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Date: Fri, 30 Apr 1999 13:58:13 +0200
To: "John Grogan" <john@ro*.co*.uk*>
From: Peter Fjelsten <fjelsten@ma*.st*.dk*>
Subject: Re: Auto inflate smbs
Cc: <techdiver@aquanaut.com>
John Grogan sendte noget til mig den 11:59 30-04-99  som indeholdt pr=E6cis=
 .=20
.. .
The week link in the chain is the diver and it relies too much on the diver
to remember to do a number of things.  All it takes is to forget 1 thing=20
and it's useless.  You then have to resort to your backup D-SMB which most
likely is one you fill from your reg, so why not cut out the first
problematic stage.  Again, rather than create more problems in order to
solve one, just avoid the original problem in the first place.

- As I said, my primary reason for using the integrated type is to prevent=
=20
freezing. I am completely aware of the 'patching of other problems' issue,=
=20
but I use the cylinder type to prevent a real problem from happening (reg.=
=20
freezing). I'm not saying that this is the _only_ way to do it and I have=20
contempleted going back to the original type buoy but the freezing issue=20
troubles me somewhat. How cold do the UK waters get? To the best of my=20
knowledge you are constantly 5-10 degrees over us?

- "The week (sic) link in the chain is the diver": One can forget many=20
things. If one can forget to fill the buoy cylinder it should -=20
theoretically - be just as easy to forget filling your deco cylinders? I=20
know that this is ridiculous but do you see my point? And only thing must=20
be remembered: to fill the cylinder. The diver must remember to do a lot of=
=20
things before he/she is ready: get the equiment ready, cut tables, fill=20
cylinders, etc.

Again, another thing to bring with you.  Another weak link in the chain and
this doesn't solve the occasions when you forget to fill the bottle.

- If I can/must remember 100s of other things: the O2 analyser, analysing=20
my gas, my fins (not 'analysing my fins' :-), etc., ONE extra thing=20
probably won't make the whole system collapse. Some people have to remember=
=20
to bring a lot more stuff than I, so I think it's within my mental=20
capability to remember this.

So had mine but the effort of jumping from the back of the boat into the
water undid the velcro on about 70% of dives.  I always got to the bottom
only to discover it had un-done.

- Mine has never come undone in my 2 years of use.

I suspect that in entering the wreck, the valve somehow got partly turned=20
on and it slowly filled the bag.  If your bottle has a valve, then it can
happen to you too.  Just because it hasn't happened yet doesn't mean it
won't ever happen.

- I think that there is a difference between buoys and how you carry them.=
=20
I suppose you used the ADP? How did you carry it?

Since I ditched mine, I became more observent of others using them and I've
found that those people tend to use them because they cannot properly use a
D-SMB without a bottle.  In other words, they cannot send up a bag without
losing their buoyancy, or without free-flowing their regs or without
tangling up the line or screwing up in some other manner.  It's often a=20
poor substitute for skills.

- I used a regular DSMB for some time before getting this type. Yes, I can=
=20
do it with a regular type so I - alas (?) - do not fit in your "lack of=20
skill so get a cylinder DSMB" group.

- As I stated above, I am not totally opposing the non-cylinder type and=20
sometimes wonder whether I should switch back, so I am _not_ claiming _my_=
=20
way necessarily is the best/only way. Convince me!

Hilsen (Rgds.),
=09
Peter Fjelsten
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