All of my dives in Ft. Lauderdale have been drift deco.  All have been on
pure o2.  No freighter contacts to date.

I have done the Wilkes Barre fixed deco with eight guys on Jon lines, no
problem.

The 80% fad is over.  Time to move on.

Trout

----------
> From: George P. Wentland <wentland@ns*.ac*.no*.ed*>
> To: Jess Armantrout <armantrout@wo*.at*.ne*>; George P. Wentland
<wentland@ns*.ac*.no*.ed*>; Joel Silverstein
<joelsilverstein@wo*.at*.ne*>; gwaw@ix*.ne*.co*
> Cc: Techdiver@aquanaut.com
> Subject: RE: 80% arrrgh!! was Re: On the left
> Date: Monday, November 30, 1998 1:04 PM
> 
> After an insult Jess writes:
> OK, once more for the slow learners, and I will type slowly so as not to
> lose you.
> 
> In ruff seas, you are going to either be drifting or on an anchor line of
> some sort.  If drifting shoot a lift bag.  If on the anchor line, run a
jon
> line, then shoot a bag.  When the five foot wave comes, guess what?  You
> move up and down in the water column!!! Your PO2 is constant!!! Magic!!!
> Wow!!! Cool!!!
> 
> Richard writes:
> Would it be that hard to just do your deco a bit shallower if you have
> problem with high waves and worry about your changing po2? I guess I know
> the aswer, you are treating your self during your deco rather than
> decompressing.
> 
> In the dopler ultrasonic tests I have taken part in, oxygen clearly works
> better for me aswell as the deeper stops do. No bull, facts and no
personal
> preference made up by non active divers who does not expose them self.
> 
> Tim writes:
> Do I need to go back to school here???  Where did you get this idea???
> Where is "nsu.acast.nova.edu"???
> 
> The pressure under water is basically constant depending on depth.  I
don't
> think the waves and swells add to the pressure (ie: depth).  I just can't
> believe that any wave or swell would direct the effect of pressure change
> directly down on the diver.  If that were so, then, how come your
eardrums
> do not blow out or why doesn't everyone have an embolism when the "5 or
10"
> ft wave or swell passes overhead.  While the wave shape is not exactly
> sinusoidal it is somewhat symetrical going above and below the mean
surface
> average (crest & trough) and therefore promotes an average depth value
> regardless of wave size.
> 
> 	Okay, if we hook a line to the wreck and we come up to our 20' deco
stop.
> We switch to 100% O2, hook up a Jon line and send up a lift bag because
> waves don't have an effect on ppO2 during deco stops.
> 	I can see the tangle of reel lines as 3 or 4 divers are on the line at
> once. If you are anchored to the bottom and not drifting you are
maintaining
> a constant height off the bottom. If you are using a Jon line you are
still
> maintaining a constant height of the bottom, unless your depth is being
> controled by surge. If you do a drift deco here in Fort Lauderdale, you
are
> flirting with freighter traffic.
> 	Still the fact remains that 80% O2 does not have as severe of a PPO2
shift
> with slight depth changes as 100% O2. Thus 80% is the safer deco mix. 80%
> will require longer hang time than 100%, but why are we racing out of the
> water? I try to plan my dives < 1.55 ppO2. Maybe someone will tell me
that
> 1.6% ppO2 is safer. Maybe it is, if a shark is nibbling on your fins.
> 
> Good Diving by George!!!!
> 
> George P. Wentland
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