Following an article of February 28, 2019 Anonymous provided the comments below:
Currently, Japan [J] has three kinds of submarine, Oyashios (non-AIP, with Lead-acid Batteries (LABs)), Soryu MkI (Stirling AIP, with LABs) and is building Soryu MkII (non-AIP, with Lithium-ion Batteries (LIBs)) (see Table below). The operational period of J-submarines are as long as 70 days, mainly limited by amount of food [1].
A Soryu MkI's AIP use will end once the LOx is used up. But in a Soryu MkII (with LIBs) there is no such limitation and the underwater mission is carried out after recharge of LIBs in quiet sea area [2]. The operation of an AIP Soryu MkI suffers due to huge 100 (?) ton LOx tank it has to carry for AIP. In contrast the lack of a LOx tank on a LIBs Soryu MkII provides more space for crew accommodation making MkII's more suitable for the mixed male/female crewing that Japan is introducing.
[Comments on SAAB-Damen and ASC-Collins will be published separately on March 15, 2019.]
[Comments on SAAB-Damen and ASC-Collins will be published separately on March 15, 2019.]
[1] The range of J-submarines (maybe 6,000nm) is considerably shorter than the Australian Collins-class (around 10,000nm with longer transit legs within same operational period of 70 days). Presumably, J-subamarines sit, monitoring, on the seafloor for long periods. Hence less mobile J-subs do not need extra fuel.
[2] Information from retired submarine Admiral, Masao Kobayashi.
TABLE. Japanese Soryu and Oyashio Programs as at November 7, 2019
SS
No.
Diesel Type
Motor
|
Build No
Name
|
Pennant
No.
|
MoF approved amount ¥
Billions FY
|
LABs, LIBs, AIP
|
Laid Down
|
Laun
-ched
|
Commi
ssioned
|
Built
By
|
5SS Oyashio
|
8105 Oyashio
|
SS-590/ TS3608
|
¥52.2B FY1993
|
LABs only
|
Jan 1994
|
Oct 1996
|
Mar 1998
|
KHI
|
6SS-15SS
Oyashios
10 subs
SMC-7?
|
8106
-8115
various
|
SS-591-600
|
¥52.2B per sub
FY1994-FY2003
|
LABs only
|
15SS Feb
2004
|
15SS
Nov
2006
|
15SS
Mar 2008
|
MHI
&
KHI
|
16SS
Soryu Mk I
SMC-8
|
8116
Sōryū
|
SS-501
|
¥60B FY2004
|
LABs + AIP
|
Mar 2005
|
Dec 2007
|
Mar
2009
|
MHI
|
17SS
|
8117
Unryū
|
SS-502
|
¥58.7B FY2005
|
LABs + AIP
|
Mar 2006
|
Oct 2008
|
Mar
2010
|
KHI
|
18SS
|
8118
Hakuryū
|
SS-503
|
¥56.2 FY2006
|
LABs + AIP
|
Feb 2007
|
Oct 2009
|
Mar
2011
|
MHI
|
19SS
|
8119
Kenryū
|
SS-504
|
¥53B FY2007
|
LABs + AIP
|
Mar 2008
|
Nov 2010
|
Mar
2012
|
KHI
|
20SS
|
8120
Zuiryū
|
SS-505
|
¥51B FY2008
|
LABs + AIP
|
Mar 2009
|
Oct 2011
|
Mar
2013
|
MHI
|
No 21SS
|
No 21SS built
| |||||||
22SS
|
8121
Kokuryū
|
SS-506
|
¥52.8B FY2010
|
LABs + AIP
|
Jan 2011
|
Oct 2013
|
Mar
2015
|
KHI
|
23SS
|
8122
Jinryu
|
SS-507
|
¥54.6B FY2011
|
LABs + AIP
|
Feb 2012
|
Oct 2014
|
7 Mar 2016
|
MHI
|
24SS
|
8123
Sekiryū
|
SS-508
|
¥54.7B FY2012
|
LABs + AIP
|
KHI
| |||
25SS
|
8124
|
SS-509
|
¥53.1B FY2013
|
LABs + AIP
|
22 Oct 2013
|
12 Oct 2016
|
MHI
| |
26SS
end of SMC-8s
|
8125
|
SS-510
|
LABs + AIP
|
2014
|
6 Nov 2017
|
KHI
| ||
27SS First
Soryu Mk II
diesel
first SMC-8B
motor
|
8126
|
SS-511
|
LIBs only
(NCA type)
|
2015
|
4 Oct
2018
|
Mar
2020?
|
MHI
| |
28SS Second
Soryu Mk II
SMC-8B
|
SS-512
|
LIBs only
(NCA type)
|
6 Nov 2019
|
Mar 2021?
|
KHI
| |||
29SS First Soryu Mk III
SMC-9?
|
8128
|
?
|
¥76B FY2017
|
LIBs only?
|
?
|
?
|
2022?
|
MHI?
|
30SS Second Soryu Mk III
|
8029
|
SS-514
|
LIBs only?
|
2021?
|
KHI
|
Table from information exclusively provided to Submarine Matters. LABs = lead-acid batteries, AIP = air independent propulsion, LIBs = Lithium-ion Batteries. ¥***B = Billion Yen. MHI = Mitsubishi Heavy Industries, KHI = Kawasaki Shipbuilding Corporation of Kawasaki Heavy Industries. Numbers before "SS" refer to "Heisei" the year of the reign of Japan's previous Emperor Akihito who abdicated on 30 April 2019. Hence "30SS" refers to the last year (the 30th year) of Akihito's reign. The next year will likely be "1SS" and will likely be called a new submarine class name (ie. not "Soryu").
---
Thankyou Anonymous (further translation by Pete).
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