Deco options.

[turbanator]

Originally Posted by Rob Evans

Ahem.. I was being facetious - given the outfit who are responsible for decoplanner it's not entirely surprising there's no CC support. NOT that it's not a good app of course.

No Probs, I guessed you were, and you're right. There was only 1 RB to have and that's the RB80 (well the 'fridge' was also about at the time) when it was written.

r
Paul

[Rob Evans]

Hi Pierre,
ddPlan as you stated can be a touch unfriendly given the interface, but does give you lots of options for 'just deeper/longer' printed tables as per Paul's requirements (very handy). Once you get round the front end, it's a very flexible app. Have a read of Gordon's instructions at Drogon.net to get the best out of it.

V-Planner does good OC bailout options too, though I can't remember offhand if it does the deeper/longer (or for that matter shallower/shorter) bit. I think it does. Considering that I've got it sat on the same laptop as I'm typing on right now, it's pretty bleeding lazy of me not to check it out, don't you agree? Well yah boo sucks to the lot of you, I'm off to the pub!

Night all

[KISSer]

Turbanator

As you alluded earlier in this thread, maintaining a fixed setpoint on the KISS on ascent is probably more bother than its worth. It is easier on a VPM/RGBM ascent than a GF ascent, simply because the stops start deeper and (if you set the options in the s/w) you get a minute every 3m to tweak your setpoint. BUT if you were involved early in the testing of Decoplan then I guess you've followed a lot of the WKPP stuff about constant PO2 deco not being as effective as the models say, though obviously you have to take that along with the anti-CCR stance of WKPP.

V-plan has (or had when i last looked) a semi-closed ascent option which mimics the dropping PO2, but you can define set-points along the way.

I'd suggest you first work out how you want to approach deco (constant PO2 or not, how you want to cycle your PO2, whether you'll be diving with OC or CC buddies) and go from there. Effectively you're back to the early days of decoplan, playing with GFs and table fudging to see how you feel.

[wreckweasel]

Constant PO2 Ascent has three issues as KISSer said (who is KISSer anyway!? );

1. There is a school of thought that says its not efficient deco
2. Its a bugger pressing that button on manual units
3. Its wasteful of O2


I must admit I tend to sit somewhere in the middle of all this. My tables are cut for 1.2 bottom and 1.4 from 9m. They don't differ hugely from an OC bailout with a suitable number of gases.

In practise (get ready to tell me Im mad), I tend to run around 1.25/1.3 (depends on duration of total dive sequence), then boost to 1.4 to commence ascent, letting it tail off and then boosting again when it drops to 1.1ish.

Oh yes and Im one of those fools who does full O2 flushes at 6m... although its virtually impossible to get the loop much above 1.55, so 1.5 does for me.

The only bit Im really struggling with in my head is gas toggling. I used to feel the value in OC days, so logic says I should do it on CC. Sadly, its a right arse to do CC (loop becomes very gas inefficient) and doing it on OC means carrying gas I plan to use, pissing around with bouyancy and managing my loop.

Like someone once said, you never stop learning!

[PeteM]

Originally Posted by zaksherlock

The only bit Im really struggling with in my head is gas toggling.

What do you mean by gas toggling? I've never heard the term before.

[Drmike]

Originally Posted by turbanator

Money may well be stopping me from getting a VR3, but also the fact that I like to know how things work manually before I trust a computer .

So would any of the RB guys like to say how they manually do deco, or plan to do deco if :-

a) Their VR3 failed
b) They have a KISS or would be flying their Inspos manually.

r
Paul

In my experience that should read WHEN the VR3 fails

When my Vr3 fails its no biggy as its my back up. My primary deco plan is on my slate and I have alternative back up plans in wetnotes.

I do a full O2 flush at 6m (a few times) to open up the oxygen window and check the sensors. I find this is a good way to track both sensor life and to give warning of me screwing up the calibration (in which case I would sit there for longer to try to make up for doing the wrong deco. )

If full electronic failure on the YBOD (MK15 has battery free back up gauge) I go OC all the way - cos I nearly always have enough OC gas for full bail deco and carry the deco plans for that. (or can use the VR3 to provide)

If space aliens have stolen my OC gas I would have no choice but to do a full dil flush at each stop and fly the unit min loop volume injecting O2 as needed. Taking care when ascending as the PO2 will be dropping. This is when the VR3 comes in as I dont carry tables for this eventuality.

I do up to 35 mins on 1.6 with no air/trimix (lower PO2) break. Longer than this and I do seen to feel a little chocked up (but that could be all in my head)

[Mark Chase]

When on OC, I always carry a multiple wrist slate when I dive deco and use the VR3 as the primary deco tool with a few fudge factors thrown in for good measure. That said I came to the conclusion when carrying 100/100 bail out tables that I probably didn’t need them at all (light the fire now). Using 100/100 the number of stops was very limited and I could easily remember what they were from my dive planning. All I then had to do was add my personal padding to the deco and hey presto I have bailed out.

As an example for a 60m dive for 30min bottom time there are only 4 stops??

For a gas mixing 40min bottom time there are 5?? All in all not a lot to remember.


I don’t know much about CCR at the moment so I cant comment but I doubt if the difference is massive.

ATB

Mark Chase