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Offline john_hamilton

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carbon tubes
« on: April 05, 2010, 10:22:02 PM »
has anyone got any old rs800 masts lying around that i can use for mast stumps and rack tubes?
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Offline ross_burkin

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Re: carbon tubes
« Reply #1 on: April 06, 2010, 01:04:56 AM »
Make your own if you can.
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Offline neal_gibson

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Re: carbon tubes
« Reply #2 on: April 06, 2010, 10:45:39 AM »
Hardy advanced composites in alnwick ias a good bet, they have all sorts of offcuts.

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Offline Banshee Ambulance

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Re: carbon tubes
« Reply #3 on: April 06, 2010, 11:00:14 AM »
I have access to some RS600 masts at a good price. There are two and a half of them.
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Offline john_hamilton

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Re: carbon tubes
« Reply #4 on: April 06, 2010, 11:37:48 AM »
which type of rs 600 mast? angel or the other?
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Offline Banshee Ambulance

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Re: carbon tubes
« Reply #5 on: April 06, 2010, 05:45:22 PM »
2x Angel and 1/2x Superspar I think. I have PMed you with the price I have been given. I think it is best to make my own tubing for racks etc but I am still new to this, I am learning as I go along.  ;D
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Offline Phil Alderson

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Re: carbon tubes
« Reply #6 on: April 06, 2010, 06:54:09 PM »

For the longways tubes I think that masts are overkill, but are spot on for mast stumps. For the sticky out wings they should be OK

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Offline Banshee Ambulance

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Re: carbon tubes
« Reply #7 on: April 07, 2010, 12:13:40 PM »
What diameter should the stump be to take a c-tech heel plug?
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Offline john_hamilton

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Re: carbon tubes
« Reply #8 on: April 07, 2010, 12:58:26 PM »
rob, when are you ordering from c-tech?
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Offline phil_kirk

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Re: carbon tubes
« Reply #9 on: April 07, 2010, 01:24:35 PM »
As Phil A says RS mast sections 800 or 600 will be ovekill for longways rack tubes.  The Boom on Slippery was an RS 800 mast where as the boom on E-numbers ws made over Paul's mandrel. The Boom on Slippery is twice the weight of E-Numbe's boom. various layups were suggested in the thread on racks cook books.

The racks that Andy P supplied me were 3.4 kgs together and were 2.6m long each. Dimeter about 50mm.

If your racks were twice the weight your boat would be much closer to the 50KG minimum weight.

To get the optimum weight and the lowest cost either make your own or scavenge.

To get a pucker product and save sometime but paying 30% more i would buy tubes as I did. They are stock tubes so reasonably priced.
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Offline john_hamilton

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Re: carbon tubes
« Reply #10 on: April 07, 2010, 01:29:34 PM »
phil, how much did the tubes from andy p cost?
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Offline john_hamilton

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Re: carbon tubes
« Reply #11 on: April 07, 2010, 01:32:03 PM »
what kind of weight per square metre foam is recommended for bulkheads, 80grams?
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roland_trim

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Re: carbon tubes
« Reply #12 on: April 07, 2010, 02:02:27 PM »


John,
Everything that went into EJ is here. http://www.sailingsource.com/cherub/test/doku.php/tech/3206build
For some reason the hull/BH's had gone missing from the page!
R
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Offline Banshee Ambulance

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Re: carbon tubes
« Reply #13 on: April 07, 2010, 02:55:36 PM »
Quote from: john_hamilton on April 07, 2010, 12:58:26 PM
rob, when are you ordering from c-tech?

I think the boat will start life with a RS600 mast so I will only be buying spreaders from c-tech. Im going to hold off and wait and see if Ian C wants to get rid of his C-tech one. Happy to order spreaders when you are ready to save on shipping.
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Offline Phil Alderson

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Re: carbon tubes
« Reply #14 on: April 07, 2010, 03:18:24 PM »
A while ago I priced up making carbon tubes against buying stock tubes and there was very little in it.

For my first boat I made tubes from glass uni's and cloth on a drain pipe mandrel, they worked OK and would probably still be lighter than bits of mast. and still quite cost effective.

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