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Carbon Fibre Sheets |
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timnoyce
Really should get out more Joined: 05 Aug 04 Location: Hampshire Online Status: Offline Posts: 1991 |
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Topic: Carbon Fibre Sheets Posted: 11 Mar 06 at 9:06pm |
or... you could make the general structure from wood or foam and then lay up the carbon around it. That will be easier as you would be able to construct the general component shape otherwise you will need to make a mould to lay up around to gain the shape.
That structure on the 14 is almost definitely pre preg and its hard to tell how the contender mount is made as it looks like its been painted. To make 7mm wall thickness from just carbon would take some SERIOUS layers and it would be highly over engineered i feel... |
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BEARFOOT DESIGN
Cherub 2648 - Comfortably Numb |
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JimC
Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6649 |
Post Options Quote Reply Posted: 12 Mar 06 at 9:37pm |
A mould really wouldn't be a hassle for this structure. As normal pacel tape is your friend (the brown parcel tape is mylar, and epozy just doesn't stick to it). Use some 3 by 1 or something like it strip wood, and make a construction like this. The underneath is the inside dimensions of your turret. The eupper piece is a bit larger all round, and will form the outside surface.
Glue a plate of ply to each side of the inner mould. Leave the outer one loose. Start with a layer of peel ply, then laminate up your turret. I'd use two layers of cloth 45/45 (it with the fibres running diagonlly) then about 6 layers of unidirectional carbon, then another two layers of cloth. Then another layer of peel ply maybe two or three as you're new to this and will probably use too much resin. Now clamp your outer mould on top and leave to cure. When cured pll apart the mould and remove the peel ply. Now to strengthen it some more it would be good to give it some ends. Make two flat plates of cloth, 4 layers, two diagonally, two vertically big emough to cover the ends. Compress between two bits of flat wood, with layers of peel ply between the parcel tape on the wood and the laminate. When finished glue these onto the ends, use generous fillets on the inside and then run a couple of strips of 45/45 carbon down the joins. Finally cut a slot in the ends to clear your centreboard. |
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Olly4088
Far too distracted from work Joined: 10 Jan 05 Location: United Kingdom Online Status: Offline Posts: 424 |
Post Options Quote Reply Posted: 13 Mar 06 at 9:50am |
If you cant find any just make it out of metal and take a trip down to halfords and buy some boy racer styleeeeeee carbon sticker.
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Phantom 1298
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Garry
Really should get out more Joined: 18 Apr 04 Location: United Kingdom Online Status: Offline Posts: 536 |
Post Options Quote Reply Posted: 14 Mar 06 at 12:07pm |
Jim That was just the sort of process I'd planned, although thanks for the tip on laying up diagonally. What is peel ply? I had thought of using plastic sheet (damp proof course or similar) over the mould to prevent it bonding to the mould. Garry Edited by Garry |
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Garry
Lark 2252, Contender 298 www.cuckoos.eclipse.co.uk |
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JimC
Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6649 |
Post Options Quote Reply Posted: 14 Mar 06 at 1:16pm |
Peel ply is a sort off open weave nylon cloth, which doesn't stick to the laminate. It soaks up the excess resin and when everything is cured you peel it off, and are left with a even, if patterned finish, which is also suitable for gluing more epoxy on top of without further preparation.
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Isis
Really should get out more Joined: 01 Sep 05 Online Status: Offline Posts: 2753 |
Post Options Quote Reply Posted: 14 Mar 06 at 1:17pm |
Peel ply is near enough to the stuff they line suits/dresses with... layed over the laminate and then ripped off when cured will give you a much better finish and help with squeezing excess resin out giving you a lighter end product.
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Garry
Really should get out more Joined: 18 Apr 04 Location: United Kingdom Online Status: Offline Posts: 536 |
Post Options Quote Reply Posted: 22 Apr 06 at 1:18pm |
Thanks to everyone for their help and advice. Nearly finished project is below.
Edited by Garry |
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Garry
Lark 2252, Contender 298 www.cuckoos.eclipse.co.uk |
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Isis
Really should get out more Joined: 01 Sep 05 Online Status: Offline Posts: 2753 |
Post Options Quote Reply Posted: 22 Apr 06 at 1:30pm |
Looks good!
How did you decide to do it in the end? |
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Garry
Really should get out more Joined: 18 Apr 04 Location: United Kingdom Online Status: Offline Posts: 536 |
Post Options Quote Reply Posted: 22 Apr 06 at 2:05pm |
Strong carboard box used to make up template. Plastic sheet taped over it so resin wouldn't stick.
2 layers 170 gsm carbon laid up at 45 degrees. Two layers of some CSM I had lyinging about and then 4 layers of carbon laid up with the weave running up/down. Used plastic sheet and block to squeeze out excess resin. Allowed to go off and then hacksaw used to cut off rough edges. Just need to grind chamfer on edges, drill holes and fit. |
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Garry
Lark 2252, Contender 298 www.cuckoos.eclipse.co.uk |
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timnoyce
Really should get out more Joined: 05 Aug 04 Location: Hampshire Online Status: Offline Posts: 1991 |
Post Options Quote Reply Posted: 22 Apr 06 at 2:12pm |
looks good. tres bon
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BEARFOOT DESIGN
Cherub 2648 - Comfortably Numb |
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