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Old 06-25-13, 10:09 PM
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Mark Kelly 
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DP-420 is apparently excellent, I can't get it in small quantities here but I know it's what Nick Crumpton uses. The adhesive you use for the golf shafts is also probably OK. Similarly the surface prep used on the gold heads should be OK.

Don't even think about trying to form the CF into the tube, the guy who suggested this doesn't know what he's talking about.

It is notoriously difficult to mould multiple layers in a tube form which incorporates any hoop strength. The reason is one of those things that's obvious as soon as you think about it: if the first layer of fibres has appropriate hoop strength, it will be unable to move to allow compression of the next layer*. Most manufacturers of tubes get around this by mandrel winding using single tows. Really sophisticated operations can weave using muliple tows.

A second but related problem is anisotropic thermal expansion: CF composites expand a lot across the fibre lay, very little along it. If you don't plan for this in your fibre layeup, the thing can delaminate when cooling from the curing oven. This means the fibre lay must be carefully planned and take into account whether you are laminating over a female or male mould.

*If the fibres are in tension. If they are in compression, they may move but this will cause weave distortion.

Last edited by Mark Kelly; 06-26-13 at 05:43 AM.
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