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Old 23 November 2005, 07:09   #31
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Oh, sorry. I thought you said they are flat baffles and therefore could only displace a few litres. My mistake.
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Old 23 November 2005, 07:19   #32
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Quote:
Originally Posted by roycruse
There not actually cones though are they ? They are flat baffles - which means the additional volume available will only be the amount that that baffle can deform - which i would imagine would only allow or a few litres - or in other words a very small percentage of the total volume of a chamber.

I dont know for sure - but my guess would be that this would not supply sufficient protection.
The ones in our Avon were defiantly cones; well after it went bang they were more like funnels.
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Old 23 November 2005, 07:30   #33
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Quote:
Originally Posted by jwalker
Oh, sorry. I thought you said they are flat baffles and therefore could only displace a few litres. My mistake.
Ahh - i did say that - One of the disadvantages of talking in text - intonation is lost...

Ill try to clarify what i meant to say.

I am of the opinion that in my boat the baffles are flat - for no other reason than how they behave when i lower the pressure in one chamber. But I could be wrong - hence i said "are they" and put a question mark on the end.

I then went on to say - that being flat I thought they would not offer sufficient cross chamber protection for the purposes of pressure relief.

If however they are cones - i would still question their ability to sufficiently depressurise the adjacent chamber in an over pressure situation.

I was not trying to pick a fight - just trying to learn something by throwing in some comments.
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Old 23 November 2005, 07:34   #34
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Quote:
Originally Posted by roycruse
Ahh - i did say that ...

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Old 23 November 2005, 08:36   #35
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Quote:
Originally Posted by Nate
he reckoned that they're not worth fitting in our climate, and could even be less than useful inasmuch as they'd release pressure on a hot day, but if left unattended, the boat would end up being underpressured when the temperature dropped.
He wants to selltubes though . They do work and once this year mine let out some air.....it was the day we had 29d. I doubt that they would let enough out to make the boat underpressured, as you would have topped them up by that time
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Old 23 November 2005, 08:50   #36
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Quote:
Originally Posted by Tim M
I used to have a quicksilver SIB. You had to seriosuly inflate that if you followed the instructions. From memory the tubes were about 2.5 and the floor was even more, possibly 4. Codders can correct me as he has this boat.
Yes quite right.

As to pumping up the tubes in sequence I am very carefull not to put too much air into any one chamber before getting them all pretty much even - then just top them up to final pressure.

I like the comment about sticking a pin in a balloon - obviously the higher the pressure the more likely it is to burst suddenly.

Someone made a valid point about the tubes flapping around etc if not inflated enough which could cause damage. I would say the opposite is true. If the tubes are so hard they don't deform a little then surely MORE stress will be applied to the bonded fixing???
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Old 23 November 2005, 18:54   #37
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THe quicksilver is heat welded together and I dont think is very prone to coming apart; I burst the bow on mine and the back stayed infalted. I think the baffles in the bow face the stern so in theory if the seams had been weak the hole boat would have blown.
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Old 23 November 2005, 19:49   #38
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on fitting pressure release valves i think it may depend on the tube colour to an extent, ie black tubes will draw more heat than white tubes so fitting the valves on darker tubes is what the tubing guys seem to advise, also on quicksilver the main tubes are 2.5 or so (cant remember exactly as it is on the pump gauge) but the floor is nearer 10 on the airdeck model i have
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Old 24 November 2005, 05:18   #39
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we have pressure relief valves in all our boats-black boats and yellow ones. Wouldnt be without 'em. I can run the tubes nice and hard without worry and I can leave them without watching for the sun all the time. Many years ago a certain lifeboat station left a pumped up "D" class out in the sun while they rattled the collecting tin-and split it !
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