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WilhelmSchulz.-
10-05-2005, 03:00 PM
I get a radar contact and it turns out to be a C class DD. I go to 14m and wait in silince. All stop and a stern shot(wanted to use a electric torp) All of a sudun(I know it wrong) it starts pining me. I doged the first DC run(I stayed where I was) and came up to blow his *** out of the water. He gets me at P depth and destroyes my batt. and gives me floding. I sank the son of a ***** but I had to head home.
But I just want to know, HOW THE HELL DID HE FIND ME!???

WilhelmSchulz.-
10-05-2005, 03:00 PM
I get a radar contact and it turns out to be a C class DD. I go to 14m and wait in silince. All stop and a stern shot(wanted to use a electric torp) All of a sudun(I know it wrong) it starts pining me. I doged the first DC run(I stayed where I was) and came up to blow his *** out of the water. He gets me at P depth and destroyes my batt. and gives me floding. I sank the son of a ***** but I had to head home.
But I just want to know, HOW THE HELL DID HE FIND ME!???

jooo9
10-05-2005, 03:05 PM
Could he have detected your radar?

W.Irving
10-05-2005, 03:21 PM
Spotted your periscope?
In real life, the ASDIC operators used to sweep the sea now and then. You could've just been unlucky. http://forums.ubi.com/groupee_common/emoticons/icon_smile.gif

Gunnersman
10-05-2005, 03:28 PM
He saw your....


bad spelling!



ITS A JOKE MAN! http://forums.ubi.com/images/smilies/16x16_smiley-wink.gif

Thats why we love ya. http://forums.ubi.com/images/smilies/16x16_smiley-happy.gif

WilhelmSchulz.-
10-05-2005, 03:30 PM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by jooo9:
Could he have detected your radar? </div></BLOCKQUOTE>No I was submerged. And I dont think he spotted my perascope. It was in between waves.

RosenbauU73
10-05-2005, 04:24 PM
Hi
Once I found a big convoy more than 20 ships I was about 8000m away so I get its course and sat there for some time silent run periscope up no more than 15sec for check and when the lead destroyer came near me Iwas not with the periscope up and the ****** starts to also ping me and I also dont know how in hell he find me http://forums.ubi.com/images/smilies/51.gif and them the fun begins when the rest of the DD´s (4) join the party and sunk me after 1h or more(real) http://forums.ubi.com/images/smilies/cry.gif

lecek
10-05-2005, 04:58 PM
The hydrophones on the destroyer are always listening.

He can hear you. The later in the war the better the chance that he will hear you. I once had a DD start pinging me while I was silent (but running at 3 kts) and down to 100 - 110 meters in 1943.

jooo9
10-05-2005, 05:07 PM
I find that if they start to get really really close, you should shut off your engines so that you make almost no noise whatsoever.

cuthy2k
10-05-2005, 06:39 PM
Perhaps he saw your conning tower pop out of the water? seems unlikely but even in a slight swell it can appear above the waves...very uncool.

Or maybe the Sonar operator simply thought 'Hmmmm.... i havent pressed the Active Sonar button in a while...' and he found you http://forums.ubi.com/images/smilies/blink.gif

Seems like bad luck if you ask me.

W.Irving
10-06-2005, 01:23 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by lecek:
The hydrophones on the destroyer are always listening. </div></BLOCKQUOTE>

Yeah, but Wilhelm was running on silent just below the surface, so they would've had a hard time hearing him.
Either they did, and immediately swiftched on the ASDIC - or they didn't hear him and decided to sweep with ASDIC anyway.

blastomatic1759
10-06-2005, 02:00 AM
ah youve got the gramaphone turned up to loud

WilhelmSchulz.-
10-06-2005, 04:06 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by cuthy2k:
Perhaps he saw your conning tower pop out of the water? seems unlikely but even in a slight swell it can appear above the waves...very uncool. </div></BLOCKQUOTE>No. Sea was calm as glass. And I dont got sonar.

fizilbert
10-06-2005, 05:56 AM
Running silent does not mean you're invisilbe to them. It just means you've reduced your sound profile, not eliminated it. Also, you state "all stop and a stern shot." Did you actually fire on the destroyer? If so, perhaps he heard the torpedo?

mbabbs
10-06-2005, 06:03 AM
One of either of these

1: He spotted you diving
2: He spotted your periscope
3: Your bridge broke the surface.

I think its probably 1. I have noticed something very similar. I dived at around 3500 meters from a DD while approaching a convoy. He didn't speed up in the slightest and fortunately I kept an eye on him (with very brief looks) because slowly he changed course and headed directly in my direction. At first I thought that he was just performing a search pattern and would turn again, but no. He came directly to my position at medium speed and then started pinging. I put it down to him spotting me as I was diving.

zuluDROOG
10-06-2005, 06:17 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by WilhelmSchulz.-:
And I dont think he spotted my perascope. It was in between waves. </div></BLOCKQUOTE>
Hehehe... how do I attach these camouflage waves to my periscope? http://forums.ubi.com/images/smilies/16x16_smiley-wink.gif

RosenbauU73
10-06-2005, 07:02 AM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by jooo9:
I find that if they start to get really really close, you should shut off your engines so that you make almost no noise whatsoever. </div></BLOCKQUOTE>
Hi
Even with all stop(engine stop and silent run) they can find you http://forums.ubi.com/images/smilies/51.gif waht I think is that they sweep time to time the ASDIC like the crazy ivan in the russions subs.

WilhelmSchulz.-
10-06-2005, 12:50 PM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by mbabbs:
One of either of these

1: He spotted you diving
2: He spotted your periscope
3: Your bridge broke the surface. </div></BLOCKQUOTE> No my reansons.
1: I dived on radar contact(witch wasint long befor a visual contact was made)
2: I hade mu scope bearly breaking the surface.
3: The sea was calm (I could of made 22 kts. on the surface) and I was at 14.5m

Bubblehead1948
10-06-2005, 01:02 PM
http://forums.ubi.com/images/smilies/16x16_smiley-indifferent.gif He doesn't see you, but you're lying still at 14m. If the asdic operator is on station and his equipt is functioning; there is no reason he should not get a sound reflection from a 700 ton cigar shaped steel lump at 14m in the middle of the ocean that has no business being there.

Having arrived at that stage, it is not surprising that said asdic operator gets curious enough to mention it to the bridge.

Honestly, its not that complicated.

lecek
10-06-2005, 01:04 PM
As stated, silent running isn't silent.

It is just not very loud.

If a destroyer gets close to you, he might hear you. Period. By the time you hear the ASDIC, you know he already knows you are there.

The greater the destroyer skill the greater the chance he will hear you.

Now you said the water was calm. Guess what, that is a bonus for him. If the wind was 15 meters per second, then I doubt he would have heard you. Even worse in rain.

You don't say in your original message, but I bet he was passing close. 500 meters or less. Am I right?

The_Silent_O
10-06-2005, 01:04 PM
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by WilhelmSchulz.-:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by mbabbs:
One of either of these

1: He spotted you diving
2: He spotted your periscope
3: Your bridge broke the surface. </div></BLOCKQUOTE> No my reansons.
1: I dived on radar contact(witch wasint long befor a visual contact was made)
2: I hade mu scope bearly breaking the surface.
3: The sea was calm (I could of made 22 kts. on the surface) and I was at 14.5m </div></BLOCKQUOTE>

He found you during a sonar (ASDIC) sweep...

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> The search pattern
During screening operations the ASDIC operator searched through an arc of roughly 45 degrees each side of the base course of the vessel. The ASDIC had to be stopped at regular intervals on this arc long enough to allow the relatively slow underwater sound waves to return should they locate a submerged target. Normally the head would be stopped on a bearing and a sound pulse would be transmitted, which would be heard as a "ping" noise. If no echo was received after several seconds the head would be rotated a few degrees (usually 5) and the process repeated throughout the watch.
If the outgoing impulse stuck a submerged target the echo would be heard as a distinct "beep". If this occurred the ASDIC operator would sound the alarm, feed the range and bearing to the bridge and then immediately start left and right cuts to try to determine the width of the target and trying to see if it was moving from one side to another. He could also determine if the target was closing or opening the range.

Echoes would bounce back from many things besides the U-boats such as whales, schools of fish, vertical sea currents and ship's wakes. This caused many false alarms, especially with the inexperienced operators. The veteran operator was much better at figuring out these bad signals and hunting down the intended target. The commanding officers quickly learned which operators were reliable.

Another problem was that often a real U-boat could not be detected due to water conditions. ASDIC was not very reliable in rough water, nor when layers of different temperature deflected the sound waves. U-boats could dive beneath such layers to avoid detection. Modern submarines use this tactic to this day.


</div></BLOCKQUOTE>
From Uboat.net
http://www.uboat.net/allies/technical/asdic.htm

After about 1942 or so the destroyers will actively sweep the areas around the convoys. Hiding just below the surface is not an option anymore, You have to go deep then come up in the convoy OR take a long shot from outside the escort ring. Basically, move or die!

If you read Blair's books, he relates how many destroyers would go after objects under water. The end result would most likely be Bdu not hearing anything more from the U-boat.