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Author Topic: Suitable type of glassfibre  (Read 2964 times)

wullie/mk2

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Suitable type of glassfibre
« on: November 14, 2011, 02:58:26 pm »
Will be fibreglassing this Balsa hull with 80g/m2 WOVEN cloth. Will this cloth conform to the hull shape OK. The forward end of the hull goes from convex to concave, although quite gently. Will the cloth be flexible enough for this. The balsa planks are 1.5mm thick so i cannot push too hard to bring the cloth into contact with the wood.

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TailUK

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Re: Suitable type of glassfibre
« Reply #1 on: November 14, 2011, 03:54:08 pm »
Should be ok.  80 gram is quite thin mat so it should conform quite nicely if it's sufficiently "wetted down".  For strength you could add a second layer once the first has set. HTH
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Netleyned

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Re: Suitable type of glassfibre
« Reply #2 on: November 14, 2011, 04:09:48 pm »
Is that a Racing Sparrow Hull I see before me Terry?
Woven Cloth the right way to go at 80gsm
Not Mat TilUK
Ned
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wullie/mk2

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Re: Suitable type of glassfibre
« Reply #3 on: November 14, 2011, 04:34:36 pm »
Hi Ned, well spotted! It is indeed a Racing Sparrow. I'm impressed.

Terry
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andrewh

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Re: Suitable type of glassfibre
« Reply #4 on: November 14, 2011, 05:15:18 pm »
Terry

Yes, certainly the cloth should drape well round this Beautiful hull :}
It may lie better if you put it on at 45degrees to the axis!
I used Twill weave cloth - which is even more "conformable"
You will prolly need two layers to get enough stiffness (but the water loads are extremely low)

dont' hesitate to chop a vent at the bows and be prepared to cut off the moulded bow and add a bulkhead and bow bumber (are they mandatory for RG65s?)

I also wrapped clingfilm/kitchen film/saran wrap as smoothly as possible around the wet moulding to mimimise the microbaloon coat later
andrew
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wullie/mk2

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Re: Suitable type of glassfibre
« Reply #5 on: November 14, 2011, 08:28:59 pm »
Thanks Andrew,
I assume you have no trouble removing the clingfilm. Appreciate the tips.

Terry
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andrewh

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Re: Suitable type of glassfibre
« Reply #6 on: November 15, 2011, 12:55:37 pm »
Terry

Yes, kitchen film comes away from epoxy cleanly (so long as there are no folds)
Yesterday I said:
You will prolly need two layers to get enough stiffness (but the water loads are extremely low)
I was talking rubbish - sorry.  For some reason I expected you to make a complete fibreglass hull (rather than skin the beautiful hulll you have)
One layer quite enough for skinning!
andrew

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HS93 (RIP)

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Re: Suitable type of glassfibre
« Reply #7 on: November 15, 2011, 08:00:45 pm »
this shows how thin you can go , it also shrinks as the resin hits it (well the stuff From deluxe material does) this actually helps get rid of any folds works very well, and it is very light as well if put on right you can also do two coats.


http://www.rcgroups.com/forums/showthread.php?t=329811

Peter
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