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Old Jul 26, 2014, 09:47 AM
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United States, IL, Monticello
Joined Sep 2013
26 Posts
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Fiberglassing Skywalker 1680

Hi guys. I recently finished a scratch built Skywalker 1680 and got a lot of good flights in before I clipped the top of the tree and the tail came off and it came crashing down in pieces.

I want to rebuild and was wondering if it would be worth it to fiberglass it. I built it out of EPS so I don't really know how the usual fiberglass techniques will work on it. If you think it's worth it let me know and maybe some tips on how to do it.

Thanks
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Old Jul 26, 2014, 05:38 PM
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Lower Blue Mountains, Australia
Joined Jan 2006
326 Posts
I laid some 48g/m cloth around the boom, and a little bit either side to the fuselage and tail, to stiffen up the wobbley tail. I used Zap Z-Poxy resin. It's excellent on foam and remains a little flexible so it won't crack if it gets a sharp knock (particularly on a hard landing and the tail bounces around).
You could probably get away with even lighter cloth (20g/m?) if you're only using it to smooth repairs/joins rather than adding strength.
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Old Jul 27, 2014, 08:48 AM
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United States, IL, Monticello
Joined Sep 2013
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Thanks for the reply Doc. How was your experience with z poxy? I have read that it is rather thick and not the easiest to use compared to laminating epoxies. I was thinking of going with us composites or ezlam from acp composites.
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Old Jul 28, 2014, 07:03 AM
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United Kingdom
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I've used z-poxy in the past for skinning balsa models, it's really nice to work with. Can't say I've ever found it too thick, if it was, then a little bit of heat will resolve that. I've also used the West Systems epoxy as well, which is what I laminated my 2013 Skykwalker fus with. If you leave the West Systems more than a couple of days, it is much harder to rub back than the z-poxy.

The biggest issue I had when doing this on the Skywalker was getting it to stick well to the foam. If you are 'wrapping' it around the boom, then that won't be a problem, but any 'edges' are prone to lifting.

Chris
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