Quote:
| Originally Posted by [b Quote[/b] (Bob Cooper @ Aug. 28 2003,20:28)] |
Quote:
| Originally Posted by [b Quote[/b] ]Haven't had time to read it through in detail but I would chip in that 65m for 30 min is not really viable. You don't have enough back gas (unless you both have a set of twin 18's perhaps). With twin 15's it's too marginal. And with twin 12's it's a no-no. |
Why?
I did two 65m dives on twin 12s with 40min bottom times. Top of the wreck on the Illonys was admitidly 59m but my print out showed an average depth of about 61. My second dive had an average depth of 63m.
On the first dive I came up out of the water with about 90 bar and on the second about 80bar on twin 12s blown to 260 admitidly but probably at about 250 by the time we were in the water.
30mins would be a doddle
If you are talking rule of thirds yes it cant be done but rule of thirds is cave diving stuff and shouldent be transposed to deep diving.
Quote:
| Originally Posted by [b Quote[/b] ]Also, the run time is a bit more than I'd be comfortable with in UK conditions. Without regurgitating all the details, I'd probably cut the bottom time to 25 mins, do the deep stops and end up with 3 at 12, 7 at 9 and about 15 at 6 (a RT of about 100 mins). Gasses would be 15/55, 50% and 100%
Cutting the BT to 25 mins would keep everybody happy according to the deco progs. |
We were doing 120 -140min profiles in 16c water in chopy conditions day one and calm on day two. I wouldent atempt this in the winter but I dont see a problem in the summer.
Quote:
| Originally Posted by [b Quote[/b] ]Jez and Michael would freely admit that their problem last year was caused by not following this advice. |
I would be realy interested to here what you think of their dive profile. I just couldent get it to work on Decoplanner. I apreciate from their comments about 'getting used to two stages' that they were novice divers and I will withhold any scathing comments about doing such depths at their level of experaince as I have done some silly things my self but I was amazed at their choice of 50% for deco.
I know I am bashing my head against a brick wall but is there a small inkling of a possabuility that you could admit that if they had a VR3 straped to their wrist screeming a warning at them they could have realised they screwed up the manual tables and avoided the bend?
I am honistly not singling this out as a DIR thing I am just noteing an event (as I have in the past with non DIR divers) where manual tables (it was a computer last time) failed miserably and where dispite missing a shead load of stops the divers still hold to the mistery bend theory convinved their profile was safe.
If you can make the profiles work on Decoplanner let me know the settings because I cant.
Mark Chase