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Revolutionary Centerboard!! |
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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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 Topic: Revolutionary Centerboard!!Posted: 15 May 06 at 8:34pm |
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Revolutionary Centre board!! I have just invented somthing. Produce a centreboard with a perfect aerodynamic section. Slice it in half so that you have one curved and one flat side on each half, then re fit it with both sides on the same bolt. Drop one half for each tack. Centreboard lift? Am I the new Frank Bethwaite or has it been tried before or am I an idiot. Clever people coment please. Pablo, dont comment.
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tickel
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MRJP BUZZ 585
Really should get out more 
Joined: 05 Mar 06 Location: United Kingdom Online Status: Offline Posts: 1496 |
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Posted: 15 May 06 at 8:38pm |
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i suppose it would work, u will have to try it
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Chris Noble
Really should get out more
Joined: 26 Nov 04 Location: Scotland Online Status: Offline Posts: 710 |
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Posted: 15 May 06 at 8:54pm |
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andy paterson tried something similar to this a long time ago with teh moth, it was a canting centre board that you could tilt from side to side to give additional lift upwind as far as im aware
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Competitive Boat Insurance From Noble Marine
FOR SALE: I14 2 Masts 2 poles 3 Booms, Foils Kites/Mains/Jibs too many to list. |
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Posted: 15 May 06 at 9:01pm |
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I suppose that would work but you would have a problem to stop it vibrating if you acheived any form of speed.....but if you could sort out the structural integrity then its well worth a play.
Doug |
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Bram
Groupie 
Joined: 14 Jul 05 Location: United States Online Status: Offline Posts: 49 |
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Posted: 15 May 06 at 9:07pm |
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Tickel, Whatever you do, don't let the question of having "been tried before" be the test. You may have to develop several generations before you get it right (a process that most simply don't have the stomach for). Your board will be very weak and will likely have to be three times as heavy to get similar flex characteristics (all other variables being the same). I'm not pointing this out to discourage you but only to make sure you take it into consideration. Extra weight in the centerboard is not a deal killer. Bram |
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Bram
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Jack Sparrow
Really should get out more
Joined: 08 Feb 05 Location: United Kingdom Online Status: Offline Posts: 2965 |
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Posted: 15 May 06 at 9:22pm |
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[QUOTE=Chris Noble] andy paterson tried something similar to this a
long time ago with teh moth, it was a canting centre board that you could tilt from side to side to give additional lift upwind as far as im aware[/ QUOTE] What Andy did was nothing like what this guy is suggesting. 
Get yourself a N12 and give it a go. Like Bram says the extra weight of essentially having two boards doesn't have to be deal breaker. It depends on the rules of the class you are designing it for. |
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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: 15 May 06 at 9:32pm |
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Interesting. It wouldn't be great on a daggerboard boat, but on a centreboard boat where the board is weighed in it would be rather interesting. Especially if the class rules didn't permit a gybing board.
Mt main concern would be that in most classes I'd have one season before the idea was banned, and if I'd built a boat with a custom wide case to hold the two foils that would be irritating. |
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Granite
Far too distracted from work
Joined: 12 May 04 Location: Scotland Online Status: Offline Posts: 476 |
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Posted: 15 May 06 at 10:05pm |
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half a symetrical section flat one side and curved the other would not be as low drag as either a proper asymetric section or a normal symetrick board.
It has sort of been done on cats and some of the canting keel yachts with two asymetrick daggerboards. |
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If it doesn't break it's too heavy; if it does it wasn't built right
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Philsy
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Joined: 12 Sep 04 Location: United Kingdom Online Status: Offline Posts: 344 |
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Posted: 16 May 06 at 9:27am |
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How about a centreboard that changes shape? Some sort of material that will
flip one way and then the other - a bit like a fully battened windsurfer sail. |
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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: 16 May 06 at 9:27am |
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Wouldn't need to be exactly flat on the other side though would they - at least as long as you are never going to have both down simultaneously.
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