View Full Version : Screw sounds: closing/moving away
The sonar operator is able to tell you if a ship is moving away, closer, or keeping a constant distance. But listening to the hydrophone myself, I am not able to tell the difference. Is it possible to be able to do so? What would the difference in sound be? Is it modeled in the game?
scandium
03-20-06, 01:00 AM
There's a hydrophone tutorial you can download in the download section. To answer your question though, its not only possible to tell if the ship is moving closer or away with the hydrophone, but to use it determine the target's course precisely enough for a blind underwater torpedo shot. Haven't personally tried it though (the tutorial that is).
Awesome... thanks, scandium.
Though I did just download it and the pdf doesn't mention anything about identifying whether a target is closing or moving away. I'll try the tutorial, though, maybe they mention it in there.
scandium
03-20-06, 03:09 AM
No prob. Its rather amazing how inept the hydrophone operators can be (even qualified Chief Warrant Officer NCOs): I've sat at 20 m depth with the engines stopped, listening to the screws of an approaching ship only to have my hydrophone operator snap "No Sound Contact!" when I pass the headphones back... its enough to make you want to slap him silly.
mike_espo
03-20-06, 09:46 AM
No prob. Its rather amazing how inept the hydrophone operators can be (even qualified Chief Warrant Officer NCOs): I've sat at 20 m depth with the engines stopped, listening to the screws of an approaching ship only to have my hydrophone operator snap "No Sound Contact!" when I pass the headphones back... its enough to make you want to slap him silly.
I know your pain! :damn: :damn:
I guess the radioman qual is worthless.... :nope:
http://img127.imageshack.us/img127/2446/sonardoom9zl.jpg
scandium
03-20-06, 11:32 AM
Man you made my day, I laughed so hard I damn near fell off my chair :)
reggie_mcfly
03-20-06, 02:13 PM
That was inspired. Loved it. :D
capt-jones
03-20-06, 03:20 PM
:yep: one picture is worth a thousand words :rotfl: funniest thing ive seen since some one put him in one of the torpedo tubes ;) i remember that one
Oberon strikes again! :rotfl:
Anyone here though that you can hear if the contact is coming closer when the sound gets louder? :up:
The AI sonar operator just has better hearing, so he can tell it in a split second.
If I was the captain, I would assign these radiomans into the next u-Boat trip to La Spezia :arrgh!:
If I was the captain, I would assign these radiomans into the next u-Boat trip to La Spezia :arrgh!:
La Spezia is THE place to be! Can´t wait for WaW2, to get back to Med! :rock:
Type XXIII
03-20-06, 04:38 PM
Oberon strikes again! :rotfl:
Anyone here though that you can hear if the contact is coming closer when the sound gets louder? :up:
The AI sonar operator just has better hearing, so he can tell it in a split second.
Well, in theory*, you can also listen carefully to the pitch and judge the contact's relative speed to you based on doppler effects. Maybe the sonar operator has a very good musical ear...
*) well, in reality the pitch differences would be minimal, since the speed of a merchant relative to the speed of sound in water is negligible. But we don't have to say that loud, do we?
DMarkwick
03-20-06, 06:37 PM
If the screws sound clockwise, it's moving away. If they sound anti-clockwise, it's moving toward you.
kenijaru
03-20-06, 06:42 PM
If the screws sound clockwise, it's moving away. If they sound anti-clockwise, it's moving toward you.
how am i suposed to hear that?
how am i suposed to hear that?
I'm pretty sure that was a joke.
Oberon, that was classic! Thanks!
DMarkwick
03-20-06, 08:23 PM
how am i suposed to hear that?
I'm pretty sure that was a joke.
Yes it was, sorry for the lack of smiley :D
I guess the only way to determine it, given that no-one really knows yet, is to set up a situation in the mission editor where 2 identical vessels are fairly close by, one going and one coming, then listen to them both and try to determine a difference.
It'll be difficult, later on in a "real" patrol though, trying to determine if one particular signal is going or coming without the reference of an opposite to compare it to. But then that's why you pay the hydrophone operator so much right? ;) :D
kenijaru
03-20-06, 08:49 PM
you can always use the active sonar (given that you have it installed)
greyrider
03-21-06, 11:42 AM
when the sonarman exclaims, "moving away", or "closing",i think he's using the fringe bearings of the sound contact, not the bearing that the contacts is on at the moment.
in other words , he is using the width of the sound cone to determine range, called out as long, medium, or short range, and also closing and moving away.
i have been working with the hydrophones now for almost a year since the sh3 release, and so i feel like a veteran sonarman.
i am pretty close to announcing to the community that i am able to
determine course, speed, and range of a target just by listening to the hydrophones.
one way was the sonar tutorial that i put out, that was one way,
but i have been working with the ambient sound of the hydrophones vs the amplitude of the sound contact.
the ambient sound from the hydrophones is a constant level of sound, it never changes, but the sound of a targets propellers gets louder as it closes on the u-boat,
at some range, the screw sounds overcome the sound level of the ambient sound of the hydrophones, and completely drowns out the sound of the phones.
determining when this happens, will give us the range the target is from the u-boat. this is one reason why its so important to know the max listening range of the phones, because if you know the time when the contact first entered the listening range, once it gets to the point where the ambient noise of the phones are completely drowned out, you be able to calculated for speed also.
the sound cone also can be used for range estimation. the width of the sound cone gets wider as the contact closes
just a few more days work, and ill be able to post more about this.
by the way, for me anyway, the sound of the contacts propellers
drowns out the sound of the phones about 15 km.
i have to listen a few more times, because i want to get it precise
this method is going to be a user method, everyone might get different results, because someones hearing might be better than others, and so may vary from person to person, but not by much.
awesome, thanks greyrider
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