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Sorry, Bob, yes these are rationalizations but not one single reason that a
single with H is better than a set of doubles.

You can't do it, get over it.

If you think you need an H valve than what you really need are doubles. If
you don't think you need doubles than you don't need an H valve.

   Jim
 -------------------------------------------------------------------
 Learn About Trimix at http://www.cisatlantic.com/trimix/

> From: RDecker388@ao*.co*
> Date: Sun, 8 Jul 2001 22:25:59 EDT
> To: cobber@ci*.co*
> Cc: techdiver@aquanaut.com
> Subject: Re: Y - valve
> 
> In a message dated 7/8/01 9:35:20 PM Eastern Daylight Time,
> cobber@ci*.co* writes:
> 
>> I used an H valve and it took me about 4 or 5 dives for the lightbulb to
>> come on and realize that it was stupid and pointless.
> 
> Funny how the filiment tends to burn out just as the light comes on, eh?
> 
>> The ball is now in
>> your court, you need to come up with a reason, a rationale of why anyone
>> would use a single tank over iso doubles for overhead diving and why it's
>> better than doubles.
> 
> I've provided you with plenty of rationale, however before rehashing those, a
> simple consideration - Unless you dive solo, you have a readily available
> redundant gas source at hand at all times.  Following proper gas management
> and team diving techniques a gas supply problem should not be a major issue.
> Deal with it and move on.  Equipment failures are extermely rare.  For
> "weenie dives" there's no reason to go overboard by backing up things that do
> not need to be backed up.  Most of us gave up the "everything but the kitchen
> sink" for every dive approach quite some time ago.
> 
> Rationales:
> 
> 1) It provides more redundancy that a single outlet valve.
> 
> 2) It allows the use of the same regulator system whether diving doubles or a
> single.
> 
> 3) While a single doesn't look as macho as a set of doubles, nor stroke one's
> ego as well, there are dives where that's all the gas that is needed.
> 
> 4) It has a proven track record for limited penetration dives in recreational
> depths.
> 
> 5) It adequately backs up minor leaks and free-flows.  Catastrophic gas
> losses are extremely rare.
> 
> 6) It's much more streamlined and sensible than a pony bottle.
> 
> 7)   If a diver needs a pair of doubles to do a little 60/70 foot dive
> something's very, very wrong.  Get a pair of Nikes and a speedo, wipe the
> pizza stains off your drysuit and work on that RMV problem.
> 
> 8) For recreational divers, it's a reasonable tranisitional move in the
> direction of DIR.
> 
> 9) "Two is one, one is none," wanna make a guess how many limited penetration
> dives and swim thrus are made in a year using a single with a standard K
> valve?  Or the number of wreck divers pushing their handy, dandy little dive
> computers into "just a little deco?"  It should be obvious that a dual outlet
> valve is an improvement for those divers.
> 
> 10) If you have a death wish, dive solo.... practice progressive
> penetration... ignore gas management procedures..... break the dive plan....
> with or without doubles.  If you want to live, use the right tools for the
> job, which always includes a partner and may include either a single or
> doubles depending upon the mission.
> 
> 
> BTW, what annoys me is all the newbies being led to think that all they have
> to do in order to do the "big dives" is strap on a set of twins with and iso
> manifold.  What annoys me is watching these same newbies pushing well beyond
> their training and experience becuase they have an "unlimited" gas supply on
> thier backs.  What also bothers me is all these newbies coming to the
> conclusion that since they have this "fail-safe" redundant gas system on
> their backs they don't need a buddy anymore.
> 
> Dive doubles and you can deal with anything = BS
> 
> Dive a single with an H/Y responsibly and you'll die = BS
> 
> Our opinions differ substantially on this subject.  Get over it.  Life goes
> on.
> 
> Bob D.
> www.SportDiverHQ.com
> 
> 
> 


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