View Full Version : The Type XXI

04-29-2005, 12:34 AM
Here's a question I've been meaning to ask: I thought I had read somewhere (can't remember where) that the type XXI's passive sonar could generate actionable target data alone without ever having to raise the mast (like today's nukes). Does anyone know if this is true? If so, is it possible to do in SHIII?


04-29-2005, 01:29 AM
Not sure about your question but would just like to say great sig-pic !

best yet !

04-29-2005, 01:38 AM
I think you mean Nibelung sonar.
Yes, historicaly one could send the data for the firing solution collected via Nibelung sonar directly to the TDC and fire the torpedo, but NO-one has managed to figure out how this can be done in SH lll.
The devteam said there will be Nibelung sonar, but that`s just about it.

04-29-2005, 05:49 AM
yes, the (real) XXI could fire torpedo's from as low as 50m depth without raising the scope.

04-29-2005, 07:38 AM
The Nibelung isn't passive. It's active. It used different frequencies, that the Germans thought wouldn't be picked up on the ASDIC gear, so it wasn't supposed to be detectable by the Allies.

04-29-2005, 10:26 AM
The Nibelung isn't passive. It's active. True, it was an active sound location system, but it was also often used in passive mode as it was able to detect targets at some pretty impressive ranges for the time.

04-29-2005, 03:53 PM
Thanks guys; you answered my question. I tried using the type XXI's active sonar and it didn't seem to draw any attention from the escorts, but I still had to raise the scope to get a complete target solution.

I guess the type XXI's sonarman would have to be well trained and experienced and could recognize the screw sounds of various ships in order to identify them without raising the scope or at least only use the scope for quick confirmation if needed, then look it up in the ship recog manual; I'm just speculating.

I had e-mailed with a fellow a while back who had served on a Gato-class submarine. I asked him what they could determine about a target from sonar contacts only. He said they could get target course, range, and speed. Don't remember if they could ID the exact target type without using the scope (I kind of doubt it).

Thanks RedTerex. I made that sig/pic a couple of years ago when I was posting on the Wolfpack League forums. I'm glad I can use it again.


04-30-2005, 05:21 AM
That answered one of my XXI questions as I had the same query.
Another - the batteries never seem to fully recharge on mine and this means the engines never reset to standard from charging mode.
Just mine or is this a glitch??
Also the snorkel seems to give me away all the time despite having the TARNMATTE anti-radar coating??

04-30-2005, 07:04 AM
Well richbrant, I heard that at the end of the war (i.e. when you get the Type XXI), RADAR was so advanced that it could pick up the snorkel head.

Though I think that was in good weather and at a close-ish range or whatever, but still, that's what I heard.

Maybe the anti-radar coating either doesn't make a difference on the snorkel or not that much of a difference.

04-30-2005, 02:24 PM
You know a Diesel engine prolly makes an ungodly racket running underwater...

04-30-2005, 02:40 PM
That's another thing to take into account.

04-30-2005, 02:49 PM
That is a good point - I was wondering why they seem to find me easier that way than surfaced sometimes!

04-30-2005, 04:34 PM
Are you sure you don't have your radar on while running at snorkel?

04-30-2005, 05:30 PM
Another good point - when I click the "turn off" option for the radioman I'm not sure if it does..... when I press "r" and go to his station the set always seems to be on!
If I then turn it off and repeat to check it's off it is on again

04-30-2005, 10:00 PM
The best way to check if your radar is off is to not actually enter the radar man's post, but be just outside it (i.e. so you can see sonar and radar man.

The radar ALWAYS turns back on if you enter the room completely.

05-01-2005, 03:31 AM
Thanks for the tip!