Planning 'Deco-stops' on V-planner & PADI RDP - Questions?

[cod3r]

I've been running some profiles on my recently downloaded V-planner software and comparing them against the PADI RDP (air tables) (I'll run the profiles on my Aladin later).

It strikes me, that with a +2 conservatism, the V-planner prescibes deco stops for profiles that in the RDP would not even require a safety stop.

Now this is great, because it allows me to run "deco" profiles without actually going into deco without training.

However it does seem bizarre. Am I doing something daft?

Any responses would be appreciated.


cod3r

[Garf]

dunno, but i used to do the same.

I've been deco diving ever since ooh about my third week of diving when I realised that putting a longer safety stop into a dive made me feel more refreshed. Ever since then I've trusted V planner to get me out of the water safely and feeling good. The moment the VR3 can be updated to VPMB I'll be sending mine off.

That being said, I'd still compare them to the PADI slate for the time being. Otherwise you are in danger of slipping into dives that do require mandatory deco, by anyone's measure, without the training, and that is not advisable.

[Mark Chase]

Shock horror its true

Believe it or not the PADI dive planner is pretty aggressive deco or should I say no decompression limits. That 18m/min ascent rate sends a shudder down my spine as well. Because its OW level we assume is all safe and woolly soft stuff but its not.

Most people don’t realise this, as they never use the dammed thing, they just use a computer

When you get into deeper stuff there’s BSAC88 tables and Buhlmann Tables and they’re pretty scary too. Not suitable for this buggered bodied old git I can tell you.

ATB

Mark Chase

[Garf]

[shudder] God, I'd forgotten about PADI's 18M/min ascent rate, [/shudder]

[wreckweasel]

Originally Posted by cod3r

It strikes me, that with a +2 conservatism, the V-planner prescibes deco stops for profiles that in the RDP would not even require a safety stop.

Now this is great, because it allows me to run "deco" profiles without actually going into deco without training.

However it does seem bizarre. Am I doing something daft?

One is a gas phase based model, the other is a bubble model.

At the end of the day, how you get there doesnt matter (the maths), its all about the outcome.

Still... 18m/min.... eep!

Its amazing how much diving has been conducted worldwide on this "unsafe" model

Should you be worried... nah.... but it should stimulate you to read some more! (always a good thing)

[dry suit diver]

Originally Posted by wreckweasel

One is a gas phase based model, the other is a bubble model.

At the end of the day, how you get there doesnt matter (the maths), its all about the outcome.

Still... 18m/min.... eep!

Its amazing how much diving has been conducted worldwide on this "unsafe" model

Should you be worried... nah.... but it should stimulate you to read some more! (always a good thing)

don't think i have ever ascended at 18m/min as my aladin wont let me and even when training we were issued with aladins.maximum ascent rate i ever got was 110% even when i did my upside down polaris on dry suit specialty,all of the downloaded profiles work out at about 10m/min.

even i as an inexperienced diver think 18m/min is a bit fast.

[cod3r]

Cheers. I always thought that at 30m (almost half my dives) I'm treading the thin edge of recreational diving anyway, and I'd rather be safe by doing a small deco profile (within the no-stop limits of my aladin).

cod3r

[rossh]

Originally Posted by cod3r

I've been running some profiles on my recently downloaded V-planner software and comparing them against the PADI RDP (air tables) (I'll run the profiles on my Aladin later).
It strikes me, that with a +2 conservatism, the V-planner prescibes deco stops for profiles that in the RDP would not even require a safety stop.
Now this is great, because it allows me to run "deco" profiles without actually going into deco without training.
However it does seem bizarre. Am I doing something daft?
Any responses would be appreciated.
cod3r

Mr Cod,

The base line is Nominal. Set the Conservatism to Nominal VPM-B and you will get your NDL's just about perfectly.

Regards