Passive Torpedo Problems

Soundman · 07-10-06, 04:58 PM

I'm hoping someone can help me here. I have launched many passive MK-48s in passive mode and not one will hit a target. So I tried an experiment with truth turned on and wire guided the thing directly to the target and nothing. And yes, the fish were enabled. I have even guided the torpedo and watched a torpedo go directly through a submarine. I first thought maybe a problem with a patch or a bad install perhaps. Re-installed and the same thing happens. Hmmm?.....O.K......Re-installed with no patches.....same thing. I even went as far as thinking it was an "XP PRo" thing..Nope, I tried it on my old computer....Same thing.....Oddly enough, I even re-installed Sub Command and even it does it too...I must be overlooking something terribly simple here. My active fish hit nearly every time. I use the same procedures with actives as passives except I uncheck the box. (to select passive mode). Any Suggestions? Thanks!

JamesT73J · 07-10-06, 05:15 PM

Speed. I can't remember what the threshold is (never use the things), but you can't run them at full speed -they won't hear anything.

Soundman · 07-10-06, 05:23 PM

I'll give that a try. Thanks for posting!

Molon Labe · 07-10-06, 05:27 PM

45 knots is usually low enough in the stock game, although there might still be partial washout at that speed.

Soundman · 07-10-06, 05:33 PM

Ah, Success! Yep, you guys were right on. I set the fish at 40kts and KABOOM. Thanks much! I figured it must be something simple. Never had to do that with Janes 688I.

Soundman

SeaQueen · 07-10-06, 08:36 PM

Sort of a related question...

Has anyone noticed if torpedoes are more quiet when you shoot them at less than full speed?

Fish · 07-11-06, 04:17 AM

Quote:

Originally Posted by SeaQueen

Sort of a related question...

Has anyone noticed if torpedoes are more quiet when you shoot them at less than full speed?

I launched a torp at 35 and a litle later one at 55, when they are equal at range I saw no different .
I used the LWAMI mod.

LuftWolf · 07-11-06, 07:33 PM

In the stock game, there is no difference in sound vs. speed other than cavitation (+10PSL or about 15dB).

In LWAMI torpedoes have an addtional +10PSL when traveling at full speed, scaled linearly down to +0 at 0 kts, as well as the +10PSL when cavitating.

Cheers,
David

Phullbrick · 07-12-06, 05:56 AM

any idea of the best speed to use for a passive torpedo to reduce the washout effect on the torpedo sensor ?

Amizaur · 07-12-06, 01:01 PM

In game currently - under 46kts. But I don't like this value and it should be lowered. Realistically - 40kts or below for passives.

Fish · 07-12-06, 04:07 PM

Quote:

Originally Posted by LuftWolf

In the stock game, there is no difference in sound vs. speed other than cavitation (+10PSL or about 15dB).

In LWAMI torpedoes have an addtional +10PSL when traveling at full speed, scaled linearly down to +0 at 0 kts, as well as the +10PSL when cavitating.

Cheers,
David

LW, I wonder it should be liniar? Just a feeling but shouldn't the noise not rapidly increase at higher speed?

Qppralke · 07-12-06, 10:31 PM

BTW. I remember you could launch torpedo , deep enough to not cause "Torpedo in the Water" on other players boat. Anyone remember how deep it has to be ?

LuftWolf · 07-13-06, 01:04 AM

Quote:

Originally Posted by Fish

Quote:

Originally Posted by LuftWolf

In the stock game, there is no difference in sound vs. speed other than cavitation (+10PSL or about 15dB).

In LWAMI torpedoes have an addtional +10PSL when traveling at full speed, scaled linearly down to +0 at 0 kts, as well as the +10PSL when cavitating.

Cheers,
David

LW, I wonder it should be liniar? Just a feeling but shouldn't the noise not rapidly increase at higher speed?

Well, that's the way it has to be done because of the way the engine works. We have taken care to calculate the base PSL values accordingly.

It's really not THAT big a deal, because the cavitation profiles for the torpedoes are good enough that slow torpedoes make much less noise than fast torpedoes because they don't cavitate except if at very shallow depths.

So, for all practical purposes, in terms of in game performance, it is exactly as you describe, Fish.

Cheers,
David

Nexus7 · 07-15-06, 02:10 AM

Quote:

Originally Posted by LuftWolf

In the stock game, there is no difference in sound vs. speed other than cavitation (+10PSL or about 15dB).

That applies only for torpedoes right? Because for the subs i notice signal strength changes when a Seawolf makes i.e. 3 knots, 8 knots or 15 knots. I am using the stock game

Qppralke · 07-15-06, 02:20 AM

Is it really dependant on the layer ?
Goldorak , yes you are right . . . do you remember how deep it is ?

07-10-06, 04:58 PM	#1
Soundman Commodore Join Date: Jul 2006 Location: Orlando, Fl Posts: 617 Downloads: 60 Uploads: 0	Passive Torpedo Problems I'm hoping someone can help me here. I have launched many passive MK-48s in passive mode and not one will hit a target. So I tried an experiment with truth turned on and wire guided the thing directly to the target and nothing. And yes, the fish were enabled. I have even guided the torpedo and watched a torpedo go directly through a submarine. I first thought maybe a problem with a patch or a bad install perhaps. Re-installed and the same thing happens. Hmmm?.....O.K......Re-installed with no patches.....same thing. I even went as far as thinking it was an "XP PRo" thing..Nope, I tried it on my old computer....Same thing.....Oddly enough, I even re-installed Sub Command and even it does it too...I must be overlooking something terribly simple here. My active fish hit nearly every time. I use the same procedures with actives as passives except I uncheck the box. (to select passive mode). Any Suggestions? Thanks!

07-10-06, 05:27 PM	#4
Molon Labe Silent Hunter Join Date: Jun 2004 Location: Along the Watchtower Posts: 3,810 Downloads: 27 Uploads: 5	45 knots is usually low enough in the stock game, although there might still be partial washout at that speed. __________________

07-11-06, 07:33 PM	#8
LuftWolf Ocean Warrior Join Date: May 2005 Location: Free New York Posts: 3,167 Downloads: 2 Uploads: 0	In the stock game, there is no difference in sound vs. speed other than cavitation (+10PSL or about 15dB). In LWAMI torpedoes have an addtional +10PSL when traveling at full speed, scaled linearly down to +0 at 0 kts, as well as the +10PSL when cavitating. Cheers, David __________________ LW

07-12-06, 05:56 AM	#9
Phullbrick Seaman Join Date: Mar 2002 Location: France Posts: 42 Downloads: 9 Uploads: 0	any idea of the best speed to use for a passive torpedo to reduce the washout effect on the torpedo sensor ? __________________

07-12-06, 10:31 PM	#12
Qppralke A-ganger Join Date: Jan 2002 Location: from Poland , in Wales . . Posts: 72 Downloads: 0 Uploads: 0	BTW. I remember you could launch torpedo , deep enough to not cause "Torpedo in the Water" on other players boat. Anyone remember how deep it has to be ? __________________ Last edited by Qppralke; 07-12-06 at 10:35 PM.

07-10-06, 05:15 PM	#2
JamesT73J Medic Join Date: Jan 2002 Location: United Kingdom Posts: 167 Downloads: 9 Uploads: 0	Speed. I can't remember what the threshold is (never use the things), but you can't run them at full speed -they won't hear anything.

07-10-06, 05:23 PM	#3
Soundman Commodore Join Date: Jul 2006 Location: Orlando, Fl Posts: 617 Downloads: 60 Uploads: 0	I'll give that a try. Thanks for posting!

07-10-06, 05:33 PM	#5
Soundman Commodore Join Date: Jul 2006 Location: Orlando, Fl Posts: 617 Downloads: 60 Uploads: 0	Ah, Success! Yep, you guys were right on. I set the fish at 40kts and KABOOM. Thanks much! I figured it must be something simple. Never had to do that with Janes 688I. Soundman

07-10-06, 08:36 PM	#6
SeaQueen Naval Royalty Join Date: Jun 2005 Location: Washington, DC Posts: 1,185 Downloads: 0 Uploads: 0	Sort of a related question... Has anyone noticed if torpedoes are more quiet when you shoot them at less than full speed?

07-12-06, 01:01 PM	#10
Amizaur Sonar Guy Join Date: Nov 2002 Location: Poland Posts: 398 Downloads: 0 Uploads: 0	In game currently - under 46kts. But I don't like this value and it should be lowered. Realistically - 40kts or below for passives.

07-15-06, 02:20 AM	#15
Qppralke A-ganger Join Date: Jan 2002 Location: from Poland , in Wales . . Posts: 72 Downloads: 0 Uploads: 0	Is it really dependant on the layer ? Goldorak , yes you are right . . . do you remember how deep it is ? __________________