GWX - Silent running in Type XXI
 

First of all, I want to congratulate the developers of GWX... It is excellent !!! :D

Now I want to point out a little concern about the Type XXI in GWX. I have noticed that since the December 23 fix, when I order "silent running" in a type XXI the velocity is lowered to around 2 knots. I understand that it is done to have real silent running and to avoid being heard by the enemy ships. However, this low velocity feels adequate for the normal "U-boats", but not for the Type XXI. If I understand it properly, the noise emited by a submerged U-boat in SH3 does not depend only on its raw velocity, but on the percentage of the maximum possible velocity it is actually using... am I right? In that case, the safe "silent running" velocity for a Type XXI should be much higher than that for the other U-boats... am I right?

Thank you very much for your help !!!


Txema

P.S. In real life, the Type XXI had a "creep" motor that allowed it to navigate under water at moderate velocities and producing very low noise. This seems another important advantage of this U-boat and it would be very good to have it modelled somehow in SH3 !!! (for example allowing it to navigate submerged at moderate velocities (higher that 2 knots!!!) without being detected by the anemy hydrophones).

http://www.uboataces.com/uboat-type-xxi.shtml

hmmmmmmm
 

I drive a customized Type IXB however as I recall Type XXI had a silent speed of 5 knots. I will look and see if I can locate a way to change silent speed order for type XXI however GWX team also adjusted enemy AI sensors so it may be problematic for you as they are generally saying "in GWX two knots is silent speed" it may be that even if we change the order
it could create a stealth problem for you so before you change it back it up so you can change it back if you need to............Ill let you know here if I find it MM.

OK
 

OK the best suggestion I have is that I dont know how to change the speed assigned to the order for silent running maybe someone from GWX will stop by with that, in the meantime what I suggest is this

in the file Ubisoft/SilentHunterIII/Data/Submarines/NSS_Uboat21/NSS_Uboat21cfg

you will find this


[Unit]
ClassName=SSTypeXXI
HumanPlayable=YES
Interior=data/Interior/NSS_Uboat21/NSS_Uboat21
UnitType=200
MaxSpeed=15.6
MaxSpeedSubmerged=17.5
Length=76.7
Width=6.6
Draft=6.3
RenownAwarded=200


[Salvo]
1=1,3,5,2,4,6
2=1,2,4,6
3=1,3,5,6
4=1,3,5
5=2,4,6
6=1,4
7=2,3
8=5,6

[Properties]
PeriscopeDepth=16;meters
SnorkelDepth=16;meters
CrashDepth=70;meters
MaxDepth=500;meters
SurfaceDepth=10;meters
TorpLaunchMaxDepth=50;meters
StormConditions=14,0.4;max wind speed [m/s], max rain intensity [0,1]

[EngineProperties]
AllStop=0.00
AheadSlow=0.12
AheadOneThird=0.57
AheadStandard=0.80
AheadFull=0.94
AheadFlank=1.00
BackSlow=-0.26
BackStandard=-0.40
BackFull=-0.53
BackEmergency=-0.66

what you can do is figure out what percentage of your top underwater speed adds up to 5 knots and enter that percentage as ahead slow speed above, notice that no percentage symbols appear in the settings, here percentages are expressed as decimals

the Idea being that when you order silent running immediately after hitting the z to order it you immidiately hit button 1 to order the speed you desire Your Type XXI is equipped with Creeping motors in the game while under silent running they will be engines used.
I once swapped them out for the engines on my type IXB as my reg motors.

also with GWX bouancy you should when at 0 knots you will drift approx two metres above ordered depth this can cause your conning tower to broach. you can adjust periscope depth here but the problem isnt a problem over 4knots so you may not need to.

hope it all helps MM.

Open the above file

In the section

[EngineProperties]
AllStop=0.00
AheadSlow=0.12 <---- change to 0.40
AheadOneThird=0.57
AheadStandard=0.80
AheadFull=0.94
AheadFlank=1.00
BackSlow=-0.26
BackStandard=-0.40
BackFull=-0.53
BackEmergency=-0.66

However as posted above you WILL be detected at silent running
Yes the XXI had a creep motor in RL and indeed does so ingame but its not used
Go figure

[QUOTE=bigboywooly]Open the above file

In the section

[EngineProperties]
AheadSlow=0.12 <---- change to 0.40


Yes that works, but i like to use the standard 2knots speed, it more intresting when the destroyers starts to get youre sorry a** ;)

No offence, if he want that he should use the change :)


Greetings

_Gabriel_

As an aside, from my understanding, your underwater speed isn't what dictates passive hydrophone detection. it's your engine's RPM's. Theoriticlaly you could do 17 kts underwater, but so long as your RPM's were say, 100 or less, you'd be silent enough to escape detection.

edit: i just had an idea, i dont know if it will work, and i dont really care enough to try it myself.

But...

All these are.. i think.. are a percentage of your total speed (or RPM). What if you were to increase the maximim speed of the sub to somethin totally outragous. But then limit, or throttle back its top speed via the engine properies in the CFG file.

For instance, 12% of say.. i dunno. 30 KT's is going to produce alot faster speed then 12% of 17 kts, and perhaps be somewhere near the same level RPM?

Then you take the max speed and cap it at i dunno, 60% .

Just a thought, i dunno if it would work.

True
But the only way to lower RPMs in game is to lower speed

Unless you have a new propulsion system :rotfl:

see edit. ;)

I don't know if it would work though.

I see no reason it shouldnt
Trouble is they would all be running around at 30kts after changing the files
:rotfl:
No self restraint

Hi,


well 17knots are the fullspeed of the XXI, 12% from 17knots are nearly 2knots, so when he raise the percentage to 40 the silent run would be nealry 7knots.
But 7knots silent running? ohh thats a cheat ;)

I like the 2knots if XXI or not, it makes the game sweeter when the damn destroyer lost you ;)


Greetings

Gabriel

Ok Ok
 

Hold it Hold It ok you can if you want change the horse power the rpms
and the speed it is possible then to make the type XXI silent in GWX at
5 knots I will be back with the formula this evening I have to test on
the custom sub cause I dont want to ruin my campaign sub.

give me an hour and I will let you know what settings you need
MM.

Like the tools arent out for everone to use to change the sub's speed however they wish ;) If people are going to do something funky, their going to do it, regardless. :88)

Well, i dont use the type XXI. I wanted to at some point, but thesedays i just have ZERO interest in it. at any rate, 5 to7 kt silent running a cheat? Personnaly i don't think so. One that that isn't modeled in this game is cavatation. Cavatation makes noise. More advanced propeller designs make less noise. It stands to reason that the type XXI would have less propeller cavatation then other uboats, thereby allowing it to move faster underwater with less noise.

Ok Im back
 

alright well my new home made JSGME Fast Loader for single missions works
great I was In and out four times since my last post.

Here is what I learned

When you change submerged RPM or Horsepower it doesnt appear to change
your sound signature in the game. changing rpm appears to change the pitch and beat rythm of the noise you make but not the volume relative to detection by AI. Changing Horse power will only affect your acceleration curve
and although I thought it would reduce noise output by working less hard to go at speed like the real world it didnt in the research scrimmage.

I am afraid that this avenue of solving the problem is closed it is in the sensor and AI that detection over two knots is happening not in the "noise signature" of the sub, (I think!)

also since I forgot to right them down could somebody look in file analyzer and pm me the correct horsepower and rpm settings for underwater in the type XXI I would like it to be correct when I get there in my campaign.
MM:|\\

Well, whatever the rate... something you guys need to know about the Type XXI.

IN SH3 it is the BUGGIEST player U-boat available... and understandably so from my point of view. (seeing the challenges that the SH3 Ubisoft dev team faced)

I'm sure that the XXI was the least of their priorities in comparison with the commonly used U-boats.

My research yields a possible TWO short war patrols carried out in the XXI in real life... neither of which yielded any sinkings. (IIRC Erich Topp carried out one of these patrols.)

We will come up with a silent running solution for the XXI in GWX... but it will naturally have to be a compromise of sorts. We'll have to work with what we've got.

KL