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Building Tips and technical articles. => Building techniques => Topic started by: Paul Allen on September 28, 2010, 02:36:09 PM
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Is there a sizing system for carbon tissue?
I purchased some but it is the same as that supplied
by some kit makers to use in place of ply doublers,I need
something like lightweight silkspan and where can I order it.
Thanks
Paul Allen
Australia
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Paul,
Carbon tissue or carbon veil is available in 2 weights, .2 oz per sq. yd. and .5 oz. I've used both but for different uses. The .2 oz is usually used as a substitute for using silkspan for covering sheeted areas of wings, stabs and elevators and fuselage including the vertical tail. It lighter than silkspan and provides quite a bit of strength to these parts. The .5 oz. I have started using to cover flaps and the stab by vacuum bagging the stuff using epoxy. This really makes flaps as thin as 1/4" quite a bit stiffer than using silkspan.
I know that Randy Smith uses carbon veil between balsa fuse sides and doublers and has great success with it. I still believe that for IC engines, 1/32" plywood doublers are the way to go. I don't question the bond between the fuse side and doubler, but do question the hardwood engine mounts to the balsa doubler. I know he's had great success with this method but I guess I'm just old fashion.
Carbon veil is available from different sources including Randy Smith at Aero Products and Aerospace Composite Products. Last time I looked .2 veil goes for about $10 and yd.
Alan Resinger
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Thanks Alan.
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Hi All,
Can someone provide input on the advantages and disadvantages of the two weights of carbon veil versus 3/4 oz glascloth applied over balsa? I'm trying to maximize stiffness and bending strength for the least weight. (Actually for a jet wing- but similar to a stunter flap)
Will Stewart
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Carbon advantages I am thinking here ??? ??? ??? ??? ??? ??? ??? Z@@ZZZ Z@@ZZZ Z@@ZZZ
Fiberglass .07 first it is a cloth easy to sand easy to lay you set it on bias on the wing skin or fuse and now you control the torsion rigidity.
Frankly I can not see an advantage on using carbon veil. Fibers in all directions and no good strength on any direction. Like Jack of al trades master of none. Then you have to cover it and that is another pain in the .......
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Hi.
I think that the original purpose of carbon veil is to make the laminate electrically conductive. It's a good way to deal with static electricity in devices with sensitive electronics inside, like CT-scanning machines.
Strenghtvise, it's very difficult to use correctly, it tends to suck a lot of resin and it needs lots of compression for good results.
I think it might be worth testing on the inside surface of a molded part (glass-balsa-veil). L
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Hi All,
Can someone provide input on the advantages and disadvantages of the two weights of carbon veil versus 3/4 oz glascloth applied over balsa? I'm trying to maximize stiffness and bending strength for the least weight. (Actually for a jet wing- but similar to a stunter flap)
Will Stewart
Hi Will,
.2 oz. CF veil is .550 oz. per yard lighter, obviously, than the .750 oz glass. That is the main advantage I see. It is NOT as "strong" as woven glass cloth, IMHO. It does give areas like the fuselage more impact resistance than silkspan, meaning less possible little dings....
It is more rigid than silkspan, also, so that is a consideration.
In my understanding, CF veil is compared more to silkspan than fiberglass cloth.
Mongo
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Something else to consider is.. Carbon veil sands alot easier than reg tissue. Ive found you can layer it, sand it, fill it, zap it for more strength. Get it totally uniform - whereas tissue, isnt as versitile.
I usually double carbon the important bits. Open bays - I will Tissue then carbon, - then double tissue, double carbon. provides lots of strength for years after.
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As the late great Rusty Brown told me about carbon veil, when you sand it, don't brush it off. The dust makes great filler when the next coat of dope is applied. Also a note I learned the hard way, "Brush one direction only and don't go back over the area". Once you do it you will know why. H^^
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Hi all I would also like to add that carbon veil does not shrink like silkspan does. Merry christmas all
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Yes the lack of shrinkage is brilliant.
Paul, there is a place in WA that sells it. I just cant remember the name of it....... HB~>
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Dont know if this is a RC jet, but carbon fiber can block signal in 2.4