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Author Topic: Some expert advice, please...  (Read 2313 times)

Patrick Henry

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Some expert advice, please...
« on: October 28, 2011, 09:39:33 PM »

Ok, just going through my list of bits to get for my Gemini cat...

I want to change the horrible wooden framework that holds the two hulls together and supports the main mast for carbon rod...but(here comes the question)where do I get carbon rod and what sort of diameter would I need?

This is how I'm thinking of doing it....
 


Instead of this...



Any advice, guys?




Rich
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tobyker

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Re: Some expert advice, please...
« Reply #1 on: October 28, 2011, 10:49:32 PM »

I have been looking at Carbon rod for another project. It looks to me as if carbon tube might be a better bet for you - it would be stiffer and might be easier to fix at the ends. It's difficult to recommend a size as there's not much in the photos to scale them by.
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john s 2

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Re: Some expert advice, please...
« Reply #2 on: October 28, 2011, 11:08:34 PM »

Just possibly an old fishing rod may provide what you require.John.
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Patrick Henry

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Re: Some expert advice, please...
« Reply #3 on: October 29, 2011, 07:48:33 AM »

Sorry, my mistake...I should have written 'tube' instead of 'rod'...



Fishing rods...I tried a old rod I found, but the sections are tapered, aren't they?


Rich
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Patrick Henry

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Re: Some expert advice, please...
« Reply #4 on: October 29, 2011, 08:51:19 AM »

It's been suggested that alloy tube from B&Q will do the job nicely, so I'm going to try that first, I think.




Rich
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unicorn

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Re: Some expert advice, please...
« Reply #5 on: October 29, 2011, 09:12:49 AM »



                  Look for a shop that specializes in selling kites.
                                                                                      unicorn
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richald

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Re: Some expert advice, please...
« Reply #6 on: October 29, 2011, 09:28:11 AM »

try

http://www.giantcod.co.uk/carbon-fiber-tube-hollow-d60%C3%83%C2%97106050%C3%83%C2%971m-5pcs-p-403653.html

if you cast around on the GiantCod website you'll find they do 3mm and 6mm tubes and strip and rod too

Richard
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Patrick Henry

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Re: Some expert advice, please...
« Reply #7 on: October 29, 2011, 09:50:37 AM »

Now we're getting somewhere...thanks Richard!

I guess 6mm would be the size to go for to make up the cross spars?



Rich
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CJ1

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Re: Some expert advice, please...
« Reply #8 on: October 29, 2011, 10:00:16 AM »

The r/c helicopter guys use a lot of carbon fibre tube and rod. look on their websites.
Try here:
http://www.easycomposites.co.uk/Category/Carbon-Fibre-Products/Carbon-Fibre-Tube.aspx
Chirs
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tony23

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Re: Some expert advice, please...
« Reply #9 on: October 30, 2011, 10:52:44 PM »

cheapest place for carbon tube would be a kite supplier model shops tend to ask the earth for carbon stuff.
http://www.thehighwaymen.co.uk/acatalog/Single_line_kites.html
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Patrick Henry

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Re: Some expert advice, please...
« Reply #10 on: October 31, 2011, 02:01:05 AM »

Thanks for all the valuable help chaps, it's much appreciated.

I think carbon tube may be the way to go, I'm told to think lightness above the waterline, weight below.


Thanks again,



Rich
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Subculture

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Re: Some expert advice, please...
« Reply #11 on: October 31, 2011, 10:10:31 AM »

Carbon fibre will be less than a third of the weight of aluminium.

I would go for the giant cod 6mm stuff. The kite shop CR tubing looks like it is a thicker laminate- stronger but heavier.

Patrick Henry

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Re: Some expert advice, please...
« Reply #12 on: October 31, 2011, 10:20:19 AM »

All done...just bought the Giant Cod 6mm stuff, more than enough there for the cross pieces and maybe even the mast as well.


Thanks everybody,


Rich
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richald

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Re: Some expert advice, please...
« Reply #13 on: October 31, 2011, 10:34:37 AM »

Glad to help Rich,

Could you post some photies when you've finished ?
cos I've been thing about building a catamaran with
carbon fibre tubing to hold the hulls together

Richard
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Patrick Henry

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Re: Some expert advice, please...
« Reply #14 on: October 31, 2011, 11:20:03 AM »

No problem Rich...I'll take plenty of pics as I go along. It's only a cheapie of a kit, but I think with a few mods along the way we can do something with it. I chose it because it's only a small boat, it fits in my flat and my car nicely, and our local lake isn't really big enough for big boats.




Rich
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