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acctx
Joined: 28 May 2008 Posts: 76
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Posted: Wed Mar 13, 2013 10:35 am Post subject: how to determine carbon content of a mast |
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no labeling of any kind. Is it possible? |
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bred2shred
Joined: 02 May 2000 Posts: 989 Location: Jersey Shore
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Posted: Wed Mar 13, 2013 11:13 am Post subject: Re: how to determine carbon content of a mast |
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acctx wrote: | no labeling of any kind. Is it possible? |
Not with any high degree of accuracy as far as I'm aware. If you want a ball park, the best bet would probably be to weigh it and compare to the same size/type mast of known carbon content.
Otherwise, you can look at the cut edge of the mast (the base, tip, ferrule) and examine the layup. The carbon will be black. Any glass would be clear/translucent or possibly another color if pigmented resin was used to build the mast.
For example, on my Nolimitz masts, it's very clear from looking at the edge of the mast that there is a thin inner layer of glass (translucent/white), a thick section of carbon (black), and then an outer layer of glass (grey/translucent) - kind of like looking at growth rings on a tree.
sm |
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rigitrite
Joined: 19 Sep 2007 Posts: 520 Location: Kansas City
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Posted: Wed Mar 13, 2013 11:56 am Post subject: |
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You have to bite it, kinda like the old-timers did with a gold coin to make sure it was real.
Real windsurfers can determine carbon content to within 3% using this method. _________________ Kansas City |
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3-phase
Joined: 26 Jan 2007 Posts: 481
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Posted: Wed Mar 13, 2013 6:41 pm Post subject: |
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Weight is the best way to check that.
Jurg
www.windsurfdeal.com |
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U2U2U2
Joined: 06 Jul 2001 Posts: 5467 Location: Shipsterns Bluff, Tasmania. Colorado
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dllee
Joined: 03 Jul 2009 Posts: 5329 Location: East Bay
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Posted: Wed Mar 13, 2013 8:29 pm Post subject: |
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I second weight.
4 lbs for a 460 is close to 80%, unless it's under, then it's more.
5 for a 50%.
6 for a 30%. |
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spennie
Joined: 13 Oct 1995 Posts: 975 Location: Thousand Oaks, CA
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Posted: Thu Mar 14, 2013 10:37 am Post subject: |
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Biting is good, but that 3% inaccuracy will make some posters (posers?) to this Forum crazy.
The most accurate way is to lay the mast on a smooth level surface, then bash it with a sledgehammer until all the fibers are separate, then count each fiber.
Or you could just not worry about it at all, since you're not racing the World Cup, and the difference is subtle. _________________ Spennie the Wind Junkie
www.WindJunkie.net |
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acctx
Joined: 28 May 2008 Posts: 76
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Posted: Thu Mar 14, 2013 3:28 pm Post subject: |
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spennie wrote: | Biting is good, but that 3% inaccuracy will make some posters (posers?) to this Forum crazy.
The most accurate way is to lay the mast on a smooth level surface, then bash it with a sledgehammer until all the fibers are separate, then count each fiber.
Or you could just not worry about it at all, since you're not racing the World Cup, and the difference is subtle. |
Im actually selling a mast and some of the buyers have asked. |
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U2U2U2
Joined: 06 Jul 2001 Posts: 5467 Location: Shipsterns Bluff, Tasmania. Colorado
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Posted: Thu Mar 14, 2013 3:36 pm Post subject: |
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using the weight comparison, you would need to use the quoted weight
or the actual weight to compare ,in that case the quoted carbon may be off
in either case the percentage of error ""could"" be rather high.
As a matter of curiosity what is the length brand and did you weight it ?
Are you certain it has carbon _________________ K4 fins
4Boards....May the fours be with you
http://www.k4fins.com/fins.html
http://4boards.co.uk/ |
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3-phase
Joined: 26 Jan 2007 Posts: 481
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Posted: Thu Mar 14, 2013 5:39 pm Post subject: |
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U2U2U2 wrote: |
Are you certain it has carbon |
that's a good one you are right just because its black does not mean its carbon, often fiberglass is dyed black.
The weight system gets you in a a ball park, if the mast has the correct IMCS rating (you can measure that) then if its 1.8 kg and a other suppliers 100 % carbon 430 cm mast is the same weight you are pretty close to have a similar content. Only Carbon fiber can achieve such stiffness with light weight aka less material. So less Carbon = more weight to get the same stiffness.
Aloha
Jurg
www.winsurfdeal.com |
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