Speed and quiet - 1/3 vs 2/3 vs full stop

Julhelm · 07-20-17, 06:46 PM

It really depends on what the enemies are doing, what sensors they have, if you're in a duct, if there's a layer in between, etc. It is quite possible to stalk enemies up to 20kts if the variables are in your favor. Use the signature analysis to determine this. If engaging surface ships, observe their sprint and drift behavior, then use that to your advantage. Being stealthy does not necessarily mean being slow.

PurpleCow · 07-20-17, 06:56 PM

Quote:

Originally Posted by Julhelm

... Use the signature analysis to determine this.

Thanks!. I was about to ask you to talk further about signature analysis but I did some searching and found this nice video from JiveTurkey that covers it. Nice explanation JiveTurkey!

FPSchazly · 07-20-17, 07:00 PM

Here's a nice tutorial from my buddy ramjb on why being stealthy doesn't mean you have to be slow.

Raptor_Pilot · 07-22-17, 03:20 PM

Quote:

Originally Posted by Julhelm

Being stealthy does not necessarily mean being slow.

This is a lesson I am forced to re-learn, time, after time, after time.

Shadow · 07-22-17, 03:52 PM

Basically, you've to use the Signature Analysis panel to gauge just how detectable you are versus a specific contact. As long as you're not over 10 dB on any enemy sensor at a given speed, you should be safe.

However, it's a gamble to run above 2/3 speed unless you're more or less certain the enemy won't be detecting you (i.e. you're in their baffles), considering the faster you go, the deafer you are. That can make you lose contacts and prevent you from noticing (and adapting to) changing circumstances. Which can very well happen given escorts and submarines occasionally change course and/or slow down to listen in where they couldn't earlier.

Another thing to consider is that you can't measure yourself against what you haven't detected, so again, caution is advised unless you're fairly sure every enemy is accounted for.

schurem · 07-23-17, 01:42 AM

Aren't Narwhal and the 688's the only boats that have natural convection reactors that don't need to actively pump their coolant when running slowly? Is it modelled that they make a big step in quieting when going 1/3rd?

Also Rickover was a dick lol.

Kazuaki Shimazaki II · 07-23-17, 05:19 AM

Quote:

Originally Posted by schurem

Aren't Narwhal and the 688's the only boats that have natural convection reactors that don't need to actively pump their coolant when running slowly? Is it modelled that they make a big step in quieting when going 1/3rd?

AFAIK, there's only one "kink" in the system right now, and that's an jump when you cavitate. Beyond that it is linear with speed.

Perhaps it'll be a good idea to change the text file format to allow for aknot by knot noise value which the game just looks-up. Then we can program in however many kinks we feel is realistic. Pumps on/off, pumps switching to high speed, another pump being brought into the game, the raft being locked on some subs at high speed ... etc.

The Bandit · 07-23-17, 05:48 AM

Quote:

Originally Posted by schurem

Aren't Narwhal and the 688's the only boats that have natural convection reactors that don't need to actively pump their coolant when running slowly? Is it modelled that they make a big step in quieting when going 1/3rd?

Also Rickover was a dick lol.

The 688s use an S6G reactor which isn't natural convection, you're probably thinking of the Ohio's S8G.

07-20-17, 07:00 PM	#3
FPSchazly Good Hunting! Join Date: Apr 2014 Location: Beantown Posts: 776 Downloads: 15 Uploads: 1	Here's a nice tutorial from my buddy ramjb on why being stealthy doesn't mean you have to be slow. __________________ Your friendly neighborhood modern submarine YouTuber. My videos: Exclusive Look at Modern Naval Warfare! Dangerous Waters Liu Doctrine (LwAmi Learn to play Dangerous Waters

07-22-17, 03:52 PM	#5
Shadow Torpedoman Join Date: Oct 2005 Location: Buenos Aires Posts: 112 Downloads: 10 Uploads: 2	Basically, you've to use the Signature Analysis panel to gauge just how detectable you are versus a specific contact. As long as you're not over 10 dB on any enemy sensor at a given speed, you should be safe. However, it's a gamble to run above 2/3 speed unless you're more or less certain the enemy won't be detecting you (i.e. you're in their baffles), considering the faster you go, the deafer you are. That can make you lose contacts and prevent you from noticing (and adapting to) changing circumstances. Which can very well happen given escorts and submarines occasionally change course and/or slow down to listen in where they couldn't earlier. Another thing to consider is that you can't measure yourself against what you haven't detected, so again, caution is advised unless you're fairly sure every enemy is accounted for. __________________ Shadow's Cold Waters mods (JSGME-friendly) = Longer Campaigns: Marathon Edition = 500-yard MAD range

07-20-17, 06:46 PM	#1
Julhelm Seasoned Skipper Join Date: Jul 2007 Location: The Icy North Posts: 693 Downloads: 189 Uploads: 0	It really depends on what the enemies are doing, what sensors they have, if you're in a duct, if there's a layer in between, etc. It is quite possible to stalk enemies up to 20kts if the variables are in your favor. Use the signature analysis to determine this. If engaging surface ships, observe their sprint and drift behavior, then use that to your advantage. Being stealthy does not necessarily mean being slow.

07-23-17, 01:42 AM	#6
schurem Loader Join Date: Jul 2003 Posts: 90 Downloads: 42 Uploads: 0	Aren't Narwhal and the 688's the only boats that have natural convection reactors that don't need to actively pump their coolant when running slowly? Is it modelled that they make a big step in quieting when going 1/3rd? Also Rickover was a dick lol.