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Composit help...

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Old 03-17-2004 | 08:05 PM
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Default Composit help...

OK, how do you do it?

I'm beginning to think this info is slightly classified. A few Google searches later, I feel like I know less now then I did when I started trying to figure this out.

Setting:
I'm trying to build a mosquito class glider for DL or SAL use.

Requirements:
Wingspan: 48" or less
Length: 24" or less
Tail configuration: Conventional only (I hate v-tails, you can't make me like them. I'm already worrying about skin friction, but I am unwilling to reduce drag by making a tail I hate.)
Wing configuration: single dihedral, or tip dihedral
Control configuration:
Rudder: Pull-Pull
Elevator: Would like Pull-Pull, but will consent to pushrod
Break Down: Two-part wing (three part if tip dihedral) and removable horizontal stab. All parts much fit into a 24" long box.

Now that you have an idea of what I'm looking to make, how the hell do you do composites? I'm trying to go for something like the LiftWorx Seeker (www.liftworz.com), but with skinned wings. I'm not opposed to Pod/Boom construction, but how the hell do you do it? I've found a few sites which speak volumes about it, but I cannot find one that was written by someone who has every written instructions for someone they didn't personally know and would be there to answer any questions. I have the basic idea down. Wet, squeegee, lay, wrap, bag, vac, wait, trim, sand, recoat, wait, finish. I think most of my questions are largely technically based:
What sort of combinations of fiberglass, carbon, Kevlar should I use?
How do you do multiple layers?
When do you do multiple layers?
What sort of epoxy do I use?

Closing:
Anyone got a reference for me?

My sanity, or lack there of, thanks you.

Chris
Old 03-17-2004 | 11:04 PM
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Default RE: Composit help...

I know this sounds silly but have you tried Google'ing with the words "vacuum bagging wing"? I did and turned up a whole whack of good looking links.

A buddy of mine made a HLG bagged wing a few years back and he used a single layer of 3/4 oz cloth with a tapered light unidirectional carbon spar under the skin. His spar only went to mid span but in your case it should go all the way to the tip to take the SAL loads better. And if you're making this a two or more piece wing then the joint had better be pretty skookum for obvious reasons...
Old 03-17-2004 | 11:26 PM
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Default RE: Composit help...

Hate to say it but look at rcu! Good bit of info at this link

http://www.rcuniverse.com/forum/Comp...umid_97/tt.htm


Chuck
Old 03-18-2004 | 06:08 PM
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Default RE: Composit help...

ORIGINAL: bomberboy
Hate to say it but look at rcu!
I hate to say it, but I never saw it. Dang...
Same for you Mr. Matthews. I figured other words would turn up good results. I've since found a few good links. One thing that still bugs me a the lack of recommendations on what weight cloth to use for what applications, when/where to use carbon or Kevlar and the never ending contradictions regarding vacuum pressure for various types of foam. Not to mention fuse construction.

I'd make a guide to cover this, but I have no first hand experience, nor do I have limitless resources (yet) to try a ton of stuff and report on it. Bicycle repair I can though...

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