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Mini Freesail Cat board thing

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G.R.F. View Drop Down
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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Topic: Mini Freesail Cat board thing
    Posted: 27 Sep 08 at 7:54pm
Not sure where to put this, it's a cat in as much as it has two defined
hulls, it's to be powered by a windsurf rig in a hope to make me feel a bit
safer putting the hammer down in 25 knots plus.

Launched it today, we had no wind, so it was just a float test, see how it
rides in the water and i shoved it about to check it would lift onto the
plane.

It's made of ply, glued, screwed and nailed together from bits costing less
than £100.

It's been an idea that's been kicking around my head for some years,
loads of sketched and doodles but everytime i asked someone to build it
they thought I'd lost the plot, which clearly i have, but if I get proof of
concept out of it, and it gets through the speed course at anything
approaching a respectable speed (anything over 30 knots) and I'll be
happy. It's way too heavy, I daren't even weigh it.

It's got a three stage rocker, final planing wetted surface a minimal 2.4 sq
mtrs, inside two kite bladders should ensure even if it leaks, not too
much water ingress will occur, now it's finished you'll notice the winds
gone.

Ayway i just thought y'all might be interested.







Edited by G.R.F.
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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: 27 Sep 08 at 7:58pm
From sailing Cherubs, I know looks can be deceiving. But I don't think this is going to work very well. Hats of for building it though!


Edited by Ross
Ross
If you can't carry it, don't sail it!
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G.R.F. View Drop Down
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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 27 Sep 08 at 8:15pm
Here's a bet, and I've genuinely no idea, it hasn't had a rig on it.

But I bet i can get that to go a lot faster than Flat Stanley.

Shall we say a tenner?
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Splosh View Drop Down
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Post Options Post Options   Quote Splosh Quote  Post ReplyReply Direct Link To This Post Posted: 27 Sep 08 at 8:21pm

Hi GRF.

Well done, she does look like a fast bit of kit  ...but how would u steer it? Surely it would be a complete nightmare to carve with no obvious rails etc.

Also whats the idea of the angled fin? is it just a anti-weed one or does it give it a boost of performance?

And finally could we see a piccy from the top? , is there staps and all... or would that be telling  

Looking good though!

Mark.



Edited by Splosh
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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: 27 Sep 08 at 8:33pm
G.R.F, your on! As long as you tow me there an back!

Angled fin, bow up trim?
Ross
If you can't carry it, don't sail it!
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G.R.F. View Drop Down
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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 27 Sep 08 at 8:41pm
The weed fin was an idea I'd had a while back to reduce drag, I was going
originally without a fin, then I had this idea for a fin'wheel' then given so
much experimentation best to prove one thing at a time.

Weed fins are foiled at that angle so you're not dragging the foil by
sweeping it back.

Straps and pads not in place yet, wanted to sail it first, get a feel for
where I'll need to put them..

No need to steer it really, speed sailors just blast down a straight course,
get off the other end, turn their board around and sail back, no need to
even gybe.
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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: 27 Sep 08 at 8:48pm
How much sail is it going to be carrying?

Ross
If you can't carry it, don't sail it!
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ratface View Drop Down
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Post Options Post Options   Quote ratface Quote  Post ReplyReply Direct Link To This Post Posted: 27 Sep 08 at 9:06pm
looks like it would be quite interesting to watch
good luck with it Graeme, remember to get some video of it moving.

Ross: seeing as it will take a windsurf rig im sure it will be able to carry a silly amount of sail area, right down to the damn right small in a blow

BLYM
Hertfordshire Sailing team
Uk-Cherub 2644
Laser 4000 -4089
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G.R.F. View Drop Down
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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 27 Sep 08 at 9:35pm
I have a very light 9.5 mtr rig, which is bigger than a moth.

I will also use my variable luff curve invention from a couple of years back, a 7 mtr I managed to get through the
course in a 48 knot wind, but the board I was using back then was slow.
There's a bit about it here
it's good for 31.5 knots on an old dog of a board.

Anyway we can talk all we like, the proofs in the pudding, but it'll be fun using stuff I've built myself, I'm usually
totally useless at making things, i can design them, but make them happen.. no chance.
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Post Options Post Options   Quote Chew my RS Quote  Post ReplyReply Direct Link To This Post Posted: 27 Sep 08 at 9:52pm

GRF - what's the thinking behind why it should be quicker than a single hulled board? 

It reminds me a bit of a pair of waterskis held rigidly together, with a fin poking down...

http://www.sailns14.org - The ultimate family raceboat now available in the UK
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