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Old 18 January 2012, 10:06   #1
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Venting dry suit fact or myth.

If you don't vent your dry suit and you go overboard can you drown legs up, is this a fact or a myth ? I'm sure there was a video of this on youtube a few years back but I can't find it. As it happens!! I always vent mine after putting it on.
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Old 18 January 2012, 10:15   #2
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More air is in the "body" of the suit than in the legs, I'll leave you to work the rest out.
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Old 18 January 2012, 10:37   #3
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If you fall in head first the all the air will end up in your legs, if this happens you can curl into a ball and roll forward to try to get you head up again.
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Old 18 January 2012, 10:39   #4
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I did and a lifejacket (or possibly more likely in a dinghy - bouyany aid) kind of doesn't give it much room to stay there as it compresses the suit round your torso.

And when you enter the water, the air will naturally be pushed to the top....or your feet if you go in head first.......


Now, if you have a nice auto inflating lifejacket that may redress the balance, but I'd be venting mine - if nothing ese you don't spend the day doing Michelin man impressions!
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Old 18 January 2012, 10:40   #5
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Quote:
Originally Posted by chewy View Post
More air is in the "body" of the suit than in the legs, I'll leave you to work the rest out.
I would have thought that there would be more or if not the same amount of trapped air in the legs as in the body. My suit has elasticated waist and latex socks so including both legs from waist down it can hold quite a lot of air.
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Old 18 January 2012, 11:09   #6
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Doesn't matter where it is. Air in the suit is free to move to the less pressurized area, i.e. the last thing to dip underwater. Water pressure will shrink-wrap the submerged part of the suit to your body, and the bubble ends up at the surface. As has been said, if you are feet-up, curl up in a ball, right yourself by swinging your arms, the extend your legs. The bubble will move to the torso and neck of the suit and your equilibeium will be restored.

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Old 18 January 2012, 11:17   #7
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You won't naturally hang head down. The natural position even without any kind of life jacket will be flat, either face down or face up. Just because some gas was pushed out of your torso does not make your chest negative/sink. There's still a good amount of positive bouyancy up there with your lungs and residual gas in the suit. It may take some time to shift flat way naturally or you can just help it along by doing a "situp" which is the the same as this ball curling motion. Its not at all difficult or unnatural.
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Old 18 January 2012, 13:31   #8
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Quote:
Originally Posted by kerny View Post
If you don't vent your dry suit and you go overboard can you drown legs up, is this a fact or a myth ? I'm sure there was a video of this on youtube a few years back but I can't find it. As it happens!! I always vent mine after putting it on.
Nope not a myth. I was once dragged up from 45m to 20m by a diver who had lost his weight belt & inverted. I let him go at 20m or we would have both finished up in the chamber. He spent 3 days in hospital.
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Old 18 January 2012, 14:11   #9
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I got an Auto dump value fitted to my suit , just pug your dry suit on and go for a walk in water you will see your the effect at top...UHF suit gets clingy on the bottom half and puffy at top!

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Old 18 January 2012, 14:22   #10
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Nope not a myth. I was once dragged up from 45m to 20m by a diver who had lost his weight belt & inverted. I let him go at 20m or we would have both finished up in the chamber. He spent 3 days in hospital.
How is this related to falling overboard with 1ata gas in your suit? Many RIB and rafting oriented drysuits don't even have inflation/deflation valves.
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