why no rebound sound ?

KriegsMarine · 03-31-20, 11:52 AM

hi, captians! I'm always confused when i play the Silent Hunter 3 and Silent Hunter 4, that is when you are at periscope depth, then an escort is pinging your sub,why you and your crew could not hear the ASDIC ping rebound sound when the escort found your sub. As far as i could remember, when i played the old Silent Hunter Commander's Edition, you really could hear a sonar rebound sound when the tin can caught you, which is a good warning of losing your stealth. So which situation indeed is historically accurate ?

Sailor Steve · 03-31-20, 01:10 PM

If you had Asdic/Sonar it would echo the original signal. The soundman would hear it, and if he put it on the speakers the whole crew could hear it. If you had no Asdic or it was shut off you would not hear it as a signal, but the sound travelling through the water would make a noise inside the boat like "...pebbles bouncing off a roof" (I currently cannot find the source for that quote, so make of it what you will).

U301 · 03-31-20, 02:41 PM

I heard Asdic sounded like..."gravel on the hull",
"a hawser being dragged across the hull"
and "a hammer hitting the outside of the U-Boot!"

(Not all at once but depending on your depth and the water temperature!)

KUrtz

Kpt. Lehmann · 03-31-20, 07:14 PM

It seems to me that only the sender of the pulse would hear it's return.

ie: ASW SONAR guy up top hits 'send sound pulse' and hears that ping.... if nothing is down there, he gets no return ping. He can then send more pings at will... ping... ping... ping.... (individual events.)

... now he sends a ping and hears the return/rebound ping... a double event if you will... ping-PING...

Now from the hunted submarine crew perspective, they only ever hear abient individual pings that may be distant, or perhaps individual louder pings with increasing rapidity as the sender fixes the target. The sub crew never hears a ping-PING because the rebound of the pulse happens the instant it strikes the hull...

... but in a quick moment, that rebound is heard by the sender as above.

If my post looks funny, it is because Major Wifey is pinging me now...

U301 · 04-02-20, 09:16 AM

Quote:

Originally Posted by Kpt. Lehmann

If my post looks funny, it is because Major Wifey is pinging me now...

Often thought by KUrtz under attack... "you ping away (babe)!"

Pisces · 04-02-20, 10:09 AM

The only case the sub would hear a second (delayed) ping is through reflections on nearby objects. Like bottom bounce or bounce off a vertical shelf.

The suggestion that the sub notices the detection through double or modulated pings is a fake mechanism.

d@rk51d3 · 03-31-20, 08:14 PM

Quote:

Originally Posted by U301

I heard Asdic sounded like..."gravel on the hull",
"a hawser being dragged across the hull"
and "a hammer hitting the outside of the U-Boot!"

(Not all at once but depending on your depth and the water temperature!)

KUrtz

Also heard it could sound like a chain being dragged over the hull.

KriegsMarine · 04-02-20, 02:05 AM

thanx guys

and Kpt. Lehmann, the explanation is very impressive, salute !

so the situation in SHCE is not technically and historically accurate, it just

gives the game more fun.

03-31-20, 11:52 AM	#1
KriegsMarine Loader Join Date: Jan 2008 Location: West Point Posts: 87 Downloads: 1280 Uploads: 0	why no rebound sound ? hi, captians! I'm always confused when i play the Silent Hunter 3 and Silent Hunter 4, that is when you are at periscope depth, then an escort is pinging your sub,why you and your crew could not hear the ASDIC ping rebound sound when the escort found your sub. As far as i could remember, when i played the old Silent Hunter Commander's Edition, you really could hear a sonar rebound sound when the tin can caught you, which is a good warning of losing your stealth. So which situation indeed is historically accurate ? __________________ Lieutenant George W. Bush

03-31-20, 01:10 PM	#2
Sailor Steve Eternal Patrol Join Date: Nov 2002 Location: High in the mountains of Utah Posts: 50,369 Downloads: 745 Uploads: 249	If you had Asdic/Sonar it would echo the original signal. The soundman would hear it, and if he put it on the speakers the whole crew could hear it. If you had no Asdic or it was shut off you would not hear it as a signal, but the sound travelling through the water would make a noise inside the boat like "...pebbles bouncing off a roof" (I currently cannot find the source for that quote, so make of it what you will). __________________ “Never do anything you can't take back.” —Rocky Russo

03-31-20, 02:41 PM	#3
U301 Officer Join Date: Jan 2020 Location: UK Posts: 248 Downloads: 782 Uploads: 0	I heard Asdic sounded like..."gravel on the hull", "a hawser being dragged across the hull" and "a hammer hitting the outside of the U-Boot!" (Not all at once but depending on your depth and the water temperature!) KUrtz __________________ TorpedoTubesFireFinal. https://www.subsim.com/radioroom/dow...o=file&id=2764 2020 SubSim. https://www.youtube.com/watch?v=vWTr8me3JlM Last edited by U301; 03-31-20 at 05:40 PM.

03-31-20, 07:14 PM	#4
Kpt. Lehmann GWX Project Director Join Date: Jul 2005 Location: The Republic of Texas Posts: 6,875 Downloads: 115 Uploads: 0	It seems to me that only the sender of the pulse would hear it's return. ie: ASW SONAR guy up top hits 'send sound pulse' and hears that ping.... if nothing is down there, he gets no return ping. He can then send more pings at will... ping... ping... ping.... (individual events.) ... now he sends a ping and hears the return/rebound ping... a double event if you will... ping-PING... Now from the hunted submarine crew perspective, they only ever hear abient individual pings that may be distant, or perhaps individual louder pings with increasing rapidity as the sender fixes the target. The sub crew never hears a ping-PING because the rebound of the pulse happens the instant it strikes the hull... ... but in a quick moment, that rebound is heard by the sender as above. If my post looks funny, it is because Major Wifey is pinging me now... __________________ www.thegreywolves.com All you need is good men. - Heinrich Lehmann-Willenbrock

04-02-20, 10:09 AM	#6
Pisces Silent Hunter Join Date: Dec 2004 Location: AN9771 Posts: 4,892 Downloads: 302 Uploads: 0	The only case the sub would hear a second (delayed) ping is through reflections on nearby objects. Like bottom bounce or bounce off a vertical shelf. The suggestion that the sub notices the detection through double or modulated pings is a fake mechanism. __________________ My site downloads: https://ricojansen.nl/downloads Last edited by Pisces; 04-02-20 at 01:22 PM.

04-02-20, 02:05 AM	#8
KriegsMarine Loader Join Date: Jan 2008 Location: West Point Posts: 87 Downloads: 1280 Uploads: 0	thanx guys and Kpt. Lehmann, the explanation is very impressive, salute ! so the situation in SHCE is not technically and historically accurate, it just gives the game more fun. __________________ Lieutenant George W. Bush