Pinging from destroyers?

Sailor Steve · 02-26-08, 07:11 PM

It is audible, but probably not in the way the movies show it. I don't remember which one, but one German captain said it sounded like pebbles being thrown against the hull.

-Pv- · 02-26-08, 07:40 PM

I believe the early "ASDIC" type sonars were wide band and consisted of the "ping" we are familiar with. Later sonars used "chirps" pulses of several frequencies closer to the clicks we hear from dolphins which might sound more like the "pebble" effect. As the war progressed, different types of sonars were produced.
-Pv-

fireship4 · 02-27-08, 06:55 AM

Any way to make destroyers and the like constantly ping? From what I've heard thats what they did in the IJN. Then you could pick up a task force from their pings before you see them and before you can pick them up on sonar.

Is there volume variation in the game when the pinging ship is further away?

Lastly does anyone know if there were slow and fast ping rates in use by the IJN?

DavyJonesFootlocker · 02-27-08, 07:30 AM

As a rule I go as far as 300 ft depending on ocean depth. Turn off all torpedo loading and any repairing. Get below a thermal layer. I had 8 Subchasers and 2 DDs after me and about 3 hrs managed to elude them.

MarkShot · 02-27-08, 12:43 PM

A pinging platform pings at a faster rate the closer it gets. Why? It takes less time for the sound to travel back to the sender. So, the sender does not need to worry about overlapping sendings and receiving.

So, in games like DW/SC besides the volume of the ping, the frequency of the ping also indicates how close the sender is. The pace of pinging by a homing torp gets quicker and quicker until you are dead.

In these games, I have noticed variation in ping volume, but I think there is different sound played when they have you located.

In AOD/SHCE, pinging volume was modeled with distance. When they had you, you could clearly hear a different sound. With SHCE, you could hear a shift in the ping as crossed a thermal layer.

The Thorn · 02-27-08, 03:55 PM

What about the decoys? Does anybody use them to escape from enemy ships? I read that they are for distraction for sonar but I have not much succes with using them. Does anybody know how to use them in a good and effective way?

-Pv- · 02-27-08, 11:47 PM

I haven't used them but the typical technique is to use them to make a lof of noise while you change depth and direction at minimum noise so when the enemy figures they are following a false lead, you are in an unexpected location frustrating their search.
-Pv-

02-26-08, 07:11 PM	#1
Sailor Steve Eternal Patrol Join Date: Nov 2002 Location: High in the mountains of Utah Posts: 50,369 Downloads: 745 Uploads: 249	It is audible, but probably not in the way the movies show it. I don't remember which one, but one German captain said it sounded like pebbles being thrown against the hull. __________________ “Never do anything you can't take back.” —Rocky Russo

02-27-08, 06:55 AM	#3
fireship4 Ensign Join Date: Oct 2007 Location: United Kingdom Posts: 221 Downloads: 41 Uploads: 0	Any way to make destroyers and the like constantly ping? From what I've heard thats what they did in the IJN. Then you could pick up a task force from their pings before you see them and before you can pick them up on sonar. Is there volume variation in the game when the pinging ship is further away? Lastly does anyone know if there were slow and fast ping rates in use by the IJN? __________________ Rest in peace Dave

02-27-08, 07:30 AM	#4
DavyJonesFootlocker The Old Man Join Date: Dec 2007 Location: Stink Drunk in Trinidad Posts: 1,572 Downloads: 138 Uploads: 0	As a rule I go as far as 300 ft depending on ocean depth. Turn off all torpedo loading and any repairing. Get below a thermal layer. I had 8 Subchasers and 2 DDs after me and about 3 hrs managed to elude them. __________________ "Silence means death. Stand on your feet. Inner fear your worst enemy."- Sepultura. My Silent Hunter 5 mantra is this......"Torpedo missed, sir!" A P-400 is a P-40 with a Zero after it. A proud member of the Wikipedia Haters Club

02-27-08, 12:43 PM	#5
MarkShot Ace of the Deep Join Date: Jul 2002 Posts: 1,134 Downloads: 93 Uploads: 0	A pinging platform pings at a faster rate the closer it gets. Why? It takes less time for the sound to travel back to the sender. So, the sender does not need to worry about overlapping sendings and receiving. So, in games like DW/SC besides the volume of the ping, the frequency of the ping also indicates how close the sender is. The pace of pinging by a homing torp gets quicker and quicker until you are dead. In these games, I have noticed variation in ping volume, but I think there is different sound played when they have you located. In AOD/SHCE, pinging volume was modeled with distance. When they had you, you could clearly hear a different sound. With SHCE, you could hear a shift in the ping as crossed a thermal layer. __________________ War games, not wars! --- Only a small few profit from war (that should not stand)!

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02-26-08, 07:40 PM	#2
-Pv- The Old Man Join Date: Apr 2006 Posts: 1,434 Downloads: 5 Uploads: 0	I believe the early "ASDIC" type sonars were wide band and consisted of the "ping" we are familiar with. Later sonars used "chirps" pulses of several frequencies closer to the clicks we hear from dolphins which might sound more like the "pebble" effect. As the war progressed, different types of sonars were produced. -Pv-

02-27-08, 03:55 PM	#6
The Thorn Swabbie Join Date: Feb 2008 Posts: 14 Downloads: 0 Uploads: 0	What about the decoys? Does anybody use them to escape from enemy ships? I read that they are for distraction for sonar but I have not much succes with using them. Does anybody know how to use them in a good and effective way?

02-27-08, 11:47 PM	#7
-Pv- The Old Man Join Date: Apr 2006 Posts: 1,434 Downloads: 5 Uploads: 0	I haven't used them but the typical technique is to use them to make a lof of noise while you change depth and direction at minimum noise so when the enemy figures they are following a false lead, you are in an unexpected location frustrating their search. -Pv-