Some people can't seem to remember to turn left when using the left turn
signal in their car.  Can you imagine the mayhem if they had to decide which
way a particular valve turns?

A key to survival is to have the behavior ingrained so that when under
stress it is done by rote.  Choices use up time.  Usually, in any underwater
event, time is the most critical factor.  Using it to turn a knob in error
can be deadly.

The emphasis has been on roll offs where you can go to your back up while
sorting things out, but what about a catastrophic gas leak at depth?  (Like
300 fsw with a blown HP hose.)  While you are pondering left or right the
gas is draining - and very rapidly I might add.

Standardization of component function is critical, especially for life
support equipment.  Given the PADI mentality of the dive industry, I could
foresee some manufacturers deciding that lefthanders should have knobs
designed for them.  Can you imagine the chaos then?  Lets see, if he's lefty
I turn it this way, if he's righty I turn the other way.  Uh oh, he's
ambidextrous....

jc



----- Original Message -----
From: Porter, Greg <Gregory.Porter@AR*.Bo*.co*>
To: <techdiver@aquanaut.com>; <FlTechDiver@mikey.net>
Sent: Thursday, June 21, 2001 1:29 PM
Subject: Left Post Knob - Reverse Thread ?


> The other night in a Scott Bonis decompression class he explained why the
> long hose is now moved to the right post - because it fixes the problem of
> my OOA buddy in front being the victim of my left post being shut down via
> rolling the knob along the ceiling - and the fact that rolling along the
> ceiling now shuts down the SPG instead.
>
> Given the machining abilities today's manufacturers possess, why do we
> continue to deal with this potential of the left post being shut down
during
> a roll along the ceiling ?
>
> > Why not build the manifold so that the left post knob is reverse
threaded
> > ?  This eliminates the rolling off problem and it may also simplify
> > shutting down either valve because divers would no longer have to
remember
> > righty-tighty and how to apply it to opposing posts.  Shutting down
either
> > cylinder would be done by rolling the top of the knob forward... either
> > knob.
> >
> Are there significant reasons preventing this change ?
>
> Cheers,
> Greg
>
>
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