New FREE Beta Deco Software for Linux/Mac/Windows - Need Testers

jradomski

Steve,
for oxygen consumption (not general RMV) most of us use lpm as that is pretty much standard with the administration of medical gases.. for low flow rate most of the flow meters are all in liters per minute... we are all taught metabolic consumtion and dosages in liters per minute or cc.. so its not out of place here..
its much easier to rember 1lpm as oposed to .035cu ft per min

__________________
Joe Radomski
CCR Trimix Instructor Trainer
ANDI Instructor Trainer Director #10

All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.

UKSteve

Ah...ok.... I guess its a bit like using a ppO2 of 1.3 bar

Might be nice for software to allow one to chose units a bit more discretely than simply Imp vs Metric switch button.

Also if software is tracking CCR O2 consumption then perhaps the facility to choose different rates for dive and deco (bit like is common for O/C RMV?)

Steve

brockbr

BTW Guys,

A Couple of things:

1) The Metric version is coming - Like I mentioned in #11 of the first post, it's coming (days, not even weeks)

2) The O2 Consumption for CCR <<edit>>was<<edit>> wrong - This will be fixed today (its showing depth compensated and of course shouldn't be Thanks Kevin!) - This has been fixed

b.

brockbr

Steve,
Can you elaborate on this? I ask for 2 reasons:
1) The auto-bailout function assumes the worst-case time to have a catastrophic failure. By basing the bailout gas requirements on the worst case, it makes sure you get in the water with *at least* that much gas, and a profile to deco with that, even if long, would be safe. (It does this by looking for the highest tissue loading in the profile).

2) I originally intend to add a feature which allows you to pick the bailout point, but my thinking was for completely different reasons, mostly related to sawtooth profiles like those you see in a cave. Given those conditions, it would be difficult for the software to determine the "worst" point, not knowing the dive environment.

If you wouldn't mind, could you post some examples and reasoning of what you're going for?

Thanks
b.

UKSteve

Hi,

What I mean is that if you have to bail out on bottom and then not begin to ascend at planned ascent rate immediately (i.e. to get out of a wreck or back to line where perhaps you have staged some of your bail out) then your bailout gas requirement is going to be substantially greater than expected. By "expected" I am assuming the program starts O/C usage at the beginning of ascent.

It's a relatively minor issue for me ..not being one to grovel that far into a wreck!!! It has been disussed etensively in the bailout planning threads on Rebreather World.

Love the look and feel of the interface by the way!!

Steve

Ben Field

Hi,

Looks V pretty, I like the way the profile graph changes live as you fiddle with the GF's, nice.

1. Is there anyway you can overlay a bailout plan with different GF's?
2. I'm not sure how you plan to add waypoints on the Iphone, any chance of making the waypoints draggable? Not that the test entry is bad.
3. Assume the CCR planning doesn't work yet, seems to be OC only?
4. Any chance of having an "output plan" button that spits out a taxt file/spreadsheet/document/html of the plan (like DDPlan does?)
5. Gas switching doesn't seem to have any effect at present on the plan.

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Beware Fridge Suck

wrecktek

I like the GUI and the web site with the working screen is a great lead. Please add me to your list.

John

brockbr

Re: 3 - ?

Put this in the waypoints:
130/30-21/0-1.0

That's 130ft for 30min on air (no he) with a setpoint of 1.0.

BTW, it doesn't switch to CCR mode until you provide a setpoint on a waypoint.

Let me know if you don't see it.

b.

Stephane

Hi,

What are the descent and ascent rate?
I'm comparing with MV-Plan and I find big differences:
GF 30-75, 210ft for 25mn on a 10/52 mix, SP=1.3, you soft gets me out in 71mn and MV-Plan in 96mn (84mn with VPMB +4 conservatism).

__________________
Stéphane
Hammer-rEvo powered!

brockbr

Stephane,
There is no padding or conservatism built into the algorithm as I've implemented it, only straight Buhlmann/16 with GF support.

Of course, I don't know the internal workings of MV-Plan, but I'd have to wonder if they cut plans directly at the Buhlmann numbers or not.

At any rate, this is a great observation - The shallow stops don't look right to me (20 - 1, 10 - 1). Let me look into this exact example and see if I can figure out what's causing the shallow stops to be so short.

BTW - The descent and ascent rates are set at 1 BAR min (1 ATM, 33 Ft, etc), to be conservative. I'm going to allow these to be set in future builds.

501 Minute Stops
Also - A few people have pointed out that some shallow stops appear at 501 min. The reason for these is that the Buhlmann model includes absolute pressures that are allowable for any given compartment considering the loading. What's happening is that as you get near the surface, mathematically it gets closer and closer to a rounding error to get you out of the water. In some case, this rounding error won't allow the model to off gas any further (becoming balanced as at would at the surface), and it spins off. I put a hard limit of 500 minutes - So 501 is a by-product of the math exhibiting this error.... This is why we test I'm working on ways to address this.

b.