Proplanner Vs Navy air tabels :(

[Pierre Farrugia]

Hello all,

Just came from a hot argument with an other diver. The subject was proplanner( 10% safety 10microbubble formation) cut deco tabels as opposed to his navy air tabels! We were comparing same dive which we both did, so him 60m 25min on air and me 60m 25min bottom time on air and deco on 60%. I ended up doing more deco than him :o

Here are the 2 profiles

Mine

Depth1= 60msw: 25mins 21%O2 Run Time= 25mins

DIVE 1 DECOMPRESSION REQUIREMENTS
Stop= 38msw: 1mins 21%O2 Run Time= 28mins
Stop= 27msw: 1mins 21%O2 Run Time= 30mins
Stop= 18msw: 1mins 21%O2 Run Time= 32mins
Stop= 15msw: 2mins 60%O2 Run Time= 35mins
Stop= 12msw: 4mins 60%O2 Run Time= 39mins
Stop= 9msw: 6mins 60%O2 Run Time= 45mins
Stop= 6msw: 32mins 60%O2 Run Time= 77mins

Us Navy

60m 25min air

deco 7min @ 9m air
14min @ 6m air
25min @ 3m air
with a runtime of 77min

What you think about the above profiles, it's true that he is not getting bend but is he risking so much or I am doing too much deco?

[Drmike]

Navy tables are fast, too fast IMO. They are designed for very fit young Navy boys with all the backup safety equipment (chambers) etc on hand.

Personally I am neither terribly fit or terribly young so I shy away from less conservative tables and use models which get me out of the water feeling great as appose to feeling sleepy and fatigued as I used to on these tables.

Better to do too much deco than too less. IMO better deco doesn't necessarily mean faster out the water, it means also 'cleaner' out the water.

[Pierre Farrugia]

I am not too bothered about staying more in the water and prefer to do better deco as only me will benefit at the end. To tell you the truth sometime we even do 10 to 15min more at 6 m as we prefer to stay under water at 26'c than on the rib while waiting for others to come up. But what strikes me is the big differtence. I even checked the profile on deco planner with 100/100 air only and was not even close, with a run time of 96 min as opposed to his 77min rt! Thats 19min less :o But on the other end, comparing my profile to this profile and considering I am using accelerated deco and he only air the difference is too big! At the end if I just comapre the same dive 60m 25min on air only as he does, using deco planner 20/80 runtime is 163min
that's 86min less :o

Regards

Pierre Farrugia

[chrisch]

Here's what V Planner gives you. About time you guys got some better gasses over there Pierre....

V-Planner 3.40 by R. Hemingway, VPM code by Erik C. Baker.

Decompression model: VPM-B

DIVE PLAN
Surface interval = 5 day 0 hr 0 min.
Elevation = 0m
Conservatism = + 1

Dec to 60m (6:00) on Air, 10m/min descent.
Level 60m 19:00 (25:00) on Air, 1.46 ppO2, 60m ead
Asc to 36m (27) on Air, -9m/min ascent.
Stop at 36m 0:20 (28) on Air, 0.96 ppO2, 36m ead
Stop at 33m 1:00 (29) on Air, 0.90 ppO2, 33m ead
Stop at 30m 2:00 (31) on Air, 0.84 ppO2, 30m ead
Stop at 27m 2:00 (33) on Air, 0.77 ppO2, 27m ead
Stop at 24m 3:00 (36) on Air, 0.71 ppO2, 24m ead
Stop at 21m 3:00 (39) on Air, 0.65 ppO2, 21m ead
Stop at 18m 5:00 (44) on Air, 0.59 ppO2, 18m ead
Stop at 15m 5:00 (49) on Air, 0.52 ppO2, 15m ead
Stop at 12m 8:00 (57) on Air, 0.46 ppO2, 12m ead
Stop at 9m 12:00 (69) on Air, 0.40 ppO2, 9m ead
Stop at 6m 17:00 (86) on Air, 0.34 ppO2, 6m ead
Stop at 3m 31:00 (117) on Air, 0.27 ppO2, 3m ead
Asc to sfc. (117) on Air, -9m/min ascent.

Off gassing starts at 42.8m

OTU's this dive: 50
CNS Total: 21.1%

Best

Chris

[Pierre Farrugia]

About time you guys got some better gasses over there Pierre....

What do you mean? Here you can get what ever mix you choose to use.

Regards

Pierre Farrugia

[chrisch]

This looks a bit better then.

V-Planner 3.40 by R. Hemingway, VPM code by Erik C. Baker.

Decompression model: VPM-B

DIVE PLAN
Surface interval = 5 day 0 hr 0 min.
Elevation = 0m
Conservatism = + 1

Dec to 60m (6) on Trimix 21.0/36.0, 10m/min descent.
Level 60m 19:00 (25) on Trimix 21.0/36.0, 1.46 ppO2, 28m ead, 35m end
Asc to 36m (27) on Trimix 21.0/36.0, -9m/min ascent.
Stop at 36m 0:20 (28) on Trimix 21.0/36.0, 0.96 ppO2, 15m ead, 19m end
Stop at 33m 1:00 (29) on Trimix 21.0/36.0, 0.90 ppO2, 13m ead, 17m end
Stop at 30m 1:00 (30) on Trimix 21.0/36.0, 0.84 ppO2, 12m ead, 16m end
Stop at 27m 1:00 (31) on Trimix 21.0/36.0, 0.77 ppO2, 10m ead, 14m end
Stop at 24m 1:00 (32) on Trimix 21.0/36.0, 0.71 ppO2, 8m ead, 12m end
Stop at 21m 2:00 (34) on Nitrox 50.0, 1.54 ppO2, 10m ead
Stop at 18m 2:00 (36) on Nitrox 50.0, 1.39 ppO2, 8m ead
Stop at 15m 2:00 (38) on Nitrox 50.0, 1.24 ppO2, 6m ead
Stop at 12m 3:00 (41) on Nitrox 50.0, 1.10 ppO2, 4m ead
Stop at 9m 5:00 (46) on Nitrox 50.0, 0.95 ppO2, 2m ead
Stop at 6m 6:00 (52) on Oxygen, 1.60 ppO2, 0m ead
Stop at 3m 9:00 (61) on Oxygen, 1.30 ppO2, 0m ead
Asc to sfc. (61) on Oxygen, -9m/min ascent.

Off gassing starts at 42.7m

OTU's this dive: 87
CNS Total: 41.0%


What's the weather like down there? Starting to grey up and get autumnal here.

Chris

[Pierre Farrugia]

Hello,

Below I have attached part of this tabels. The stops depth which are not listed are 12m, 9m, 6m and 3m ! Also first coulum is depth and next to it is bottom time.

NB. Obvioulsy using this part of tabel at you own risk, and I would certainly do not use it, as consider way too much agressive!

[Pierre Farrugia]

What's the weather like down there? Starting to grey up and get autumnal here

Same

Pierre

[Pierre Farrugia]

Hello again,

Can you please compare your profiles to this. Also I was telling this guy that these tabels were designed to very fit young divers with a chamber standby. He told me that many divers use the US Navy tabels and he also told me that most probably the software programmer guy must have made some kind of mistake ?? Must tell Mr Gurr about this! How can I back my schedules as opposed to Us Navy tabels or just wait until this guy gets bend?

Regards

Pierre

[chrisch]

There's not a lot to go on, but what there is, this guy sounds a bit of a twat. Pierre - looks like you have to wait my friend!

That said the USN tables are for one dive per day. If this is all you are doing and the guy has a low susceptability to DCI you might have a long wait. Most recreational divers don't use USN and most often practice repetative diving.

I think you are correct and he is wrong.

Chris