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Old Feb 17, 2013, 01:19 PM
Registered User
Jets:)'s Avatar
New Zealand, Auckland
Joined Aug 2006
133 Posts
Carbon vs kevlar sock

Hi guys i have a question i need answered so i can place order
From CST.

I have been bagging wing spars i make using carbon sock , how ever
Im wondering if i can do it with kevlar and save some money(bonus!)

What will i loose and what will be gained from using kevlar rather than carbon?

Wings spars are for two meter ds gliders weighing 2-3kg
Spars are carbon caps with pine shear webbing, then sock over the outside for burst strenght
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Old Feb 17, 2013, 01:55 PM
I am actually really slow
SlowBarless's Avatar
Joined Jun 2008
983 Posts
You're probably better off using glass sock if you want to save money. Haven't ever seen Kevlar used in wingspars before, I'm sure there's a good reason.
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Old Feb 17, 2013, 02:48 PM
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Upvector's Avatar
Hamilton, CANADA
Joined Sep 2009
347 Posts
I've not heard of using Kevlar sock on the spar, (normal TD or F3B, J gliders) but definitely Kevlar tow, or string as a spiral wrap. It has the qualities of holding the carbon spar caps onto the spars, (as its qualities are good in tension), when under bending loads. That prevents the cf spars from sliding / shearing, which quickly leads to spar failure under hi-g forces.

The kevlar sock should work well, but might be a bit of overkill if you are concerned
about weight..( but for ds'ing.. probably a good idea considering the bending loads)

Joe Manor, the DS'ing guru might have some insight into that..

$0:02 Cdn worth
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Old Feb 18, 2013, 12:40 AM
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Jets:)'s Avatar
New Zealand, Auckland
Joined Aug 2006
133 Posts
In joes d60's hes using a hybrid sock of carbon and kevlar, he said its does the job
Well enough.

Thanks for your ideas
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Old Feb 22, 2013, 04:12 PM
Master of the Wind
G Norsworthy's Avatar
United States, CA, San Jose
Joined Sep 2008
1,224 Posts
You can always do the math.

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