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s.a.l.t.y 
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Joined: 11 Apr 08 Location: Costa del Essex Online Status: Offline Posts: 517 |
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 Topic: Spy photosPosted: 13 Jun 08 at 3:31pm |
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Fat Bottom Girl racing sled. Edited by s.a.l.t.y |
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Posted: 10 Jun 08 at 12:16pm |
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We should get this discussion out of this thread and into a new one, I've not
used marine ply before and I'll explain why, so any help or experience will be very gratefully recieved, I'll start a new thread. |
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mike ellis
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Joined: 30 Dec 05 Location: United Kingdom Online Status: Offline Posts: 2339 |
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Posted: 10 Jun 08 at 11:39am |
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beat me to it Merlinboy.
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600 732, will call it Sticks and Stones when i get round to it.
Also International 14, 1318 |
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Merlinboy
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Joined: 03 Jul 06 Location: United Kingdom Online Status: Offline Posts: 3169 |
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Posted: 10 Jun 08 at 11:10am |
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I'm sure grumpf knows what he is talkin about! when it comes to the construction of boards!! |
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Ross
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Joined: 02 May 07 Online Status: Offline Posts: 1163 |
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Posted: 10 Jun 08 at 11:07am |
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Agreed, but at higher speeds ply will bend and flex where as carbon and glass will be much stiffer and therefore faster. To get the same stiffness in ply as you would with carbon, you would need something that is much thicker and heavier than a foam sandwich panel, it will be much harder to work/shape and be much heavier than a foam sandwich boat. Build it in glass and light foam. You can buy a hell of a lot more glass than you can decent, marine ply. Building in foam sandwich is also much easier than ply! |
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Ross
If you can't carry it, don't sail it! |
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Merlinboy
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Joined: 03 Jul 06 Location: United Kingdom Online Status: Offline Posts: 3169 |
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Posted: 10 Jun 08 at 9:54am |
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Marine ply isnt heavy actually it can be quite light depending on what thickness and verneer you use. Just because something isnt carbon doesnt mean it isnt light!!!
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tgruitt
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Joined: 02 Dec 04 Online Status: Offline Posts: 2479 |
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Posted: 10 Jun 08 at 9:08am |
Marine Ply, sounds heavy and bendy. Do let us know when it goes wrong... |
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Needs to sail more...
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Posted: 10 Jun 08 at 12:12am |
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No, but I have a theory that I can get away with less wetted area by
spreading the weight. It comes from the days when I waterskied. Two skis were always faster than a mono when ski-ing behind a boat with limited power, but you couldn't control them well at speeds above 40 mph, so racing skis were all monos with square tails, like windsurfer speed boards evolved into. So I'm hoping to use no more than the combined planing area of a fast mono speed board, but split across two hulls, so the rig and my weight wont be point loaded, it might work, cats are generally faster and no- ones ever built a successful windsurfing cat of the sort of small dimension I'm planning. Speed courses are broad, so there wont be any significant sideways pressure, so the windward hull wouldn't lift anyway. But I will be worried about the lee hull pearling, coming off at that speed hurts, so I may join the two hulls in the nose before the mast step, or put a foil in place to keep the nose up. Whatever it's just a bit of fun for speed week. |
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mike ellis
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Joined: 30 Dec 05 Location: United Kingdom Online Status: Offline Posts: 2339 |
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Posted: 09 Jun 08 at 10:49pm |
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whats the theory behind having 2 hulls? surely you wont fly a hull to reduce drag on a windsurfer will you?
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600 732, will call it Sticks and Stones when i get round to it.
Also International 14, 1318 |
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Posted: 09 Jun 08 at 10:08pm |
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Because it's not going to be a flat lump of plastic, it's going to be a sort
of mini - micro cat. Two very narrow hulls with a mast track suspended between them. I'm going to make them hollow from marine ply, I think I might have solved the water getting in problem by using kite bladders, inflate them inside the hulls. I might also have a solution for fin drag, by using twin discs, which will also solve the other issue, enabling it to be sailed in the very shallow water where it's at its flattest. Might being the operable word, in wont happen until i build it. |
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