forum.heinrichsweikamp.com

Hi all,

This was a worst case ceiling (10 min at 60 m, Tx 18/50, GF 15/80) with the previous model:

> [img]http://forum.heinrichsweikamp.com/file.php?2,file=359,filename=deco_spike_GF30-80.jpeg[/img]

With the modified firmware 2.61 (thanks to an idea reported by wrobell ), we now have the ...

Hi Paul,

In OSTC firmware, GF_low is pinned (for the current dive) to the lowest ceiling you encountered.
Meaning is you start off-gasing while playing around at mid/shallow depth, the model keep in mind you have been deeper, and that you have more secure stops to do.

Regards,

Remarks:


With a travel mix of Tx10/50, you are doomed. The latest version of O STC Planner won't let you do that anymore...

I can reproduce it with GF 15/80, And a single Tx18/50. So this is NOT a question of gas switch.

I can reproduce it with just air. So this is not a question of Helium ...

Hi all,

I am well aware of this. It is (I think) related to the Gradient Factor algorithme, that is unstable in deciding where the decompression starts (ie. what is the reference depth where to apply GF_low). I have been hunting it for nights. Literally...

The good news:
* As OSTC Planner improves ...

Hi Jerry,

How did you setup your project ? MPLAB.X ?

Regards,

[quote="Good point good reason for 6m.."][/quote]

Yes, but also keep in mind you won't decompress much at 6m unless you have enriched gas.
That is to say air is most of the time not enough to finish decompression at 6m.
Meaning you might have to stays for hours in deco...

Regards,

Excact, there is a bug here... :(


It does changes when you enable/disable your first gas, which should not change anything:
[pre]
OC gas list:
* First gas#2 = 14/50 DISABLED
* Deco gas#3 = 50/20 at 21 m
* Deco gas#4 = 100/0 at 6 m

0:00 81.0m DESCENT DONE
...
15:04 81.0m Deco:
48 m : 1 ' 19 ...

This is a missing feature.

The > kludge is to forget about the travel gas, start (planning) with the bottom gas, which is coherent with an instant descent.

Regards,

@DiverM

Thanks for your insights.

[quote]DAN and the USN have several papers. But if you want to read up more, wikipedia offers plenty references.[/quote]

Can you be more specific ?
* Wikipedia cites a single master thesis from 84: Uguccioni, DM (1984). Doppler Detection of Silent Venous Gas ...

@nakatomi

Interesting. But:

* The first paper advocate a deep stop at 15m too. And reason on compartment loading (with a final illustration using doppler bubble measurements). Using Gradient-factor (which computes from compartment loading too) to generate such deep stop(s) seems appropriate ...

@DiverM: I'm happy I contributed to feed that troll.

But more seriously:
* I know about micro-bubbles from interstices or cavitation. In particular created by the valves of the hearth. But this have no direct relation with safety or deep stop.

* I known also about Erik's Baker papers. And GF. But ...

This discussion turns creasy... (no offense meant here)

People now want a count-down to be working in a condition they perfectly know to be inefficient for off-gasing.

I am curious to know how to justify that

@Lorenzo:

CF55 IS a minimun time.
And waiting one minute at depth greater than 30m DO change all the rest of your deco, so I don't understand the second part of your request...

Cheers,

Hello,

Here is what I get from OSTC Planner :
[quote="Bühlmann ZH-L16C-1a 2002 with GRADIENT FACTOR decompression:
* GF_low (CF32) = 20 %
* GF_high (CF33) = 85 %
* deco offset (CF16) = 1.0 m
* last stop (CF29) = 3 m
* dive started at Pamb = 1013 mbar
Gas#1 = 18/40 at 0 m
Gas#2 = 50/0 at 21 m
Gas#3 ...

Hello Rob.

This is not new. I think it have always been the case (lately ?). New stable versions do properly reset all CF values to defaults.
Beta version do not (because it is too dangerous for not yet polished firmwares).

Regards,

Hi Vortax,

OSTC Planner is not just a dive planner. It runs the OSTC code and simulate the OSTC underwater behaviour as much as possible.

If you look closely, you will see the first runtime is computed at 30:04, the second at 30:18.
Meaning:

* The OSTC continuously recompute your decompression ...

6 months ago, I started to distribute the first public version of OSTC Planner .

Origins

I had the application around for nearly one year, it was my test-bed to propose, develop and test new features for the OSTC dive computer. As such, graphs and runtimes started to appear in this forum in ...

@scubatino:
So it would be nice to add a "calculation field" where i can enter 933 Meters (above sealevel)

Interesting. I added the altimeter, so I should be able to reuse the same formula...

A new version 371 is online HERE .
- Identical on Mac and PC.
- Upgraded for the latest firmware beta (2.23).
- Includes support for CF64 (inactive gas color).
- Includes automatic check of new version (was missing on Mac).
- Plus minor bug fixes from the 370-mac-only beta.

@Jean-François: yes, I ...

There is a new beta version available for Mac users here . Mainly this is a repackage for 10.7 (Lion). It also provides checking for upgrades, and various small bugfixes:

Gas at 0m should not go red when not used.
CF Editor should open on page CFI.
Quit should quit, not just close the main ...

As a matter of fact, I also look for volunteers to translate OSTC-Planner software's messages to Italian...

Cheers,

Hi again,
I think it is not a problem of DNS and update. Both

nslookup www.heinrichsweikamp.com
nslookup www.heinrichsweikamp.net

returns the IP address (87.106.57.34), which have to be the new one.

Trouble is that:
http://87.106.57.34/
it failing... :(

My raw guess is that in your HTTP ...

+1
A permanent redirect link to the new website would allow to find you on google...

Hi Uwe,

I'd like to add the pSCR mode in OSTC Planner. Will you be able to beta-test the planning results ?

Regards,

Hello,

Just a word: version 350 of OSTC Planner is available on the website .

New features:
* Upgraded to firmware 2.22 (beta), with room for the new CF (CFIII, still unused).
* Embebed the screen copy feature, so you can save images of the computer's screen.
* Added re-sizeable button window, to ...