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-   -   Any hope for shallow water victim? (https://www.subsim.com/radioroom/showthread.php?t=116800)

maillemaker 06-15-07 12:51 PM

Likewise, I have never had success sitting on the bottom. Without fail they drop charges right on me and that's the end.

I think back to that line from "The Matrix":

"You see an agent, you do what we do. Run. You run your ass off."

headcase 06-15-07 01:04 PM

The only way I've ever survived something like that was to send 'em down. Bait the poor fools into coming at you dead on your bow or stern. Clear yor TDC and lock scope. At @ 500m they should be commited to a DC run and you can ram an eel right down her throat and make the nasty tin can choke on it. :rock: Just don't miss. Makes for a very bad day at work.

WolfOfCampscapel 06-15-07 01:06 PM

Heh. On my second patrol, still in 1939, I evaded pursuit with 15m water depth to work with. No idea how they managed to lose track of me, I should be mangled wreckage...

Nowadays in '40, with a bigger boat, I wouldn't dare try.

Jimbuna 06-15-07 02:04 PM

Sitting on the bottom does not afford you any advantage :nope:
Once/if detected your best chance is staying on the move :yep:

MENTAT 06-15-07 02:18 PM

Quote:

Originally Posted by Sebbe02
don't overestimate distances, mentat.

and it's exactly due to the close distance that there high speed and manoevrability may just not be good enough.

Anyway, it's a last hope tactic. But if you're caught in shallow waters, and you here the other destroyers coming, you may need that last hope.

Not an answer to my call;

once again:
what has happened to the "arming range of torpedoes" ?

MENTAT 06-15-07 02:21 PM

Quote:

Originally Posted by danmir
I have this same problem, shallow waters are just death for me at the moment. I have read some good suggestions on the boards here and mean to try them at my next unavoidable shallow encounter:
1) if its just one DD, and you hear the active pinging, they are not being passive, so crank up the speed and try and get some distance
2) Likewise, if they are not pinging be silent
3) if you are being pinged, show them your narrowest aspect so they get a smaller return (point bow or stern towards them)
4) try and take advantage of their baffles. From what I gather, ADSIC only applies about +/- 45 to 60 degrees off the DD bow, so if you get farther off than that, you "should" be safe. Also, I think DD passive listening applies +/- 135 degrees off their bow, so get in the rear quarter and you are invisible.
5) ADSIC range is limited to "only" 1-2.5 km (longer later in the war, closer earlier), so if you can spend some time in the baffles at high speed, maybe you can get out of this range.

Very nice summary! I will stick it to my monitor pal! :up:

Sebbe02 06-15-07 02:31 PM

sorry mentat, It should be: don't underestimate distances.
I'm just saying that i've noticed that you often have the necessary 300m, unless of course they're right on top of you (but then it wouldn't be wise to stick up the periscope, would it?:D )

MENTAT 06-15-07 02:44 PM

if anyone was able to hit a destroyer within 300m sweeping all around you drawing circles all the time with hi speed... please respond. cause i have never managed nor winessed such a thing!

CapZap1970 06-15-07 03:10 PM

Ok Kaleuns:
Here is the process of hiting the seabed very gently, I hope the picsare sharp enough.
http://i156.photobucket.com/albums/t...eenshots/1.jpg
http://i156.photobucket.com/albums/t...eenshots/2.jpg
http://i156.photobucket.com/albums/t...eenshots/3.jpg
http://i156.photobucket.com/albums/t.../Touchdown.jpg

Hakahura 06-15-07 04:03 PM

Top pics CapZap1970.
Never tried bottoming to evade myself. Moving targets harder to hit and all that stuff.

MENTAT so far as I know you'll never hit anything 300m or less the torps need that far to arm. If the DD thats close your only hope of killing him is an acoustic torp.
These never seem to travel directly to the target and will have time to arm.
best just to not get detected in the first place. of course sometimes you just can't help it.

Hadrys 06-15-07 04:18 PM

Hmmm I managed few times to loose the chase without even a bomb near just by hitting the floor hard! It was in quite shallow waters like 60-80 so after hearing a DD coming over me and dropping bombs another Alarm and it finishes on the bottom because I forgot that I have only 30m left... So I hit the bottom and have slight damage but it sucks me in. I can't move so turn off the engines, fix urgent damages and be quiet... I works, they loss my track completely. I wonder if it would work the same way if I would sit on the bottom gentle. Time compression shows near land state in my case... May 1940.

MENTAT 06-15-07 06:11 PM

Quote:

Originally Posted by Hakahura
MENTAT so far as I know you'll never hit anything 300m or less the torps need that far to arm. If the DD thats close your only hope of killing him is an acoustic torp.
These never seem to travel directly to the target and will have time to arm.
best just to not get detected in the first place. of course sometimes you just can't help it.

EXACTLY.

You hear that Sebbe02?

Nuoz 06-16-07 11:22 AM

I didnt manage to survive even in 1940. I loaded a previous game (undetected still) and managed to get to deeper waters avoiding detection. Note you are completely invisible if you are submerged, scopes down and stop. So if any warship would come close i would stop and wait till it passed me. doing this is rasoably easy undetected but i dont think i'll go to any shallow water port soon. I sank 20 000 tons while in the port but was not time efficient (specially in real life time) as you need to micro play your way out.

Steel_Tomb 06-16-07 11:31 AM

Its very hard in anything bigger than a type II uboat, but is possible. I got caught by a DD raiding a harbour in very shallow waters, got DC'd once or twice and did take some damage but if you do the wiggle waggle you can eventually get out of its grip. I think I was lucky but stick at it and keep you wits about you and it is possible.

Btw does the tactic of "playing dead" on the seabed actually work in GWX? IIRC the last time I tried it they dropped DC's right on my head resulting in instant death!

Note: I did this at the start of the war in '39, all I can say is RIP if you try this any later than 1940 lol

Sebbe02 06-16-07 12:10 PM

Mentat, relax man!:doh:

I was just suggesting an idea. I wasn't sure if I ever tried it myself, sure have played with the tought, but I don't know if I ever tried it.

The other tactic works for sure, that I am certain.

minute 06-16-07 02:16 PM

Quote:

Originally Posted by MENTAT
if anyone was able to hit a destroyer within 300m sweeping all around you drawing circles all the time with hi speed... please respond. cause i have never managed nor winessed such a thing!

Within 300m no, torpedo will not arm. But it's possible to a swing around a DD and get a shoot from about 350m. Let the DD run a perpendicular pass above you somewhere at 50-60m depth. As soon as it releases depthcharges go flank speed, turn full rudder towards its path and order periscope depth. By the time you go up to 20m the sub starts levelling - raise the scope and turn engines full back - this will give you better separation from the DD to get more than 300m. Remember to switch rudder when going backwards. The DD will appear at about 60degrees offset, and torpedo heading almost head on. I don't think it's feasible to get a shot without automatic targeting - never been able to do it manually. Remember to set torpedo to fast, 0.5m running depth and open the tube before firing, you have about 3 to 5 seconds to get your shot.

IrischKapitan 06-17-07 06:56 AM

Ive raided Scapa Flow a couple of times in '39 (found an aux. cruiser there :rock:)
and found a really easy way of escaping DDs is to stick really close to the coast and when the DD lines up for a DC attack, theres a good chance that they will run aground.

Bring up the scope and ready stern tube and one less DD on you. Havnt tried this in 40-41 though. I now have over 70,000 GRT to my name and its only November '39

johnno74 06-17-07 07:59 AM

Quote:

Originally Posted by jimbuna
Sitting on the bottom does not afford you any advantage :nope:
Once/if detected your best chance is staying on the move :yep:

This is realistic. Active sonar (known as ASDIC in WW2) works because sound waves tend to be reflected when they hit something with a different density - the larger the density change, the stronger the reflection.

So yes, the sonar reflects off the seafloor - but the density change going between the sea and the seafloor is much smaller than the density change between your u-boats pressure hull and the air inside it.

This means your u-boat acts amost like a mirror for active sonar - while the return from the seafloor isn't nearly as strong.

Sitting on the bottom will reduce the noise produced by your sub as there are no motors, propellors or pumps running, making you almost impossible to pick up on passive sonar (hydrophones), but makes no difference at all to active sonar.

tcorken 06-17-07 12:43 PM

In particularly shallow water I've often evaded being sunk because the DDs almost blow their sterns off with their own depth charges. I believe they have set the timing much too early and soon enough the DC sailors are flying through the air on their way to heaven :) If they survive, they continue to drop non existant DCs and the DD is pretty harmless after that. They still have to be shaken off though in order to surface. BTW this is with GWX.

MENTAT 06-18-07 03:38 AM

Quote:

Originally Posted by johnno74
So yes, the sonar reflects off the seafloor - but the density change going between the sea and the seafloor is much smaller than the density change between your u-boats pressure hull and the air inside it.

This means your u-boat acts amost like a mirror for active sonar - while the return from the seafloor isn't nearly as strong.

Hmm, so boats sitting on seabed and evading DD's successfully in the movies are total crap then?


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