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Revolutionary Centerboard!!
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Granite View Drop Down
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Posts: 476 		Post Options Post Options   Quote Granite Quote  Post ReplyReply Direct Link To This Post Topic: Revolutionary Centerboard!!
    Posted: 15 May 06 at 10:05pm
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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JimC View Drop Down
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 06 at 9:32pm
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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Posts: 2965 		Post Options Post Options   Quote Jack Sparrow Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 06 at 9:22pm
[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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Bram View Drop Down
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Posts: 49 		Post Options Post Options   Quote Bram Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 06 at 9:07pm

Originally posted by tickel

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.

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.

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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 06 at 9:01pm
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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Chris Noble View Drop Down
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Posts: 710 		Post Options Post Options   Quote Chris Noble Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 06 at 8:54pm
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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MRJP BUZZ 585 View Drop Down
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Posts: 1496 		Post Options Post Options   Quote MRJP BUZZ 585 Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 06 at 8:38pm
i suppose it would work, u will have to try it
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tickel View Drop Down
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Posts: 408 		Post Options Post Options   Quote tickel Quote  Post ReplyReply Direct Link To This Post Posted: 15 May 06 at 8:34pm
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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