so i'm sitting at 20m in the middle of a convoy...

[capt_frank]

dead still rigged for silent. i had already made my torp run and was waiting for everything to settle down so i could use my stern tube against a stragler.

i got pinged, no problem i thought, i'm at dead calm, no one is making any noise.

along comes a destroyer and dc's me...now i'm slightly damaged only to the extent of the conning tower.

still no movement from me...

along comes the second destroyer and dc's me rite on the money...

and that's all she rote, i'm dead.

question: how could they find me at dead still rigged silent??!!

oh, it was july 1940...viiC

[Dowly]

I`m not too familiar with hydrophones and stuff, so this isnt 100% correct what I`m about to say.

Destroyer with that ping-thing (cant remeber name of it) is like a bat, and you are prey. The destroyer sends a sound going thru the water and when it hits you, the sound is mirrored back to the destroyer. So that`s how he know where you are..... i think! :roll:

[Gizzmoe]

As you said, they pinged you, with active sonar. The sonar ping/wave bounced of the submarine and travelled back to the destroyers hydrophone. With passive sonar you only listen to underwater sounds, so when you are silent they can´t hear you.

[Dowly]

As you said, they pinged you, with active sonar. The sonar ping/wave bounced of the submarine and travelled back to the destroyers hydrophone. With passive sonar you only listen to underwater sounds, so when you are silent they can´t hear you.

That`s what I meant, I`m just not too good at explaining things! :lol:

[capt_frank]

so does that mean when i'm pinged, i'm "ponged"? :hulk:

would a lower depth help? i was at 20m... :hmm:

[seafarer]

Active sonar is high frequency, pulsed sound (ie. a "ping"), sent out by the shio searching for you (as opposed to hydrophones, which just passively listen for your sound). If it hits you and the ship sending it gets the return, you are locked.

If pinged, you need to MOVE, change depth, change heading, use decoys (if you have them). Sitting silent and still is a death call if actively pinged - they now know where you are and will hammer you.

MOVE.

[cunnutazzo]

also, it's important to show the minimum Uboot surface to the enemy sonar.

[Sawdust]

would a lower depth help? i was at 20m... :hmm:
I used to "hide" at periscope depth, but I've had much better luck by hiding at greater depths, say 50-100m. (Just be sure to know how deep the water is!)

[gdogghenrikson]

I usally hide at 25 meters

[capt_frank]

thank for the info guys! :)

frank

[Gairith]

I run to 50m and drink a cup of coffee. If pinged I go to 75 or 80m and refill my cup I just spilled.

[Mike 'Red Ocktober' Hense]

yup... someone said it best up there... when you're pinged, your pretty much ponged...

20 meters is just about 60something feet or so... ya gotta get deeper than that if possible... and ya gotta be able to manuever, once those depth charges are in the water...

... and if the Kriegmarine sub store has any of that Alberecht (?) anti asdic stuff... get some, and coat your sub with it before going out on patrol...

coat your crew with some of it too if they aren't acting right :-j

--Mike

[djv]

Well, if you are ponged, deeper is better, I think. It was in SH1 and SH2 and in RL.

SH1 had tempreature inversions too, that helped.... Would that be moddable? Lemme search.

edit Searched: not an issue it appears.

[Mowgli]

I am sure someone more knowledgable than myself could explain better but here is my take.

In the early "The Happy Days" you could lurk at periscope depth and wait into one of the convoy columns. The DDs equipment in those days was not so hot at shallow depths.

Later in the war, with their newer improved equipment they started to kick a*** big time and the happy days were over.

I am in early 42 and never, never lurk at periscope depth in the path of a convoy now. Well off to one side at about 50 metres I surface and fire at around 2000 metres. Then I am down deep and scuttle away like the big girls blouse I am. My men love me

:-j

[TreverSlyFox]

An Active sonar "Ping" tells the enemy "Where" you are, it doesn't tell them how "Deep" you are, that is purely a guess on their part.

When you get pinged, listened to the return and how "fast" it is, in other words how quick the return "ping" echo is. Ping.......................Ping they'er a ways off. Ping...Ping they'er right on top of you.

If your hearing that Ping...Ping GET MOVING and CHANGE DEPTH AND HEADING!! He's on top of you and is making his run on you, Depth Charges to follow real quickly. He doesn't really know how deep you are but most likely he's going to set his depth charges for varying depths to "Bracket" you. First two charges at 30 m then two for 50 m and maybe two for 70 m or some combination like that.

If your sitting still your dead meat!! If you listen closely as he starts his run on you you'll hear him accelerate (screws pick up speed), Hit Flank Speed, Change Depth and Hard Over Pt or Stb.
As he passes over you, your in his baffles and he can't hear you at all, plus the noise from the depth charges going off. After the last depth charge goes off, CUT your speed to 3kts Silent running again.

Just remember, if your ass end is pointed at him, he's in YOUR baffles and you can't hear him. Never sit still if you being actively pinged from close range, change heading and depth all the time.

[kiwi_2005]

I seem to never get hit at 30-feet i dont know why but, they either set charges to periscope or around 50 feet or deeper but never 30. once i had 2 destoryers after me, i stayed at 30 at slow-speed and went to external view and watch where they dropped them, always above or below but never on target i was always allowed to slip away :cool: Dont know if this is a bug or thats how they did it back then.

[FAdmiral]

Sitting dead still & quiet in SH3 will get you just dead. You have
to keep changing, up & down, right & left, slow & fast. Make
sure when they have you and drop DC's, you are long gone.
Being deep lets you get farther away before the charges go off.
Dead still translates into a dead duck....


JIM

PS. As for the 30 meter thing, maybe you can get away with it
early in the war but its gonna kill you when you least expect it.
Assumption is the mother of all screw-ups !!!

[Ahoy!]

If you have BOLD, launch one, change course and go deeper when you are getting pinged. I have tried this tactic in 43-44 and it works. But don`t go above 2/3 speed, they will hear you at once.
Another great thing about this game, BOLD actually works if you use it the right way.

[Type941]

as soon as they start pinging you, forget about standing still.. as soon as the waves hit the body of the sub, they know exactly where you are and are rushing there to drop da bombs.

[kiwi_2005]

FAdmiral, will the PA team be doing a Pacific Aces for SH3 :D I played SH2 PA to death. loved it! imagine the US subs in SH3 they are way larger so the beauty of them would be mind boggling :rock: [/b]

[FAdmiral]

Not likely, the models of the ships are such that there is no way
now to create new ones in SH3 like we did in SH2. Unless the
code was released (even less likely), we will have to wait & see
if there is a SH4 and what kind of theatre the game will occupy.


JIM

[hakkikt]

One other thing:
If you activate your observation scope ("O"), extend it just a little, and set it to look up straight (you cannot do that with your attack scope), you can see where the destroyer is above you. The moment he is right above you, you can go to flank speed for a short time, he wont hear you. You also see how he is approaching -> change your heading so that it is right angles to him.

Normally, the rule is: the deeper you are, the safer. In the early war years, they cannot find you at maximum depth. Later they can (and like to bomb that depth) so be careful. Even later, with the Type XXI, go to 230+ meters, and all will be well.

[Kapitän Cremer]

Here's a really noob question, bet here it goes:

If the Enemy is using active sonar and chases you around, and you don't have any BOLD to distract them with, what can you do? Hope that they eventually go tired and return to the convoy?

A few minuts ago I played the Gibraltar single mission in my type IX sub in 1942, and after sending the carrier 4 torpedoes the 5 destroyers were right on top of me, firing hedgehogs and DC on me, trying to blow me to hell....

I managed to evade them several times but after 10 minutes they scored a good hit when 2 destroyers made their move from two aproching angles.....It seems like they got the entire weapons arsenal for the destroyer force in the Atlantic.....Does anybody knows if they ever run out of ammo....I noticed that at least one or two sat still on the surface not beeing in the fight...is it posible that they had run out of ammo ?

[Sawdust]

If the Enemy is using active sonar and chases you around, and you don't have any BOLD to distract them with, what can you do? Hope that they eventually go tired and return to the convoy?
That might work! But, just remember that their sonar is not perfect, so it is still possible to slip away (eventually) even when it seems hopeless.
I'd recommend just going deep, slow, and silent. Change course occasionally if it seems prudent.
Speed up in short bursts to avoid depth charges (the extra noise you make will be masked by the explosions).
Of course, sometimes, there will be no escape!

[FAdmiral]

When against multiple DD's, your chances of survival are very
dimished, especiall in the later years. If you must try to sink
a high-pro target protected by many DD's, make sure the water
is very deep in every direction. if not, forget it if you want to live.


JIM

[TAW_CZAREJS]

From what I understand, it is possible for the escorts to run out of depth charges. No idea how long this takes though. I wouldn't want to sit around though to find out. :gulp:

[jason10mm]

FWIW, I have heard "cavitation" noises in my sub while drifting at periscope depth. Not sure if they are erroneous program noises that only I can hear, or if they reflect some flex in the sub at such a shallow depth due to heavy surface seas (it was choppy upstairs, but not raining). No destroyer homed in on me, but I was well away from the convoy when it happened so I don't know if they could hear it or not. Won't make a difference if you are being actively pinged, but might if a destroyer is drifting nearby while you try to slip by.