Depth keeping mod?

prowler3 · 11-15-11, 03:51 PM

After posting this thread a couple of synapses fired off

and I remembered that the "crash dive" function may hurt your depth keeping abilities. I had commanded a crash dive AND changed the depth from 70m to 200m. Not sure if the crash dive itself or the depth change from default 70m caused the depth holding problems. Either way, I replayed the convoy attack and did not use the crash dive function. Instead, I commanded Flank speed and set depth at 200m...and had no problem maintaining 200m at 2 knots and silent running. I also noticed that the escorts had a much harder time "seeing" me at 2 knots compared to 2 knots after a crash dive initiation? Not sure why but I'll not be using the crash dive function again!

PappyCain · 11-15-11, 04:09 PM

I have no idea if this is "realism"...could a sub not run Silent Running AND maintain depth.

You are basically shutting down your pumps when you run silent effectively decreasing your neutral bouyancy trim as you fill the bilge with water leaks. I keep an eye on that and if I have to run the pumps, I do!

PappyCain · 11-15-11, 07:43 PM

Oh! let me add this. The sim is wonderfully modeled in that yes you can hold trim (atitude) as you run a few knots at silent running BUT water will still be accumulating in the bilge and you will have to keep your bow planes angling to keep from losing desired depth-station keeping .. or you may have to blow ballast tanks to purge the sea water which is not good as the surface ships look for that. So! be watchful when you go near crush depth because you can lose your boat when the pumps are not working and you have too much sea water accumulating in the bilge weighing you down. If you have a damaged hull, or the worse! You may not be able to get out of it even at full throttle nose up. You will slide back into the abyss and implode.

K-61 · 11-16-11, 11:11 AM

Does SH3 actually model bilge water accumulation? I've never seen anything in the documentation that says it does. In the old "Aces of the Deep" you would be prompted by your engineer to turn on the pumps.

Kapt Z · 11-16-11, 11:39 AM

Quote:

Originally Posted by K-61

Does SH3 actually model bilge water accumulation? I've never seen anything in the documentation that says it does. In the old "Aces of the Deep" you would be prompted by your engineer to turn on the pumps.

Wondering about that as well.

I can't recall ever having problems maintaining depth control at 'silent' speed(ie silent running set and rpms under 100) unless I had already taken damage or was suffering the 'crash dive bug'. Never as far down as 250m though.

PappyCain · 11-16-11, 02:18 PM

Perhaps I was too immersed in my immersion? Perhaps I had some hull damage? but the best way to know is run a deep drill near crush depth and gather data. In RL I know that is an issue and in game I have experienced exactly what I suggested on at least 2 patrols. The precise conditions I cannot recall and I am not a computer programmer LOL. I run RL commercial submersible ops! Keep us posted fellas and I will immerse myself in my glug glug fantasy world! LOL I love this sim!!

PS: I have not read in the documentation either but your boat will drift in current / wind when shut down and will not hold course if you do not plot it and just use the compass - so my imagination sez she is being 'set' * by wind and waves ... (nautical term as in being carried or offset by current or wind). I have run on multi-million dollar simulators where wind and waves will cause nav issues. I believe that the brilliant programmers may have it in their script ... somewhere.

Sailor Steve · 11-16-11, 02:49 PM

Quote:

Originally Posted by PappyCain

PS: I have not read in the documentation either but your boat will drift in current / wind when shut down

As far as I know this does not happen in the game. The wind will show a bearing when you ask for a weather report, but the smoke will always blow in the same direction and your sub will not drift at all.

Quote:

and will not hold course if you do not plot it and just use the compass - so my imagination sez she is being 'set' * by wind and waves ... (nautical term as in being carried or offset by current or wind).

True, but completely wrong. In real life the helmsman will keep the heading you give him, but the boat will drift off course. This isn't usually major in over short distances, but if you're under cloudy weather for a week or more you can find yourself far from where you thought.

In the game the helmsman is an idiot and will let the boat steer itself where it wants to. If you set a heading of 315 and then go to time compression you'll see the compass drift all over the place, sometimes as far as reversing your course. Competely unrealistic.

11-15-11, 04:09 PM	#2
PappyCain Samurai Navy Join Date: Aug 2008 Location: on the Atlantic Ocean Posts: 559 Downloads: 10 Uploads: 0	I have no idea if this is "realism"...could a sub not run Silent Running AND maintain depth. You are basically shutting down your pumps when you run silent effectively decreasing your neutral bouyancy trim as you fill the bilge with water leaks. I keep an eye on that and if I have to run the pumps, I do! __________________ DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol: http://www.uboat.net/today.html

11-15-11, 07:43 PM	#3
PappyCain Samurai Navy Join Date: Aug 2008 Location: on the Atlantic Ocean Posts: 559 Downloads: 10 Uploads: 0	Oh! let me add this. The sim is wonderfully modeled in that yes you can hold trim (atitude) as you run a few knots at silent running BUT water will still be accumulating in the bilge and you will have to keep your bow planes angling to keep from losing desired depth-station keeping .. or you may have to blow ballast tanks to purge the sea water which is not good as the surface ships look for that. So! be watchful when you go near crush depth because you can lose your boat when the pumps are not working and you have too much sea water accumulating in the bilge weighing you down. If you have a damaged hull, or the worse! You may not be able to get out of it even at full throttle nose up. You will slide back into the abyss and implode. __________________ DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol: http://www.uboat.net/today.html

11-16-11, 11:11 AM	#4
K-61 Grey Wolf Join Date: Nov 2005 Location: Ontario Posts: 795 Downloads: 39 Uploads: 0	Does SH3 actually model bilge water accumulation? I've never seen anything in the documentation that says it does. In the old "Aces of the Deep" you would be prompted by your engineer to turn on the pumps. __________________

11-16-11, 02:18 PM	#6
PappyCain Samurai Navy Join Date: Aug 2008 Location: on the Atlantic Ocean Posts: 559 Downloads: 10 Uploads: 0	Perhaps I was too immersed in my immersion? Perhaps I had some hull damage? but the best way to know is run a deep drill near crush depth and gather data. In RL I know that is an issue and in game I have experienced exactly what I suggested on at least 2 patrols. The precise conditions I cannot recall and I am not a computer programmer LOL. I run RL commercial submersible ops! Keep us posted fellas and I will immerse myself in my glug glug fantasy world! LOL I love this sim!! PS: I have not read in the documentation either but your boat will drift in current / wind when shut down and will not hold course if you do not plot it and just use the compass - so my imagination sez she is being 'set' * by wind and waves ... (nautical term as in being carried or offset by current or wind). I have run on multi-million dollar simulators where wind and waves will cause nav issues. I believe that the brilliant programmers may have it in their script ... somewhere. __________________ DID, no cheats, no shortcuts, no non-historic equipment deviations. Boat and crew safety is integral with my immersion style! Follow the historic events during your patrol: http://www.uboat.net/today.html

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

11-15-11, 03:51 PM	#1
prowler3 XO Join Date: Mar 2007 Location: Colorado, for now. Any RED State, ASAP. Posts: 401 Downloads: 77 Uploads: 0	After posting this thread a couple of synapses fired off and I remembered that the "crash dive" function may hurt your depth keeping abilities. I had commanded a crash dive AND changed the depth from 70m to 200m. Not sure if the crash dive itself or the depth change from default 70m caused the depth holding problems. Either way, I replayed the convoy attack and did not use the crash dive function. Instead, I commanded Flank speed and set depth at 200m...and had no problem maintaining 200m at 2 knots and silent running. I also noticed that the escorts had a much harder time "seeing" me at 2 knots compared to 2 knots after a crash dive initiation? Not sure why but I'll not be using the crash dive function again!