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Old Jul 26, 2014, 10:47 AM
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United States, IL, Monticello
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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, 06:38 PM
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Lower Blue Mountains, Australia
Joined Jan 2006
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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, 09:48 AM
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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, 08:03 AM
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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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Old Jul 30, 2014, 12:07 PM
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Well, I ordered some 1.6 oz fiberglass cloth along with some Zpoxy. I hope it adds a lot of strength but not too much weight. I debated on getting 3/4 or 1.6 oz. Also, I have seen people put the glass on and then pour a puddle of resin on top of it and spread it out from there. It seems to me like it would be better to coat the surface then put down the cloth and then smooth it out using a roller or credit card or whatever. Could someone tell me what is wrong with this method of application?
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Old Aug 17, 2014, 03:14 PM
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Could anybody give me a rough guideline in how much finishing resin to use? Perhaps volume per square foot or meter?

I've never done this before and I really don't want to end up with too much but I don't want to have to take time to make more during the working time.

Thanks
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Old Nov 22, 2014, 12:38 AM
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Quote:
Originally Posted by hangarspace View Post
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
I know its an old post but i plan on wrapping my x8 soon and was wondering if you prefer west systems or z-poxy. Im worried about how well the epoxy will bond to the epo. Thanks
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