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> At 11:43 PM 1/29/96, Ronnie Bell wrote:
> 
> > I bought a Poseiden Uni-Suit, but then again I dive in cold water.
> > Coldest cave dive was 42 degrees at 300 for 45 minutes. Imagine what a
> > flooded shell suit would be like. eech.
> > Although some will rail about the Neoprene compressing I find it hard to
> > believe that the shell suit underwear doesn't compress. I seem to recall
> > that most insulative processes rely on trapping air. Air compresses
> > whether it's captured between the fibers of underwear or trapped as
> > bubbles in a neoprene suit. Oh yes the neoprene suits are a bit cheaper!
> >
> > replys welcome
> 
> 
> the difference is that you can, and do, ADD air (or argon) into the suit to
> offset the compression of air in the underwear...
> you can NOT add air into the bubbles in the actual neoprene..so whatever
> insulation is lost there remains lost
> 
> the big difference is the CHANGE in buoyancy and insulation of the neoprene
> suit is far greater
> 
> w2
> 
> 	You counteract the change of the suit buoyancy by adding extra
air to the suit - the neoprene compresses out, as it were, not in. You
wind up with a suit with excess air in, which wanders around outside the
underwear and can cause problems. Eventually, there's too much air for
the neck seal to support, and you fart it all out. At this point you are
forced into a non-ideal situaution - running two BCs at depth.

	Generally encountered (if at all) in the range 35-45m.

	So, deeper divers tend towards membrane. Wreckies tend towards
neoprene (somewhat more resistant). Deep wreckies like compressed
neoprene.

	Oddly, a lot of divers shift from neoprene to membrane, but few
shift the other way...

	JMHP

	Jason

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