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speed150mph
10-27-17, 02:40 PM
I was reading the article in the news feed about the Chinese supposedly testing an MHD propulsion system and a question entered my mind that I though I'd put forward to you gents.

Obviously some details are probably classified, and this probably differs from sub type and class and speed and depth. However I'm curious just how much of a modern nuclear submarine's radiated noise signature is produced by the screw pump jet, and other assorted drive components that directly propel the submarine.

By comparison how much noise is produced by the machinery like pumps, hydraulics, electric generators, steam noises from the reactor Ect. How much is created by other factors like flow noise, and crew.

Thanks
ET2SN
10-27-17, 04:59 PM
Obviously some details are probably classified


You're right, they are. :up:
speed150mph
10-27-17, 11:10 PM
Shoot. Knew I should have joined the navy. But then again Canada doesn't have much of a Navy to join XD
Mr Quatro
10-28-17, 08:09 AM
What makes the most noise on a submarine?

The chief of the boat when they run out of coffee :D
Sailor Steve
10-28-17, 11:22 AM
:rotfl2::rock:
ET2SN
10-29-17, 07:43 AM
What makes the most noise on a submarine?

The chief of the boat when they run out of coffee :D

Don't forget Tacos and Chili Casserole night in crew's mess. :o

:D
ETR3(SS)
10-31-17, 01:38 PM
The A-Gang LPO running naked covered in creamed corn towards the AMR2 watch on halfway night.
ET2SN
11-01-17, 02:32 AM
The sound of EB Green tape being pulled off its roll.
Especially when its you who's about to get wrapped in it. :o
MR_AUS
11-28-17, 05:30 PM
Some interesting (and technical) info here:
https://www.armscontrol.ru/subs/snf/snf03221.htm

http://gentleseas.blogspot.com.au/2016/10/submarine-noise.html
mapuc
11-28-17, 06:26 PM
This thread made me remember a documentary about modern subs.

In this program a person(can't remember his title) said each time we have erased a noise problem in a sub a new one pops-up.

When he said those words I came to think of a saying- A chain isn't stronger than its weakest part.

Translate this into the world of Subs - A sub isn't more silence than its noisiest part.

Markus
Howitzer
11-28-17, 10:21 PM
If you remember the name of the documentary, please let us know. I don't recall seeing the one that you described.