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mike ellis View Drop Down
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Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Topic: Spy photos
    Posted: 09 Jun 08 at 10:49pm
whats the theory behind having 2 hulls? surely you wont fly a hull to reduce drag on a windsurfer will you?
600 732, will call it Sticks and Stones when i get round to it.
Also International 14, 1318
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jun 08 at 12:12am
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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tgruitt View Drop Down
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Post Options Post Options   Quote tgruitt Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jun 08 at 9:08am
Originally posted by G.R.F

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.


Marine Ply, sounds heavy and bendy. Do let us know when it goes
wrong...
Needs to sail more...
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Post Options Post Options   Quote Merlinboy Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jun 08 at 9:54am
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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Ross View Drop Down
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Post Options Post Options   Quote Ross Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jun 08 at 11:07am

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!

Ross
If you can't carry it, don't sail it!
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Merlinboy View Drop Down
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Post Options Post Options   Quote Merlinboy Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jun 08 at 11:10am

I'm sure grumpf knows what he is talkin about! when it comes to the construction of boards!!

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mike ellis View Drop Down
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Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jun 08 at 11:39am
beat me to it Merlinboy.
600 732, will call it Sticks and Stones when i get round to it.
Also International 14, 1318
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jun 08 at 12:16pm
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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s.a.l.t.y View Drop Down
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Post Options Post Options   Quote s.a.l.t.y Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jun 08 at 3:31pm

Fat Bottom Girl racing sled.



Edited by s.a.l.t.y
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Contender 541 View Drop Down
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Post Options Post Options   Quote Contender 541 Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jun 08 at 10:00am
The section on that boom just scares me
When you find a big kettle of crazy it's probably best not to stir it - Pointy Haired Boss

Crew on 505 8780

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