ASDIC question

JuanLiquid · 05-26-17, 02:17 AM

After around 8 years playing this game I still have some basic doubts

When you hear a destroyer which is pinging... is it always pinging YOU? I mean, always you hear a ping, do they know your exact location? Or they are still looking for you?

In other submarine games, not as realistic as SH3, you hear when they are pinging to the empty ocean, but when they ping you, you hear the normal ping sound and how the sounds reflect in your hull (2 sounds). Is that how it should work? Or just SH3 doesn't simulate it?

bstanko6 · 05-26-17, 11:15 AM

ASDIC is directional, meaning it needs to be pointed. When you hear the sound, they do not know where you are until your sonarman says... they are pinging us sir!.

Now understand, he says that because he hears the "eco" bounce off the hull. At no time does this mean he knows exactly where you are. Depending on your depth, profile, weather, and distance, he may "think" you are at a particular position.

When you hear the ping go off and repeat faster and he begins to close is when he actually attempts to charge you, And many times he falls short and you hear explosions in the distance.

05-26-17, 11:36 AM

If I'm enough distant and with the shortest profile, I still can hear ping but my noise indicator remains green.

BigWalleye · 05-26-17, 12:21 PM

Basic physics. Passive sensors (radar warning, hydrophone) go as the square of the distance. Twice as far, four times as weak. Active sensors (radar, ASDIC) go as the fourth power of the distance. Twice as far, sixteen times as weak! You can hear him pinging you four times as far away as he can locate you. (All things being equal, which they never are.) So when you hear him pinging, he's searching. When you hear him make an attack run, he's probably found you. When the cans go off nearby, he's got you.

JuanLiquid · 05-26-17, 04:56 PM

Thanks for the replies. My real question would be then: Can you hear the echoes when they aimed you with the ASDIC? Should it be audible by all the crew, or just the hydrophone?

I'll watch tomorrow the video and I'll coment here, I'm too tired today. Thanks

BigWalleye · 05-26-17, 05:33 PM

Consensus is that everyone in the boat could hear it. https://www.reddit.com/r/AskHistoria...s_really_hear/ Interesting thread, some from ex-submariners. Even links to a couple of audio clips of sonar pinging.

bstanko6 · 05-28-17, 08:40 PM

Thank you

05-29-17, 05:55 AM

Quote:

Originally Posted by BigWalleye

Consensus is that everyone in the boat could hear it. https://www.reddit.com/r/AskHistoria...s_really_hear/ Interesting thread, some from ex-submariners. Even links to a couple of audio clips of sonar pinging.

The link provided on this website has changed : http://www.hnsa.org/resources/histor...nd-in-the-sea/

fanch · 05-30-17, 04:39 AM

Thanks for the correct url, it's very interesting to hear.

Yesterday i was tempting to escape from a sticky DD at my back, hearing at him with hydrophones. On March 41, he never found me depite of launching some depth charges: i was moving to hazardly for him.

At first hear, it's difficult to distinguish the echo from the initial ping of ASDIC. with habit, np.

05-26-17, 02:17 AM	#1
JuanLiquid Machinist's Mate Join Date: Jun 2016 Posts: 130 Downloads: 60 Uploads: 0	ASDIC question After around 8 years playing this game I still have some basic doubts When you hear a destroyer which is pinging... is it always pinging YOU? I mean, always you hear a ping, do they know your exact location? Or they are still looking for you? In other submarine games, not as realistic as SH3, you hear when they are pinging to the empty ocean, but when they ping you, you hear the normal ping sound and how the sounds reflect in your hull (2 sounds). Is that how it should work? Or just SH3 doesn't simulate it?

05-26-17, 11:15 AM	#2
bstanko6 Admiral Join Date: Feb 2015 Location: Murwik Naval Academy Posts: 2,122 Downloads: 390 Uploads: 13	ASDIC is directional, meaning it needs to be pointed. When you hear the sound, they do not know where you are until your sonarman says... they are pinging us sir!. Now understand, he says that because he hears the "eco" bounce off the hull. At no time does this mean he knows exactly where you are. Depending on your depth, profile, weather, and distance, he may "think" you are at a particular position. When you hear the ping go off and repeat faster and he begins to close is when he actually attempts to charge you, And many times he falls short and you hear explosions in the distance. __________________ [SIGPIC][/SIGPIC] BSTANKO6'S SH5 NAVAL ACADEMY http://www.youtube.com/channel/UCPbe...W2NArCA/videos DISCORD https://discord.gg/6tFeTSUmVc

05-28-17, 08:40 PM	#7
bstanko6 Admiral Join Date: Feb 2015 Location: Murwik Naval Academy Posts: 2,122 Downloads: 390 Uploads: 13	Thank you __________________ [SIGPIC][/SIGPIC] BSTANKO6'S SH5 NAVAL ACADEMY http://www.youtube.com/channel/UCPbe...W2NArCA/videos DISCORD https://discord.gg/6tFeTSUmVc

05-26-17, 11:36 AM	#3
Kendras Stowaway Posts: n/a Downloads: Uploads:	If I'm enough distant and with the shortest profile, I still can hear ping but my noise indicator remains green.

05-26-17, 12:21 PM	#4
BigWalleye Sea Lord Join Date: Jul 2012 Location: On the Eye-lond, mon! Posts: 1,987 Downloads: 465 Uploads: 0	Basic physics. Passive sensors (radar warning, hydrophone) go as the square of the distance. Twice as far, four times as weak. Active sensors (radar, ASDIC) go as the fourth power of the distance. Twice as far, sixteen times as weak! You can hear him pinging you four times as far away as he can locate you. (All things being equal, which they never are.) So when you hear him pinging, he's searching. When you hear him make an attack run, he's probably found you. When the cans go off nearby, he's got you.

05-26-17, 04:56 PM	#5
JuanLiquid Machinist's Mate Join Date: Jun 2016 Posts: 130 Downloads: 60 Uploads: 0	Thanks for the replies. My real question would be then: Can you hear the echoes when they aimed you with the ASDIC? Should it be audible by all the crew, or just the hydrophone? I'll watch tomorrow the video and I'll coment here, I'm too tired today. Thanks

05-26-17, 05:33 PM	#6
BigWalleye Sea Lord Join Date: Jul 2012 Location: On the Eye-lond, mon! Posts: 1,987 Downloads: 465 Uploads: 0	Consensus is that everyone in the boat could hear it. https://www.reddit.com/r/AskHistoria...s_really_hear/ Interesting thread, some from ex-submariners. Even links to a couple of audio clips of sonar pinging.

05-30-17, 04:39 AM	#9
fanch Swabbie Join Date: May 2017 Location: Britain, France Posts: 9 Downloads: 4 Uploads: 0	Thanks for the correct url, it's very interesting to hear. Yesterday i was tempting to escape from a sticky DD at my back, hearing at him with hydrophones. On March 41, he never found me depite of launching some depth charges: i was moving to hazardly for him. At first hear, it's difficult to distinguish the echo from the initial ping of ASDIC. with habit, np.