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    Posted: 05 Dec 14 at 8:42pm
Graeme, you will need lots more beam and angles to make it worth having a triple hulled formation other wise it will have massive whetted area. 

It will be hard to build something like that to any decent weight. I still think that if you are keen on the multihull style you have three real options outside traditional cats.

1. pickup a cheap Vortex - it gives you stable trapeezing or if you want to bast***dise it further get some aluminium and netting bench seats off a hobie and fit them either side. 

2. buy a weta!

3. build something like the 'tri fly' we have. I posted photos ages ago, but can't find them. Basically a buoyant thin central hull with racks coming off either side at big angles and small, shorter hulls on either side outboard of the racks. Very quick and the guys who built it call it a stabilised monohull.
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05 Dec 14 at 8:50pm
Here you go:-




Edited by SimonW99 - 05 Dec 14 at 8:50pm
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iGRF View Drop Down
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Posts: 6499 		Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 05 Dec 14 at 9:08pm
I'm not building a multihull, it is a monohull with a big gap up the middle.

Got to stop thinking in conventional terms.
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Posts: 1345 		Post Options Post Options   Quote davidyacht Quote  Post ReplyReply Direct Link To This Post Posted: 05 Dec 14 at 11:24pm
Skip the inland, A class cat, tortured ply ....
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 14 at 10:29am
Originally posted by iGRF

I'm not building a multihull, it is a monohull with a big gap up the middle.

Got to stop thinking in conventional terms.


Agreed. And the only way this will work is building it ultra light. Even the Minisail Sprite with a concave underside, built at 25 kg could be fun, and if you tweak it to your needs, then it could be epic. I'm sitll not sure about the forward part of the hull, though I can see what you are trying to avoid - cat like behaviour! Why not use preformed foam panels to get the shape rather than plywood? Lots on the Cherub website about it, I'm sure.
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Posts: 478 		Post Options Post Options   Quote iiitick Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 14 at 11:21am
Yes....listen to Uncle Rupert. He of the CVRDA thingy. I spent the last thirty odd years of my working life messing with wood and I do not feel capable of  building any boat more complicated than a stitch and glue Mirror. I thought the way of building prototypes was by shaping a big lump of foam then laminating over it. Is that not how the Rooster Project X was built? It looked horrid  but who cared? Then there is the equipment, bandsaw, table saw, clamps, flat building area, heat, light, sticking plaster, hand tools, more sticking plaster.....I want to see if this idea works. I do not wish to see the next **** years of your marriage ruined by that "festering lump of expensive wood blocking my way to the washing machine".
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 14 at 1:16pm
Given the small inside volume of the boat, a block of foam could well work to carve it from - good thinking iiiiiiiitick.
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Posts: 1312 		Post Options Post Options   Quote Do Different Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 14 at 2:11pm
Genius Itick.

Use a tubular alloy / carbon / old GRP Windsurfer mast sections to make a load bearing space frame.

If you use ply you'll have a heck of task to retro. change any shapes. With the foam core you could simply gnaw the skin off to add or remove as required.

As Itick says it'll look a mess but that's the point of prototypes, a work in progress.

Good luck.

 
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 14 at 2:53pm
Umm, not at all sure about the foam lump option... The Bethwaites mostly do their prototypes in cedar strip.
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Posts: 1312 		Post Options Post Options   Quote Do Different Quote  Post ReplyReply Direct Link To This Post Posted: 06 Dec 14 at 3:08pm
IGrf Acknowledges his lack of skill with wood and short attention span. 

There's the best way to do things and then there's the way that might actually get so far as the water for a given situation.   
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