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Old 02 July 2009, 07:32   #11
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Originally Posted by willk View Post
I think you'll find it is the reverse.

Curious about the Club House, the town is at less than 500ft, is it well up the Pennines then?
i know their club house and where their boats are kept is up at at ,mountain ,Queeensbury , about 4 miles west outside Bradford city center.think it highest village in yorks as they look down into the city ,on a clear day you can see 3 uk national parks ,look over at Derbyshire ,yorkshire and out to humberside ,guy recons that they can get more volume in for a given pressure as the air is less dense up there ,might be an urban myth or joke .
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Old 02 July 2009, 07:49   #12
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I've had the pressure release valve go off in my Bow section.

the relavent point is that for some reason it didn't stop when the pressure was back down to what it should be, but let far more air out than that.
It required a lot of pumping in hot weather to get it back up.(Ooer missus)

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Old 02 July 2009, 08:30   #13
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I always carry a plastic stirrup pump in the console. It is dual action so even with my big boat it is very easy to chuck some extra air in.

Even though I have bright tubes and pressure relief vavles I let some air out manually yesterday - they were drum tight. As it's easier to burst a balloon when it's blown up to it's limit I suspect the same is true of tubes!!!
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Old 02 July 2009, 08:50   #14
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Quote:
Originally Posted by m chappelow View Post
i know their club house and where their boats are kept is up at at ,mountain ,Queeensbury , about 4 miles west outside Bradford city center.think it highest village in yorks as they look down into the city ,on a clear day you can see 3 uk national parks ,look over at Derbyshire ,yorkshire and out to humberside ,guy recons that they can get more volume in for a given pressure as the air is less dense up there ,might be an urban myth or joke .
Volume will be limited by the tubes - but as air is compresable, the variable become pressure ( either by heating or changing atmospheric pressure) - you can get differing pressure for the same volume - pressure changes as you go up / down .Up = less atmospheric pressure - so stuff inflated lower gets harder . If you inflate at altitude and come down pressure increases so stuff goes soft.

Thats why if you dive gases expand / come out of solution (you get harder - until you pop ) as you rise to the surface etc etc . Same as water boiling at lower temps at less pressure - the gas just 'appears' -hopefully not inside you , or at a rate you cant deal with !
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Old 02 July 2009, 10:31   #15
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Originally Posted by Blackroady View Post
Volume will be limited by the tubes - but as air is compresable, the variable become pressure ( either by heating or changing atmospheric pressure) - you can get differing pressure for the same volume - pressure changes as you go up / down .Up = less atmospheric pressure - so stuff inflated lower gets harder . If you inflate at altitude and come down pressure increases so stuff goes soft.

Thats why if you dive gases expand / come out of solution (you get harder - until you pop ) as you rise to the surface etc etc . Same as water boiling at lower temps at less pressure - the gas just 'appears' -hopefully not inside you , or at a rate you cant deal with !
He probely means then, that there really hard when setting off but when at sea level they go flat .hope they let some out then on the way back up ,lol
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Old 02 July 2009, 14:20   #16
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Hey guys,

Thanks for the info (lots of it!)
I can't see the change in altitude being an issue, its almost certainly the temperature as the tubes are fine until its been on the water for a while.

I'll wait for a hot day and blow them up as far as I dare at home and then see how they hold up!!

I think I might just be being too scaredy with how much air I put in them!
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Old 03 July 2009, 21:52   #17
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I have the same problem here - even in the summer the Antarctic currents mean the water temps are always low - about 5 deg a lot of the time I think. A rock hard tube on a sunny day goes quite limp in the water - often have to pump them up a bit. It isn't helped by the fact the tubes don't hold high pressure well - must be slightly porous I guess - if you get a hot day with strong sunshine and then a cold day the tubes will look quite soft and need pumping up before use. I can live with it - a pump always lives in the console and it takes about 20 pumps into each chamber which only takes a couple of minutes. The two rear chambers (Paul Tilley's sausages) hold air perfectly and have pressure relief valves so I leave them hard all the time.
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