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Old 13 January 2008, 21:30   #1
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Topping up da toobs

Has anyone used a CO2 for topping up the tubes. I have a few paintbal gun cylinders that I can refill from a large tank at home. Any comments would be welcome. I know you cannot do it too fast without freezing.
Thanks
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Old 14 January 2008, 02:33   #2
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Often did it from dive bottle, just keep the jet about 3 inches from the valve then when the tube gets hard the pressure equalizes and valve lets no more in. The only thing about CO2 is the fact that it becomes a weak acid when disolved with any salt water that may be in the tubes, so may rot the tubes from the inside.
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Old 14 January 2008, 15:24   #3
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Originally Posted by keelhauled View Post
Often did it from dive bottle, just keep the jet about 3 inches from the valve then when the tube gets hard the pressure equalizes and valve lets no more in. The only thing about CO2 is the fact that it becomes a weak acid when disolved with any salt water that may be in the tubes, so may rot the tubes from the inside.
That is could to know, thanks. I assume there would no problems using nitrogen.
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Old 14 January 2008, 15:27   #4
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I don't see why not - afterall liferafts are filled with CO2 very quickly.
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Old 17 January 2008, 05:22   #5
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That is could to know, thanks. I assume there would no problems using nitrogen.
I seem to remember that nitrogen is preferred as it is less likely to leak (bigger molecules or something) and expands less in heat - might be wrong though! I think they might fill tyres with it as well for a similar reason?
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When a boat looks that good who needs tubes!!!
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Old 17 January 2008, 05:45   #6
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I seem to remember that nitrogen is preferred as it is less likely to leak (bigger molecules or something) and expands less in heat - might be wrong though! I think they might fill tyres with it as well for a similar reason?
Someone on Iboats.com forums suggested filling the tubes with nitrogen for exactly that reason-apparently it's common in the USA to fill tyres with it.

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I don't see why not - afterall liferafts are filled with CO2 very quickly
Not sure the comparison to liferafts really counts though-they aren't left inflated for years at a time. It's an interesting question though.
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Old 17 January 2008, 07:48   #7
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Someone on Iboats.com forums suggested filling the tubes with nitrogen for exactly that reason-apparently it's common in the USA to fill tyres with it.
Surely our tubes have 79% Nitrogen in them anyway?

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Old 17 January 2008, 11:55   #8
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Boom

Hows about hydrogen! The positive bouyancy must reduce fuel consumption! Maybe thats what they use in them french ribs?


Seriously though........what about helium? Anyone done any experiments? Very expensive though.
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Old 17 January 2008, 12:00   #9
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Helium costs about 1p per litre, now work out how many litres you would need to fill your tubes. The other problem is helium is a very light gas and would leak out past valve seals and through the material seams.

Oddly enough ordinary air seems to be quite a cost effective solution

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Old 17 January 2008, 12:06   #10
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Cheaper than I thought!

My question was really...... has anyone ever tried it?.
I'm sure some crazy naval architect has had access to the required seaming/valve technology and budget to give it a go.
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