increasing battery life

[-Pv-]

I see very simular results to SH3. Battery technology was very similar. The results are expected and satisfactory to me. In over three years of playing, I've not worn out the battery yet.
-Pv-

[Banquet]

Ok, I just uninstalled the battery mod to test this.

As far as I know (from sources on the internet, book and SH1 manual), here is some info on the Gato battery..

Time : 48 hours submerged @ 2 kts
Range : 100nm @ 3kts
Range : 95nm @ 5 kts
4-6 hours to recharge the battery.


Now here's what I got in testing;

Time:
2kts
Submerged 8.05. 24 hours later had 39% battery remaining (11% short)

Range:
3kts
Submerged at 05.11 - surfaced 14.44 with 10% battery.. travelled 32.7nm (67nm short)

Range:
5kts
Submerged at 15.59 - surfaced 19.33 with 10% battery.. travelled 16.5nm (79nm short)

Battery re-charge from 10% to 100% - 1 hour 10 mins.



So - on my system the battery is under capacity every time if the (few) sources I have found are to believed.. At slow speeds it's marginal.. at higher speeds it's a massive amount.

Also the battery re-charges far too quickly.

Does it matter? Yes or no depending on your viewpoint.. but imo the batteries are not modelled accurately - which is why I'm now re-installing the extended battery mod!

[CCIP]

Yes, at 2kt the range is completely right.

The problem, I believe, is that 2kt is not the actual submerged cruise speed, but it would rather be the 3.5-4 kt that we get with actual 1/3 running in SHIV.

Since the default max ranges are set at a 2kt speed rather than 4kt, there are serious penalties to range when travelling at that speed. The main way in which I modded it was to allow for a 4kt, rather than a 2kt, base submerged cruising speed.

[anthrax]

Well, according to the US Navy's

SUBMARINE TORPEDO FIRE CONTROL MANUAL, Date May 1950

The fleet type submarine. Which I guess it gato,balao, or trench class has the following performance.

310. FLEET TYPE SUBMARINE:

(a) The Fleet Type Submarine will make the following speeds submerged for the length of time indicated, if it starts with a full battery charge:
Knots Time
3.0 48 hours
6.0 3 hours
8.0 1 hour
9.0 1/2 hour


(b) Thus it can readily be seen that a major consideration when making an approach is conservation of the battery capacity.

....

[quote]
320. THE GUPPY II TYPE SUBMARINE:

(a) The Guppy II Type of submarine has characteristics different from the Fleet Type. The primary difference is submerged speed. The Guppy II will make the following speeds for the time indicated with a full battery, charge:
Knots Hours
4.3 48
5.3 36
6.3 20
8.2 10
9.4 6
9.9 5
11.8 3
15.7 1
17.8 30 minutes
[/qoute]

[SteamWake]

I would imagane as well the "good" skippers would make judicious use of currents.

Doing 2 knots in the gulfstream could net you almost 10 knots going with the current.

[7Enigma]

Originally Posted by Banquet

Good question. It's hard to imagine enough oxygen in a cramped sub to last the crew for 48 hours!

Wasn't the O2 that was the problem. It was the CO2 buildup if I remember correctly.

[SteamWake]

Originally Posted by 7Enigma

Wasn't the O2 that was the problem. It was the CO2 buildup if I remember correctly.

You inhale O2 exhale CO2... get the picture ?

[Faamecanic]

Originally Posted by SteamWake

I would imagane as well the "good" skippers would make judicious use of currents.

Doing 2 knots in the gulfstream could net you almost 10 knots going with the current.

Or - 8 kts (going backward) if running against said current....

With the aircover as it is (and dead eye dicks with dive bombing) we NEED to be able to stay submerged at least 12 hours... My routine, where there is aircover, is to dive at first light and surface when the red lights come on.

[Faamecanic]

Originally Posted by SteamWake

You inhale O2 exhale CO2... get the picture ?

Actually you would have a finite supply of O2 (whatever the sub would hold). But scrubbers (if they had them back in WWII) would remove the Carbon molecule from the O2, hence resupply some of the O2. Without scrubbers then the CO2 merely displaces the O2 as it is used up.

[SteamWake]

Originally Posted by Faamecanic

Actually you would have a finite supply of O2 (whatever the sub would hold). But scrubbers (if they had them back in WWII) would remove the Carbon molecule from the O2, hence resupply some of the O2. Without scrubbers then the CO2 merely displaces the O2 as it is used up.

Key word being "some" still you breath o2 Co2 is poisionus.

[NEON DEON]

Originally Posted by CCIP

Yes, at 2kt the range is completely right.

The problem, I believe, is that 2kt is not the actual submerged cruise speed, but it would rather be the 3.5-4 kt that we get with actual 1/3 running in SHIV.

Since the default max ranges are set at a 2kt speed rather than 4kt, there are serious penalties to range when travelling at that speed. The main way in which I modded it was to allow for a 4kt, rather than a 2kt, base submerged cruising speed.

The specs on the boat are 96 NM at 2 knots. That is 48 hours.

Double the speed and you will not make it to 48 hours.

[Triad773]

Hi there- I was curious about this subject after navigating around Oahu submerged, and was surprised at the battery life on a P-class ship. I did a search and found this thread, but I think I'd like to know a little more on the subject.

In the course of a typical day, what might be the standard speed for submerged day-long duties? 1/3rd or 2/3rds? I am thinking Ahead Standard must be for surface use under normal circumstances. I am also thinking that one can't really go as fast submerged just anticipating that they will be able to come up to recharge at dusk when they need to; that energy management must seem to dictate such prudence as to have SPARE juice if you need it, and not 'just enough.'

I would like to start out right by learning energy management as correctly as possible. I was interested as to what a sim like SH4 could teach me about historical delimmas of real Captains, and not the game aspect so much.

Any help or thoughts aprecciated-

Thanks

Triad

[-Pv-]

I did careful testing of un-modded battery duration and charging times as well as Co2 in default game. The results are here:
http://www.subsim.com/radioroom/show...hlight=battery

I see no reason to use any battery modification because the default game is easily within reasonable historical values.
-Pv-

[Triad773]

Hey PV thanks much for the link. My having no familiarity with what's the baseline for such as battery performance on a sub, it looks like a great resource.

Having just started I am having the settings as real as I can stand them and go from there. That and I am really into the historical factors of how they shaped what really happened.

Cheers

Triad

[-Pv-]

I don't think WWII sub had Co2 "scrubbers" in the modern sense. They just sprinkled thin layers of Lithium Hydroxide out of canisters onto shallow pans and plates and distributed them around.
-Pv-