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At 01:21 19.02.98 -0700, you wrote:
>>Subject: RE: dacor 1998 buyer's guide
>>Sent: 2/18/98 11:18 PM
>>Received: 2/19/98 1:15 AM
>>From: Calkins, Rob, RCalkins@Wo*.co*
>>To: 'Jon Breazile', breazile@ne*.co*
>>CC: captjt@mi*.co*
>> Techdiver, techdiver@aquanaut.com
>>
>>Sorry guys, this manifold is not new, dacor has been selling it for
>>many years. why? who knows. I guess it is like the
>>rest of there gear. No one wants it.
>>
>>Rob Calkins
>
>
>I don't want the one I've had for the past 20+ years, I did dive it in
>the late 70's, though. I wouldn't take one very deep (like 30 to 40 ft.)
>even back then.
>
>Later,
>
>Mike
>Oregon, USA
>
>mike.wells@cm*.co*
The double yoke manifold used to be state-of-the-art. It's a quick way to
combine two single 70s or 80s, but you get one regulator only. Until
recently, a single reg was all you would see sport divers using, and, to be
fair, it's still very common. (I don't really consider the optional octopus
a second reg).
I remember when doubles came with two ports in the eighties. Most people
used only one reg anyway and the second port was just there to collect salt
deposits.
Dacor's two tank adaptor may be OK for shallow sport dives with no overhead
concerns. It's definitely not a tech solution. However, until rank and file
sport divers start using two separate regs there's little point to selling
two port doubles. The adaptor reflects yesterday's thinking that's still
very much alive. Valve shut-down is a totally foreign term in basic sport
diving.
A double threaded connector (DIN) would be safer, but since most US tanks
are single 80s with yoke connector this is what you get.
How about two ports? Well, unless you go separate valves you'd get a rig
where it would be impossible to shut down a malfunctioning reg. You'd get
two paralell regs that would both have to seat properly. Blow one O-ring and
you lose them both! Conversely, if you go a connector with separate valves
you'll get an interesting assortment of knobs, the yokes connecting tanks
included.
Needless to say, a two port connector with all the works is our choice.
However, can anybody think of a design that's simple enough for sport
diving, yet incorporating the features we want?
In Europe a Y-valves on a single 90 is pretty common among slightly advanced
sport divers. The Y-valve gives you two independent ports (and shut-down
capability) so you may fit two independent regs on one cylinder. I think
this is a better solution for the divers it's meant to cater to. If you
really need to dive doubles, for anything but 2 hours at 40', you'd want a
second regulator. The Y-valve tells you that redundancy comes before a
humongous air supply while the connector suggests that doubles come before a
redundant air supply.
regards
Hans
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