ
Really should get out more
Joined: 23 Jul 05 Location: United Kingdom Online Status: Offline Posts: 861 |
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Posted: 20 May 06 at 9:21pm |
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or as a depth sounder
 Out of interest, and not really onthis topic, does the width of the centreboard/daggerboard have any effect on upwind progress? |
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MIRROR 64799 "Dolphin"
The pessimist complains about the wind; the optimist hopes it will change; the realist adjusts the sail |
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NickA
Really should get out more
Joined: 30 Mar 05 Location: United Kingdom Online Status: Offline Posts: 784 |
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Posted: 24 May 06 at 11:13pm |
B*££#R class rules. Once it's painted white who's to know!!!! Though in truth my play boat already conforms to no known class and I'm sick of taking chunks out of the foils with trap hook. Gel coated foam is just too fragile. Carbon wrapped foam sounds a good bet. How about aluminium sheet wrapped round wooden forms? |
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JimC
Really should get out more
Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 26 May 06 at 8:51am |
The only thing is if you do get caught you probably cop a rule 69 protest and a two year ban from ISAF... We sign up for the game, rules and all. If you don't like the rules then change class rather than deliberately break them. |
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NickA
Really should get out more
Joined: 30 Mar 05 Location: United Kingdom Online Status: Offline Posts: 784 |
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Posted: 01 Jun 06 at 2:13pm |
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or better still .... get the class rules changed to something sensible. When changes that save cost or increase strength but don't change performance are banned, but changes which evidently do change performance, but cost a mint (like buying a new boat every year) are allowed, you have to ask who the rules are written for, the sailors or the manufacturers? However, rest assured, any boat I race meets the rules pertaining to that race. But happily there's more to sailing than racing. |
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