ASDIC clarification

flag4 · 04-03-13, 09:50 AM

Thanks for sharing that RustySubmarine.
It's great to hear about a first hand experience.

Marcello · 04-03-13, 01:36 PM

Going by accounts of WW2 patrols of german and italians subs active sonar was audible by the crew as follow:
1) Ticking, as of a clock. Most common description I have encountered in my admittedly limited sample.
2) As if gravel was thrown on the hull.
3) Banging hammer (I have this replacing the stock ping in my game install).
Circular saw noises were frequently reported as well, but nobody was really sure if that was ASDIC or anti homing torpedo decoys.
Ping style sound is never described by those on the receiving end.

Kelly621 · 04-03-13, 02:29 PM

In twenty plus years of riding fast attacks and a couple of FBM's I never once heard any active sonar. Others on board did and described it similar to what has been already posted here, but being back aft by the propulsion equipment with ear plugs shoved in my ears I did not hear much of anything

Kelly621

flag4 · 04-03-13, 03:02 PM

*..off topic - a bit..*

I have a sonar ping for my ring tone on my android.

a bit like this but very clear -
I love it.

Sailor Steve · 04-03-13, 04:22 PM

I've had one on my plain old cell phone for a couple of years now.

nikimcbee · 05-20-13, 12:32 PM

On a side note, how did WW2 era sonar locate a sub on sitting on the bottom. Wouldn't the sub be lost in the return echo?

Tupolev · 05-20-13, 12:44 PM

I'm thinking it would be dependent on what the ocean floor was comprised of near the bottomed submarine.

If its rocks/reefs/sunken ships then I'd think the return echo would be split up amongst those features. But if its mud or sand the ping's energy might be absorbed by the ocean floor, leaving the highly reflective submarine highlighted.

But then I could be completely wrong.

ninja turtle · 05-20-13, 12:41 PM

Quote:

Originally Posted by flag4

Thanks for sharing that RustySubmarine.
It's great to hear about a first hand experience.

04-03-13, 09:50 AM	#1
flag4 Watch Officer Join Date: May 2007 Location: as far away as possible Posts: 1,625 Downloads: 147 Uploads: 0	Thanks for sharing that RustySubmarine. It's great to hear about a first hand experience. __________________ [SIGPIC][/SIGPIC] ' We are here on Earth to fart around. Don't let anybody tell you any different.' Kurt Vonnegut

04-03-13, 03:02 PM	#4
flag4 Watch Officer Join Date: May 2007 Location: as far away as possible Posts: 1,625 Downloads: 147 Uploads: 0	..off topic - a bit.. I have a sonar ping for my ring tone on my android. a bit like this but very clear - I love it. __________________ [SIGPIC][/SIGPIC] ' We are here on Earth to fart around. Don't let anybody tell you any different.' Kurt Vonnegut

04-03-13, 04:22 PM	#5
Sailor Steve Eternal Patrol Join Date: Nov 2002 Location: High in the mountains of Utah Posts: 50,369 Downloads: 745 Uploads: 249	I've had one on my plain old cell phone for a couple of years now. __________________ “Never do anything you can't take back.” —Rocky Russo

05-20-13, 12:32 PM	#6
nikimcbee Fleet Admiral Join Date: Jul 2003 Location: Patroling the Slot. Posts: 17,952 Downloads: 90 Uploads: 0	On a side note, how did WW2 era sonar locate a sub on sitting on the bottom. Wouldn't the sub be lost in the return echo? __________________

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04-03-13, 01:36 PM	#2
Marcello Planesman Join Date: Nov 2012 Posts: 183 Downloads: 49 Uploads: 0	Going by accounts of WW2 patrols of german and italians subs active sonar was audible by the crew as follow: 1) Ticking, as of a clock. Most common description I have encountered in my admittedly limited sample. 2) As if gravel was thrown on the hull. 3) Banging hammer (I have this replacing the stock ping in my game install). Circular saw noises were frequently reported as well, but nobody was really sure if that was ASDIC or anti homing torpedo decoys. Ping style sound is never described by those on the receiving end.

04-03-13, 02:29 PM	#3
Kelly621 Officer Join Date: Dec 2012 Location: North Carolina Posts: 237 Downloads: 336 Uploads: 0	In twenty plus years of riding fast attacks and a couple of FBM's I never once heard any active sonar. Others on board did and described it similar to what has been already posted here, but being back aft by the propulsion equipment with ear plugs shoved in my ears I did not hear much of anything Kelly621

05-20-13, 12:44 PM	#7
Tupolev Hauptman Join Date: Mar 2013 Location: FL410 Posts: 174 Downloads: 75 Uploads: 0	I'm thinking it would be dependent on what the ocean floor was comprised of near the bottomed submarine. If its rocks/reefs/sunken ships then I'd think the return echo would be split up amongst those features. But if its mud or sand the ping's energy might be absorbed by the ocean floor, leaving the highly reflective submarine highlighted. But then I could be completely wrong.