Carbon fibre
Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=1031
Printed Date: 14 Aug 25 at 8:32pm
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: Carbon fibre
Posted By: m_liddell
Subject: Carbon fibre
Date Posted: 19 Sep 05 at 6:18pm
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Not sure if this is the right place to post this, but since quite a few cherub guys hang out here I'm sure someone can answer my question. It's the only fleet I've seen people mixing epoxy just before the start of a race! When making a cylindrical section (eg. spin pole, mast, tiller extension etc) the (very simplistic) process as I understand it is: 1. Strip any paint and clean with acetone if it's a repair 2. Cut the fibre matt to size(s) needed. (lay up). 3. Goo resin everywhere 4. Stick carbon and use a roller to squeeze out air and make sure carbon is wetted out properly. I guess this is a matter of judgement! 5. Repeat 2 -4 for extra layers Is any form of compression needed in the proccess? Also why do some carbon spars have a glossy smooth finish while some (eg RS800 spin pole) not? Is this purely cosmetic? Surely it must add weight? |
Replies:
Posted By: Guest
Date Posted: 19 Sep 05 at 6:39pm
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I think the 800 pole is glass rather than carbon ... ------------- |
Posted By: LocoP
Date Posted: 19 Sep 05 at 6:45pm
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Sounds like your on the right tack.. You can use special shrink tape avaialble from some composites retailers or peel ply. the latter is like a nylon fabric you use to help get better fibre consolidation and then peel it off when everythings dried. This gives the rougher finish you see and the smoother finish is acheived either by sanding that back and varnishing it or by using shrink tape. Shrink tapes good but its a bit of a pain to use and you need a method of heating it up. Somepeople use a hot air gun rather than a big oven which is what you would use if you had one... Cherub plug coming up - have a look at some of our building / technical pages on http://www.sailingsource.com/cherub - www.sailingsource.com/cherub for a bit more. Ben
------------- Get your heart racing |
Posted By: Chris Noble
Date Posted: 19 Sep 05 at 7:54pm
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yeh, u really dont want excess resin in there, you want as little as possible when laying up laminates, what is it that you are interested in doing?
------------- http://www.noblemarine.co.uk/home.php3?affid=561 - Competitive Boat Insurance From Noble Marine FOR SALE: I14 2 Masts 2 poles 3 Booms, Foils Kites/Mains/Jibs too many to list. |
Posted By: ssailor
Date Posted: 19 Sep 05 at 10:45pm
The difference in shinyness, is quite often related to the resin used - on masts etc on 700s, 800s n so on an final coat of UV proof epoxy is used which produces the shiny effect. ------------- Any one in need of quality carbon fibre work (tillers etc) at decent prices! Int 14 Gbr 1244 'Nucking Futs' The New Port rule!!. |
Posted By: Skiffe
Date Posted: 20 Sep 05 at 9:29am
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The composite shops will HATE me. Ply ply is sold in a dress making shop as suit lining..... Far cheaper. What are you making? But lots of compression is good MORE is better ------------- 12footers. The Only Way to FLY Remember Professionals built the titanic, Amateurs built the ark. |
Posted By: Granite
Date Posted: 20 Sep 05 at 10:21am
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you can wrap some dry glass tape around the layup in a spiral to get the compression it will wet itself out from the resin squezed out of the carbon. it can be difficult to get really smooth but you do get a sacrificial layer of glass over the top of your expensave carbon. Peel ply is V good and you can use electrical tape to get a small ammount of compresion. ------------- If it doesn't break it's too heavy; if it does it wasn't built right |
Posted By: Iain C
Date Posted: 21 Sep 05 at 9:30am
Whoa!!! Tell me more! What do I ask for, 'cos I guess they dont call it peel ply! Have you used it? Does it work? And how does the cost compare? (AUS$ is fine...) Cheers Iain ------------- RS700 GBR922 "Wirespeed" Fireball GBR14474 "Eleven Parsecs" Enterprise GBR21970 Bavaria 32 GBR4755L "Adastra" |
Posted By: Skiffe
Date Posted: 21 Sep 05 at 4:30pm
It should be sold as "suit lining", yes it works because it is the same stuff. as for pricing about half!! ------------- 12footers. The Only Way to FLY Remember Professionals built the titanic, Amateurs built the ark. |
Posted By: Iain C
Date Posted: 22 Sep 05 at 10:32am
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Off to the dressmaking shops then!! They don't by any chance do a 300g/sm carbon/kevlar mix twill weave for use in hems do they? ------------- RS700 GBR922 "Wirespeed" Fireball GBR14474 "Eleven Parsecs" Enterprise GBR21970 Bavaria 32 GBR4755L "Adastra" |
