SSN Thread (older operational, but not PLAN)

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Gepard in the ice the only completed Akula III it has an enlarged sail and a different towed-array dispenser on the vertical fin as others Akula

 

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Victor III

 

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Russian Sierra/Project 945 Class Titanium-hulled attack sub

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A Los Angeles with a Dry-Deck Shelter for SDV

Some LA was modified for carry a DDS.
All Viginia can have, the Carter also no sure for the 2 first Seawolf and Ohio SSGN can carry 2 DDS.

 

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Los Angeles

 

[Hyperwarp]

To Jeff and all other naval pros; I know sub noise level subject is complicated and not 2-dimentional plus, many details are classified. But I created this simplified graph based ONI plus internet speculation. Is the graph reasonable? What are the modifications I can make?

PS: I excluded the speculated values for the PLAN SSN

 

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Radiated noise i think, and the noise level corresponds to the top of the flag by ex Seawolf/Virginia 95 dB, in this case good number for some types to see after.

 

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In the same time posting for speed the more to left, and deepth also an advantage for silent the sound is more diffuse " scattered " to very deep

Good number for the graphic, maybe Yasen/Graney more fast ? new to see...
Units number in 2016 a little different.


For historical records :
Alfa up to 41 kn in fact 39 deepth 420 to 800 m
Mike : max 1250 m !
Papa : in trials 44.7 kn
Seawolf in trials 44 kn.

I add US :
Seawolf 40 kn, depth max 600 m
Only no Russian submarine able to to dive to great depths, hull in HY-100, 2 LA 688i have also a hull in this steel used for test for Seawolf.
L.A 32 kn, max 450 m
Virginia 34 kn, max 500 m
Ohio 25 kn, max 450 m
US have the better sonars and fire control/electronic systems.

According Russians datas and i have exact here

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operationnal deepth is to 80 % of the maximum in this case for US 480, 400, 360 m.

 

[FORBIN]

To Jeff and all other naval pros; I know sub noise level subject is complicated and not 2-dimentional plus, many details are classified. But I created this simplified graph based ONI plus internet speculation. Is the graph reasonable? What are the modifications I can make?

PS: I excluded the speculated values for the PLAN SSN

View attachment 28288

Noise levels are very tricky issues. Lot of variable, including the speed of the sub. But in general what I have heard is:

Seawolf/Astute/Virginia: ~95 dB
Yasen: ~100 dB (probably less, but not as low as above)
Project 971U/971M: 105 dB
LA 688i: 105 dB to 110 dB
Trafalgar: 110 dB - 115 dB
LA 688: 115 dB - 120 dB
Project 971/ 971I: 130 dB
.....

I doubt 093 is at 110 dB. That would put it in 971U/971M, 688i Trafalgar range! PLA switched to 093B only after 2x 093 is because it didn't meet their requirement.

So here my estimation:
095: 105 dB - 110 dB
093B: 120 dB
093: 135 dB - 140 dB
091: 150+ dB

PS:
I found this floating in the net. No idea about accuracy.

View attachment 28656

Exactly my feeling for 093 all experts say disappointing don' t want a Los Angeles, about Sierra/Oscar II 115/120 dB, 093B to 110 ?

Mine : synthesis from severals sites.
95 dB : Seawolf, Virginia, Astute
100/105 : Yasen, last Western/Soryu SSK in AIP more definitely 95 maximum
105 : LA 688i, Akula 971/971UM, Ohio, Kilo 636M
105/110 : Trafalgar
110 : LA Fl I/II, Akula first, Rubis
115 : Kilo 877
115/120 : Sierra, Oscar II, 093
120 : Delta IV
120/130 : 094
125 : Typhoon
125/130 : Delta III, Victor III
135/140 : Han
150 : Xia

Much Type 209 the last want about a LA 110 dB, Yuan enough good, Song is medium.

 

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Los Angeles Class San Francisco
Video of a submerging submarine from a dolphin's point of view

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