A close friend has referred me to "Jive Turkey's" Youtube "Project "Northwind" 955 Borei" SSBN at https://youtu.be/gKNqVOHs71Q and below:
"Jive" uploaded it on May 5, 2019. "Jive's" rapidly rising and articulate "Sub Brief" presence is proving an eye-opener for submarine aficionados as well as for sonar-people on other platforms (eg. skimmers and aircraft). I haven't seen sonar analysis details discussed in this depth in "Jives" many Youtubes anywhere/any time.
Bits I find most interesting include:
- 0 to 60 seconds where "Jive" describes what he did in the USN and in what era, security clearance etc.
- 14:45 "Acoustic Vulnerability" of the Borei as determined on sonar spectrum display, including
vulnerabilities correlated with:
= Continuous running seamless hydraulic pump
= High demand transient
= Missile tube preparation
= Motor generator harmonics
= Swarths
= Station keeping
and
= Hull pop.
vulnerabilities correlated with:
= Continuous running seamless hydraulic pump
= High demand transient
= Missile tube preparation
= Motor generator harmonics
= Swarths
= Station keeping
and
= Hull pop.
All very interesting. Another "Jive" youtube later this week.
12 comments:
Hi Pete
Japan MoD is building 3000ton submarines as successors of Soryus, and the fourth ship (02SS) [1] will equip with new diesel generators [2].
[1] Popular name of Japanese submarine is based on the era of Japanese Emperor where the eras Heisei and Reiwa are former and present Emperor, respectively. Then, name, second, third and fourth ships are known as 29SS, 30SS, 01SS and 02SS for FYs 2017 (Heisei 29), 2018 (Heisei 30), 2019 (Reiwa 01) and 2020 (Reiwa 02), respectively.
[2] LIB Soryus (27SS, 28SS) and early 3000 ton submarines (29SS, 30SS, 01SS) will equipped with 12V32/25Ss, longer stroke version of 12V25/25SB for LAB Soryus. Performance of new diesel generators for 02SS seems to be improved significantly.
Regards
His identification of which variant of the sub was interesting also. He didn't say much about their towed arrays except where they place them.
Hi Pete
Continued to comment (September 23, 2020 at 5:25 PM)
02SS will also equip with improved LIBs. Electrical system for LIB-submarine is summarized as follows:
Soryu (27SS, 28SS): LIBs type SLH; diesel generator KAWASAKI 12V25/25SB or 12V25/31
3000ton class (29SS, 30SS, 01SS): LIBs type SLH and diesel generator 12V/25/31
3000ton class(02SS): LIBs type improved SLH [1], new diesel generator [2]
[1] According ex-Minister of defense, improved SLH with better performance had been established but was not equipped because of budget shortage.
[2] As item for new diesel generator is not found in R&D planning for submarine, new diesel generator might be based on existing generator (e.g., 12V25/25SB, 12V25/31) being a largely modified version of 12V/25/31.
Regards
Hi Anonymous [Your September 23, 2020 at 5:25 PM and September 25, 2020 at 4:17 PM]
Thanks for those details. I'll include them in a new article next week that will update the Soryu/New Class Table and include the possible new diesel generators.
I anticipated at http://gentleseas.blogspot.com/2020/02/japanese-submarine-developments-through.html on February 27, 2020 that the enthronement of Japan's new Emporer Naruhito would alter the Japanese submarine numbering system to reflect a new submarine class.
Regards
Pete
Hi jbmoore
Yes at 13:52 the vertical rudder does show the difference between Borei 1s and Borei 2s. I wonder whether US sonars are sensitive enough to deternmine the differing sound of water-flows being disturbed by the different rudders?
True "He didn't say much about their towed arrays except where they place them." If the towed array is fully extended on a Borei 1 I wonder if that is detectable by dedicated US sonarmen?
Regards
Pete
Hi Pete
Continued to comment (September 23, 2020 at 5:25 PM)
Noise testing for the diesel generator in a simulated pressure hull, which was made by KHI in 2019, is conducted by KHI, strongly suggesting that the new diesel generator for 02SS is made by KHI.
Regards
Hi Pete Continued to comment (September 23, 2020 at 5:25 PM)
Judging from specifications of NDS (National Defense Standard), output of 12V25/25S (2000kW) and evolution from diesel generator for 29SS (12V25/31), output of a new diesel generator for 02SS is expected to be more than that of 12V25/31 (2500-2800kW) and to be 3000kW or more.
In this case of 3000kW-output, discretion ratio (IR) of 02SS might be 4-5%. As ex-Vice Admiral Masao Kobayashi suggested charging of LIBs would be conducted outside of operation sea area, real IR of 02SS is considerably small (less than 1%?).
[1] NDS F80182D [General Rules of Rotating Electric Machine for Ship] 4.1 a) and 4.1 g) specify rated output of AC generator and rated speed AC generator driven diesel, respectively, as follows:
4.1 a) 80, 100, 160, 200, 300,400, 500, 600, 800, 1000, 1200, 1500, 1800, 2000, 2500, 2800, 3000 [kW]
4.1 g) 900, 1200 or 1800 [rpm]
[2] SHIPS OF THE WORLD 2020, No930, Page109
“Output of KAWASAKI12V25/25S for Oyashio is 3400PS (=2040kW)”
Regards
Hi Pete Continued to comment (September 23, 2020 at 5:25 PM)
Latest information on battery arrangement for Oryu (27SS), Soryu MKII was reported [1]. There, additional LIBs are loaded in a double deck manner instead of LOx tanks [2].
Then, amount of batteries in Oryu (27SS) and Toryu (28SS) seem to be twice as much as those in Soyu MKI, suggesting loading of 960 LIB-arrays (total energy, 70MWh?). 27SS and 28SS might show better performance previously reported here, in Submarine Matters.
[1] SHIPS OF THE WORLD 2020, No935
[2] http://gentleseas.blogspot.com/2016/09/pressure-hull-alloys-debate-titanium.html
See “cutaway diagrams of Soryu submarine”
In Oryu, LOx tanks in section 10 are removed, doubled decker structure is adopted for section 10 and filled with additional LIBs (240 LIB-arrays x 2).
Regards
Hi Anonymous
Thanks for your Soryu and New Class comments of September 23, 25, 27 and 28.
I'll turn them into one long article or 2 articles beginning tomorrow (Wednesday, September 30).
Regards
Pete
Hi Anonymous
What is the chemical formula for "SLH" as in LIBs type SLH?
What company makes SLH batteries for submarine?
Regards
Pete
Hi Pete
MoD discloses purchasing information in detail but not perfectly. SLH is a model name for LIB of submarine. SLH is made by GS YUASA. Specifications of equipment are classified as “old”, “revised” and “new” for existing, revised and new models, respectively.
Specification class of SLH for 02SS in FY2020 is “revised”, suggesting that LIB for 02SS is improved version of LIBs (“old” SLH) for 01SS. If LIB is fully model changed, new model name is selected and specification is “new”.
Specification of diesel generator for 02SS in FY2020 is classified as “new”, suggesting that it is a new model.
In 27SS, improvements other than LIBs are achieved, and 28SS Toryu improves 27SS somewhat.
By the way, ex-Vice Admiral (not Kobayashi) of JMSDF said nuclear submarine is needed in future, because even LIB-submarine is still powerless (10% energy of nuclear submarine). RAN might have the same idea for AUS.
Regards
Hi Anonymous
Thanks for your September 29, 2020 at 11:21 PM explanation.
Cheers
Pete
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