Hydrophone Question

Segwin · 07-03-08, 05:21 AM

While on patrol yesterday we picked up a slow moving contact. I went to the hydrophone to listen but there was no sound. The freighter was doing about three knots. This has happened a few times as of late.

Can the hydrophone pickup a slow moving contact or is something gone sour with the install?

TMO & RSRD V.1.5

LeeVanSpliff · 07-03-08, 05:39 AM

Were you submerged when listening? Also, do you have realistic sensor thingie enabled?

Segwin · 07-03-08, 05:57 AM

Quote:

Originally Posted by LeeVanSpliff

Were you submerged when listening? Also, do you have realistic sensor thingie enabled?

Yes and yes.

LeeVanSpliff · 07-03-08, 07:45 AM

Hmm. Maybe the range at which you can make out a slow moving contact also diminishes with realistic sensors? Been thinking about it myself, and from what I've gathered (and I might very well be wrong) slow ships make nearly the same noise as they do when going at higher speed, just less frequent. At least I can't tell the difference from a freighter going steadily at 8 knots to going about 10 in vain hopes of escape after I blow up his buddy on how loud the propeller sound is.

wetwarev7 · 07-03-08, 11:48 AM

Three knots is pretty slow. I would think that it is realistic for the faster a ship goes, the further away you could hear it. Part of 'running silent' is slowing the sub down so the props don't cavitate and whatnot, so I would think the same applies to surface ships. Going at a slow speed would also lessen the noise of the waves hitting the ships prow as well.

Now the question is, is it realistic for a merchant vessel to be traveling that slowly in sub infested waters? :hmm:

Schroeder · 07-03-08, 12:31 PM

I have this bug quite frequently. I dive to periscopedepth and don't hear a thing even though the freighter is close to my (the AI sonarguy can be tricked into following it though, just tell him to do a normal sweep and then order him to report contacts)

I'm using 1.4 with RFB.

aanker · 07-03-08, 07:20 PM

Quote:

Originally Posted by Segwin

While on patrol yesterday we picked up a slow moving contact. I went to the hydrophone to listen but there was no sound. The freighter was doing about three knots. This has happened a few times as of late.

Can the hydrophone pickup a slow moving contact or is something gone sour with the install?

TMO & RSRD V.1.5

Quote:

Originally Posted by Segwin

Quote:

Originally Posted by LeeVanSpliff

Were you submerged when listening? Also, do you have realistic sensor thingie enabled?

Yes and yes.

I think less than 5 kts they are harder to pick up. I followed a US Maru at Midway while at periscope depth within 2,000 yds and couldn't hear him moving at 5 kts and intially thought there was a problem with my sonar until I heard others moving faster with no problem.

I guess that's good news for us while evading the ASW.

Happy Hunting!

Art

07-03-08, 05:21 AM	#1
Segwin Planesman Join Date: Jun 2005 Location: Ohio Posts: 187 Downloads: 127 Uploads: 0	Hydrophone Question While on patrol yesterday we picked up a slow moving contact. I went to the hydrophone to listen but there was no sound. The freighter was doing about three knots. This has happened a few times as of late. Can the hydrophone pickup a slow moving contact or is something gone sour with the install? TMO & RSRD V.1.5

07-03-08, 05:39 AM	#2
LeeVanSpliff Machinist's Mate Join Date: Jun 2008 Posts: 127 Downloads: 1 Uploads: 0	Were you submerged when listening? Also, do you have realistic sensor thingie enabled? __________________ "I'll rant as well as thou." Hamlet, Act 5, Scene 1

07-03-08, 07:45 AM	#4
LeeVanSpliff Machinist's Mate Join Date: Jun 2008 Posts: 127 Downloads: 1 Uploads: 0	Hmm. Maybe the range at which you can make out a slow moving contact also diminishes with realistic sensors? Been thinking about it myself, and from what I've gathered (and I might very well be wrong) slow ships make nearly the same noise as they do when going at higher speed, just less frequent. At least I can't tell the difference from a freighter going steadily at 8 knots to going about 10 in vain hopes of escape after I blow up his buddy on how loud the propeller sound is. __________________ "I'll rant as well as thou." Hamlet, Act 5, Scene 1

07-03-08, 11:48 AM	#5
wetwarev7 Grey Wolf Join Date: Oct 2005 Location: Deep Waters Posts: 871 Downloads: 31 Uploads: 0	Three knots is pretty slow. I would think that it is realistic for the faster a ship goes, the further away you could hear it. Part of 'running silent' is slowing the sub down so the props don't cavitate and whatnot, so I would think the same applies to surface ships. Going at a slow speed would also lessen the noise of the waves hitting the ships prow as well. Now the question is, is it realistic for a merchant vessel to be traveling that slowly in sub infested waters? :hmm: __________________ Guess I should change my sig since SH5 has an offline mode now

07-03-08, 12:31 PM	#6
Schroeder Navy Seal Join Date: Apr 2008 Location: Banana Republic of Germany Posts: 6,170 Downloads: 62 Uploads: 0	I have this bug quite frequently. I dive to periscopedepth and don't hear a thing even though the freighter is close to my (the AI sonarguy can be tricked into following it though, just tell him to do a normal sweep and then order him to report contacts) I'm using 1.4 with RFB.