Diving deep to avoid DDs

Aoogahman · 08-09-18, 12:49 PM

As it turned out, I used too many torpedoes to do it, but did manage to sink two freighters. It was sort of dark, I got spotted, and a few cannon shots came in my direction. So I guess the four escorts had a good idea where I was. At that point I did all the normal escape things: turned away from the convoy, dove deep (320 ft), rigged for silent running, set speed to AA 1/3 and set one knot on the speed log dial.

I did hear one depth charge go off early on, but it wasn't close. I just remained silent and deep and eventually the escorts returned to the convoy.

But... There was no active pinging involved as was your case. Had there been, I would have made sure to show as small a profile as possible, preferably a stern view, which I didn't see mentioned above. I think it's a big factor when active sonar is after you.

propbeanie · 08-09-18, 02:34 PM

Ahhh... but the game doesn't do "profile" the way you would think... there have been conflicting reports from the field - and it may not matter - or, (horrors

) it might be "reversed". Further CapnScurvy luh-bore-uh-tory testing is needed (ya can't get that "CSL Approved" sticker without it!)...

jimmbbo · 08-09-18, 10:44 PM

Dunno if this will help, and am unsure how you currently set up your attacks, but in the stock game, I have had success setting up at 1000-1500 yards 90 deg from the main target bearing line at depth, working to minimize exposure at the depths where they can hear me. (duh

)

starting out below the thermocline (usually 200-250 ft), I configure the torpedo settings and confirm silent running.
Beginning the ascent puts the crew on battle stations.
Pause at 150-160 feet (below most DD hearing) and survey the situation on the plotting board.
- Assuming no nearby "sidekick" DDs, when the lead DD passes past my 11-12:00, I start to ascend, watching the tracks of the targets, trying to get the main target ship at 40ish degrees ascending through 100 ft or so,
- the attack periscope is raised and set at the approximate target bearing.
Once at periscope depth, I acquire the target(s), track and fire. (If using the O'Kane method, that will be 10-12 degrees before the boat's 12:00)
As soon as the torpedoes are launched (as a rule, 3 for large ships, 2 for medium, one for small), I silently submerge toward 250 ft while moving ahead at 1 kt, determine which DD is likely to be a problem, and formulate a plan to avoid him.
As soon as I am safely below the thermocline, the speed can increase to 5 kt and zig zag evasive maneuvering begun to have the stern pointed to the nearest DD much of the time, using the zig zags to check progress.

Since this is in the stock game, YMMV with TMO.

Good hunting!!

mikesn9 · 08-10-18, 05:53 AM

Propbeanie: in your reply, you added a video, I looked to see what it was going to show.. but It's Credence Clearwater Revival..

Is that what you meant to send?

mikesn9 · 08-10-18, 06:08 AM

Thanks all,
I found the RPM Gauges, and got the info that game AI doesn't 'detect' the background noise, just the ship's RPM noise.
And, thanks to all the strategy clues, I have been doing most of them anyway, but it's always good to get reinforcement of what I'm doing.

CapnScurvy · 08-10-18, 07:27 AM

An overall understanding of detection is...…..there's MANY ways a sub will be detected!

1. Visual: Within the parameters of the game (modded or not), the sub can be detected by visual means within specific distances; specific time periods the sub is exposed; specific amounts of sub "size" actually exposed to the visual sensor. This can come from ANY enemy source......Plane; SanPan fishing boats; Land installations; etc.

2. Sonar: The same as Visual, but in different area of detection...….one is above the waterline; the other below the waterline.

3. Hydrophone: The subs noise level from its engine RPM value. Enabling Silent Running simply works as a "modifier" to a calculation of RPM, Distance, Depth, of the sub.

4. Messaging: You send a message/report to base...….detection occurs if an enemy is within a certain specified distance.

5. Firing a torpedo or deck gun shell.....no better way of telling the enemy where you are is by firing on him.

AND, with any of these initial processes, there are additional "modifiers" that come into play that can either "enhance" the detection capabilities, or "detract" from the calculation. Such as, how long the detection time period will be "active" before the enemy will go back to its non combative state; Or, how the environmental conditions play an effect on detection.

Lot's of ways to be detected!

08-09-18, 12:49 PM	#1
Aoogahman Seaman Join Date: Jul 2018 Location: Florida Posts: 31 Downloads: 1 Uploads: 0	As it turned out, I used too many torpedoes to do it, but did manage to sink two freighters. It was sort of dark, I got spotted, and a few cannon shots came in my direction. So I guess the four escorts had a good idea where I was. At that point I did all the normal escape things: turned away from the convoy, dove deep (320 ft), rigged for silent running, set speed to AA 1/3 and set one knot on the speed log dial. I did hear one depth charge go off early on, but it wasn't close. I just remained silent and deep and eventually the escorts returned to the convoy. But... There was no active pinging involved as was your case. Had there been, I would have made sure to show as small a profile as possible, preferably a stern view, which I didn't see mentioned above. I think it's a big factor when active sonar is after you. __________________ Now where did I put that clock key?

08-09-18, 02:34 PM	#2
propbeanie CTD - it's not just a job Join Date: May 2016 Location: One hour from Music City USA! Posts: 10,098 Downloads: 451 Uploads: 2	Ahhh... but the game doesn't do "profile" the way you would think... there have been conflicting reports from the field - and it may not matter - or, (horrors ) it might be "reversed". Further CapnScurvy luh-bore-uh-tory testing is needed (ya can't get that "CSL Approved" sticker without it!)... __________________ "...and bollocks to the naysayers" - Jimbuna

08-09-18, 10:44 PM	#3
jimmbbo Run silent, run deep Join Date: Jun 2016 Posts: 225 Downloads: 59 Uploads: 0	Dunno if this will help, and am unsure how you currently set up your attacks, but in the stock game, I have had success setting up at 1000-1500 yards 90 deg from the main target bearing line at depth, working to minimize exposure at the depths where they can hear me. (duh ) starting out below the thermocline (usually 200-250 ft), I configure the torpedo settings and confirm silent running. Beginning the ascent puts the crew on battle stations. Pause at 150-160 feet (below most DD hearing) and survey the situation on the plotting board. Assuming no nearby "sidekick" DDs, when the lead DD passes past my 11-12:00, I start to ascend, watching the tracks of the targets, trying to get the main target ship at 40ish degrees ascending through 100 ft or so, the attack periscope is raised and set at the approximate target bearing. Once at periscope depth, I acquire the target(s), track and fire. (If using the O'Kane method, that will be 10-12 degrees before the boat's 12:00) As soon as the torpedoes are launched (as a rule, 3 for large ships, 2 for medium, one for small), I silently submerge toward 250 ft while moving ahead at 1 kt, determine which DD is likely to be a problem, and formulate a plan to avoid him. As soon as I am safely below the thermocline, the speed can increase to 5 kt and zig zag evasive maneuvering begun to have the stern pointed to the nearest DD much of the time, using the zig zags to check progress. Since this is in the stock game, YMMV with TMO. Good hunting!!

08-10-18, 05:53 AM	#4
mikesn9 Sonar Guy Join Date: Feb 2013 Location: Sarasota Florida Posts: 391 Downloads: 68 Uploads: 0	Propbeanie: in your reply, you added a video, I looked to see what it was going to show.. but It's Credence Clearwater Revival.. Is that what you meant to send?

08-10-18, 06:08 AM	#5
mikesn9 Sonar Guy Join Date: Feb 2013 Location: Sarasota Florida Posts: 391 Downloads: 68 Uploads: 0	Thanks all, I found the RPM Gauges, and got the info that game AI doesn't 'detect' the background noise, just the ship's RPM noise. And, thanks to all the strategy clues, I have been doing most of them anyway, but it's always good to get reinforcement of what I'm doing.