Hi Larry,

I dont know if we met at Badgat on the weekend, but I am glad that somebody
is putting forward your guys view.  I am interested to see the responses.

The claim that the helium penetrates suit came from the current owner who
said that his suit doesn't suffer the wild swings in buoyancy and insulation
characteristics that everybody else's does because he inflates it with
helium and the helium penetrates the neoprene and keeps it at the original
thickness.

It is a pity that you guys are so proud of being strokes that you dont
seriously think about the fundamental configuration problems that you have.
Most importantly, twin independents with twin short hoses in the cave.
Maybe you would like to take this opportunity to tell the list why you guys
dont believe in manifolds or long hoses for cave diving.

Cheers,

Simon Murray

----- Original Message -----
From: Larry Holding <larryh@an*.co*.za*>
To: Techdiver List <techdiver@aquanaut.com>
Sent: Wednesday, March 22, 2000 10:20 AM
Subject: Re: Helium penetrates neoprene ???


> >In a message dated 3/15/00 2:13:40 AM Central Standard Time,
> >simonm@ho*.co*.za* writes:
> >
> ><< I had a conversation with a long term hardened stroke over the
weekend
> and
> >he told me that his non-crushed neoprene dry suit does not change its
> >buoyancy characteristics as he goes deeper because the helium that he
uses
> to
> >inflate it penetrates the neoprene and stops it from crushing. >>
> >
> >Are You sure that he wasn't just pulling your leg.  He couldn't be
serious.
> The genesis of the conversation was the evidence that the non-crushed
> neoprene dry suit provided.
>
> The dry suit in question had been used to extreme depth by it's previous
> owner. As a result of this exposure the wrist seals which were previously
> non-crushed neoprene are now crushed neoprene seals. The neck seal which
had
> been exposed to the Trimix used to inflate the dry suit was not
permanently
> crushed. The theory put forward was that some helium was able to enter the
> cavities in the neoprene of the neck seal and upon ascent, when the
pressure
> was reduced, helped the material to rebound.
>
> A similar (i.e. He also involved) event has been observed previously with
an
> environmentaly sealed first stage. After being used as a stage bottle DV
on
> a Trimix tank, it had quite a large buble of gas in the sealant fluid
> (glycol?). The bubble went down after a few days. This had not been
observed
> before or since when using the DV with air.
>
> Larry.
>
> P.S. I am not the stroke in question, but do dive with him regularly
(which
> makes me a stroke too).
> -------------------------------------------------------------------
> 15 million lemmings can't be wrong.
>
>
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