Advice on skinning composite curves


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scandalxk
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Hi Easy Composites,

I am making a pod for my hang gliding instruments.  The pod will be teardrop-shaped lengthways, and roughly oval in the short cross section.  It will have a rectangular recess for the instrument (the size and shape of a small e-reader) to fit in, and a further recess under the instrument (inside the pod) for a battery.  I have formed the core using your high density polyurethane foam, which I intend to skin using an XCR carbon fibre skinning kit.  I've watched your tutorial videos but I still have a couple of questions.

First question: what is the best way to skin compound curves?  I imagine that the cloth could form ridges if I am not careful. Should I snip little pleats in the cloth and allow it to overlap as I go, or can I allow the cloth to double up in the pleats and then lie the pleats down, or would it be better to use multiple narrow strips of cloth, or some other technique?  I can see advantages and disadvantages of all courses.  If overlapping the cloth, could I use artists' spray mount glue to hold it in place until I can wet it with epoxy, or would that prevent the epoxy from sticking?

Second question: what is the best way to deal with inside angles?  I imagine that the semi-cured base coat will "grab" the cloth and not let go - yes?  So maybe I should use a plastic former to push the cloth into the corner without allowing it to touch anything before it arrives at its final position?  And I assume it would be best not to make the inside angles too sharp...?

Thanks in advance!

Oliver

Warren (Staff)
Warren (Staff)
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You can snip the cloth as you suggest or engineer a cut line and overlap the fabric.  It should lay flat then.  Otherwise creases can be hard to flatten.

Most of the time the fabric will stay in place. You can use a former, just make sure it can't stick to resin that bleeds through .



Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
scandalxk
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Warren (Staff) - 4/16/2018 9:17:04 AM
You can snip the cloth as you suggest or engineer a cut line and overlap the fabric.  It should lay flat then.  Otherwise creases can be hard to flatten.

Most of the time the fabric will stay in place. You can use a former, just make sure it can't stick to resin that bleeds through .



Thanks Warren.  What do you mean by "engineer a cut line"?  (Sorry, I'm a complete novice at this.)

Warren (Staff)
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as in place a cut line where it is convenient for you, eg on a corner, in a recess etc etc.


Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
scandalxk
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Warren (Staff) - 4/16/2018 12:25:24 PM
as in place a cut line where it is convenient for you, eg on a corner, in a recess etc etc.


Thanks.  I think I will make a test piece and do some trials.

GO

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