http://www.uboatarchive.net/DesignSt...ypeIXC-S38.htm

The air purification and oxygen renewal systems are based on the requirements of 44 men during 72 hours total submergence. For air purification, a total of 315 canisters, each capable of absorbing 400 liters of CO2, are provided. For oxygen renewal a total of 13 flasks, each containing 50 liters of oxygen under 160 atmospheres (2275 p.s.i.) pressure, are installed. 44 sets of emergency breathing apparatus are carried on board.

I agree with your statement about the absorption of oxygen.
Soon I will expose here a more precise model of absorption of oxygen with all the accompanying effects on man because of his lack of air.
about the complete amount of oxygen in the submarine just wanted to say that after those 30 hours in the submarine would only live for anaerobic bacteria.

@Stiebler, NGT:

In forthcoming V15G2, there will be both, the new O2-supply-Mod AND the older CO2-Mod from V15E, hoping, that all are satisfied now. But only one should be chosen. This is a temporarily solution until we have reliable facts.

Thanks for options !
 

Thank you very much!

I like your CO2 mod, and you spent a lot of time for that. Is good that remains alive.

Very kind of you :salute:

I like the newest CO2 mod and the previous one too :). Everything that you come up I like, so keep up the good work and be more aggressive!

@H.sie, NGT:

I have now completed a full career (1939-1945) with NYGM 3.5 and H.sie's V15G1.

There were no issues, apart from the argument concerning oxygen supply, so H.sie has completed a brilliant job again!

I have constructed a new Options Selector (version 1.4) with two slider controls which enables the rate of use of the renewable and non-renewable (compressed oxygen) components to be varied from their defaults (1.0 and 1.0 respectively).

I have found that it is possible to set values which seem to be acceptable for NYGM, namely:
Renewable oxygen: setting = 2.5
Non-renewable oxygen: setting = 2.0

These are values that I obtained for submerged travel:
U-boat Renewable (hours) Non-renewable (hours**)
IIa .... 14 1/2.................. 38
VIIC .. 16 3/4 ................. 46
VIIC/41 - same as VIIC
IXC .... 19 3/4 ................ 58
IXD2 - similar to IXC

[EDIT: ** Hours to 50% usage on scale. Double values for total consumption - Sorry about that.]
How does this work out in practice, using the new values I mentioned above?

NYGM models the high density of air attacks in the Bay of Biscay, north-west of Spain after May 1943, fairly accurately.
If you sail a VIIC from St Nazaire out into the Atlantic in July 1943, sailing as close as possible to the north Spanish coast during the way out, then the U-boat has almost half-empty compressed air by the time it reaches square CF. This result is obtained simply by ensuring that the U-boat surfaces only during darkness, and never during daylight.
And it still needs to return through the Bay of Biscay!

Therefore, I consider these to be settings that are the minimum acceptable under the worst conditions of the war.

And therefore, it is not necessary for H.sie to re-introduce the oxygen supply of V15E as well as that of V15G1. I can accept the existing V15G1 with revised optional (slider) settings.

@NGT: perhaps you would like to carry out the same operation (sail a VIIC boat through the Bay of Biscay in July 1943 using NYGM 3.5), but with the default settings for oxygen supply, ie those currently in V15G1. It will help you to understand the problem of the default settings.

Stiebler.

@Stiebler: Thanks. That would indeed save a lot of work.

One thought: You have played a whole career 1939-45 in one day? Then you obviously used very high TC. I discovered for very high TC an inaccuracy in O2/CO2 calculation. Values differ for lower TC.

Definitely not in one day, no. About a week.

However, I ran my tests for oxygen consumption reported above at 1024-2048x tc.

I shall re-check to see if this affects figures.

EDIT:
Times with settings 2.5x renewable - 2.0x nonrenewable:

TC=2048:
Can stay dived for 14 1/4 hours on renewables, 46 1/2 hours to 50% usage of renewable O2 on gauge.

TC=256
Can stay dived for 13 1/4 hours on renewables, 36 3/4 hours to 50% usage of renewable O2 on gauge.

Yes, H.sie is right, quite a large difference at higher Time Compression.
Stiebler.





Stiebler.

@NGT: Please read this post:

http://www.subsim.com/radioroom/show...postcount=1821

I suggest to give Stieblers suggested settings in forthcoming V15G2 a try !!!

If that works good for you (as it does for Stiebler) I would save a lot of work and time to re-implement the old CO2-fix. I know, I announced to re-implement it, but that announcement based on Stieblers conclusion that the O2-Fix does not work properly. He in the meantime corrected that conclusion - so I offtake my announcement and apologize for that situation.

This was a good demonstration what can happen if one tries to fit other peoples taste.

Captains, all OK !
 

@h.sie

No problem for me.

Please proceed as you like. No need for apologizing at all.

Thanks to you and Stiebler we have a new game.

I have all your patch (yours + Stiebler) and for sure, I did, without problem, my personal choice.

Please follow your instinct, and the game will be better for everybody.

Really best regards :salute:

New Options Selector (version 1.4)
 

@Stiebler

This new version 1.4 of Options Selector can be available for download?

Thanks mate.

@NGT: The new OptionsSelector alone won't help you, since it can only be used with forthcoming V15G2, but not with V15G1. Will take some days.

:DL
Especially when I see these messages?
I understand what you write ... I do not understand the meaning of the proposed warnings ...
In the submarine there are everything to reduce pressure (and in some cases to increase pressure without using oxygen).

Cheers, Alex.

@Anvart: These messages result from my misunderstanding of Stieblers statement regarding air pressure in the sub. This misunderstaning has been resolved in the meantime.

any progress on something here?

:salute: