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A rare photo of the USN nuclear-powered fast attack submarine USS Seawolf's forward sonar

ZeEa5KPul

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Since you people can't help but involve China in everything (understandable that the new hegemon would weigh heavily on you), I'm going to have to be the party pooper and crash your little love-in
China went and built the largest nuclear submarine yard in the world... then made it bigger
 

T-SaGe

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No need to insult forum members. The question is in the first message. After 15 messages, 'China has equivalent system' claim has not yet been proven yet.
 

Team Blue

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Since you people can't help but involve China in everything (understandable that the new hegemon would weigh heavily on you), I'm going to have to be the party pooper and crash your little love-in
China went and built the largest nuclear submarine yard in the world... then made it bigger
Just what you Canadians want us to think
 

Tai Hai Chen

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If that's the case, can you share a picture of 095?


Anyways, From Wikipedia

General characteristics
Class and type:Seawolf-class submarine
Length:353 ft (108 m)
Beam:40 ft (12 m)
Draft:36 ft (11 m)
Propulsion:One S6W reactor
Speed:25+ knots submerged, 18+ knots surfaced
Test depth:Greater than 800ft
Complement:15 officers and 101 men
Armament:eight 26-inch torpedo tubes, 40 torpedoes and missiles, or 100 mines
Type 095 seems to be comparable to later blocks of Virginia, has VLS tubes.

 

Tai Hai Chen

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Beast

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indeed it is rare

as a matter of fact a photo of a Seawolf is rare let alone the sonar

Good find

China has Type 093 SSN and Type 091 SSN and also a newer version of Type 093A SSN

unfortunately they have never carried out a deep sea patrol in 30 years, lack of experience lack of decent SSN capability and reliability issues
Thank you for your intel. That means China SSBN has very successful strategic patrol since non of you all detected its deep sea patrol over the time! :enjoy:
No need to insult forum members. The question is in the first message. After 15 messages, 'China has equivalent system' claim has not yet been proven yet.


China’s new submarine engine is poised to revolutionize underwater warfare
It looks a lot like 'Red October' in real life.
BY JEFFREY LIN AND P.W. SINGER JUNE 02, 2017
China’s new submarine engine is poised to revolutionize underwater warfare

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In Tom Clancy’s book (and, later, the 1990 film) The Hunt For Red October, a Soviet submarine debuts a revolutionary, ultra-quiet engine that uses pumpjets and electrical propulsion technology to elude its foes. Chinese state media has reported that the nation is fitting its newest nuclear sub with an engine that sounds a lot like Clancy’s imaginings in the real world.


The Admiral and the Pumpjet
During his interview on state television, Admiral Ma Weiming, developer of the rim-driven pumpjet, shows off a laboratory, with a schematic of the pumpjet visible in the background, at right.
This month, Chinese state TV channel CCTV 13 broadcast an interview with a top Chinese naval engineer, Rear Admiral Ma Weiming. The admiral is notably responsible for the development of multiple Chinese naval electromagnetic programs, including the electromagnetic catapult and railguns. In the interview, he stated that the PLAN is fitting its newest nuclear attack submarines with a “shaftless” rim-driven pumpjet, a revolutionary and silent propulsion system.
Type 095 SSN
The Type 095 SSN, seen in this speculative fanmade CGI, will likely have VLS cells for launching a wide range of cruise missiles, pumpjet propulsion and improved quieting technology. The first Type 095 will likely begin production in late 2017 at the giant new BSHIC factory, with many more to follow in the 2020s.

If the system is being put on the latest vessels, it is likely to be used on the first Type 095 nuclear attack submarine (SSN), which is under construction.
Rim Driven Thruster
Shown here is a Schottel built rim-driven thruster, used to propel surface ships like yachts with minimal noise (the Chinese miltary rim-driven pumpjet would look similar but much larger).
A rim-driven pumpjet has a ring-shaped electrical motor inside the pumpjet shroud, which turns the vane rotor (a vane rotor has the fan blades attached to a rotating band built on a cylinder interior, as opposed to a propeller shaft) inside the pumpjet cavity to create thrust. Previous submarine pumpjets are “shrouded propellers,” which consist of a tubular nozzle covering the propeller. By removing the shaft of the propeller, the reduction in the number of moving parts decreases the noise made by the pumpjet, as well as saving hull space. Civilian manufacturers also claim that rim driven pumpjets are easier to maintain, and have less cavitation (bubbles that form during propeller movement), making them even more quiet.
IEPS
Rear Admiral Ma presents a component of the new Chinese IEPS for naval warships; the Chinese variant is the world’s first IEPS to run on a medium-voltage, direct-current system.
Also in the video background was a large piece of electrical machinery, which is part of the PLAN’s Integrated Electrical Propulsion System (IEPS). IEPS turns all the output of the ship’s engine into electricity, unlike traditional propulsion designs, which convert engine and reactor output into mechanical action to turn the propeller shaft.

The high electrical output can be used to power motors for the propellers or potentially high-energy weapons. Additionally, IEPS has far fewer moving parts, making them quieter, and thus ideal for use on submarines. When coupled with quieter reactors like the Type 095’s reported natural circulation reactor, the rim-driven pumpjet and IEPS can drastically reduce the acoustic signature of any SSN.
This combination, if it works, would be a significant gain for China’s naval power. As China has gained in surface fleet numbers, stealthy planes, and longer-ranged missiles able to target U.S. carriers and air bases, America’s submarine force has become viewed as its key advantage in any comparison. In turn, Chinese nuclear submarines have lagged behind competitors in their noisiness. Said another way, these innovations have the potential to strengthen a historic weakness.
The reporting is significant for two more reasons. First, it illustrates the new openness in Chinese state media to discuss the technology behind previously secretive nuclear submarines, suggesting a greater confidence in showing off new military technology in order to impress domestic and foreign audiences.

Secondly, if the system works, the Chinese may have stolen a march on the Americans and British, whose Columbia and Dreadnought nuclear ballistic missile submarine (SSBN) have the option for rim-drive pumpjets, but will not enter service until 2030. While the system would be on China’s attack submarine, Chinese SSBNs could also use the rim-drive pumpjet to enhance their stealth and survivability—and, by extension, the credibility of China’s second strike nuclear capability. These new submarine propulsion systems may not just power China’s submarines of the future, but give Beijing a true superpower’s underwater armada.
 

LeGenD

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source - https://twitter.com/cayroskop


Does China have an equivalent sonar on its SSNs? I dont know.
This is something that RAND will not tell you.

Notional configurations for reference:





Seawolf class submarines are heavily optimized for ASW and surveillance missions. Sheer size and sophistication of its sonar system fit the bill.



Seawolf class submarines are incredibly quiet even at high tactical speeds by virtue of a revolutionary Pumpjet propulsor (PJP) system among other qualitative factors (classified information in large part).



Seawolf class hull is constructed with HY-100 steel to withstand water pressure at depths exceeding 2000 feet, and these submarines are incredibly rugged as a whole; these submarines are known to function under the thick of ice for extended periods time.
 

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