tag:blogger.com,1999:blog-19245896.post85417108729865148..comments2024-03-30T00:14:23.992+11:00Comments on Submarine Matters & Australian Nuclear Weapons: Japanese Political, New Soryu and Torpedo IssuesPete2http://www.blogger.com/profile/06134037393078707072noreply@blogger.comBlogger12125tag:blogger.com,1999:blog-19245896.post-17805391076326027802020-08-24T18:38:02.892+10:002020-08-24T18:38:02.892+10:00Thanks Annono for your August 23, 2020 comment.
S...Thanks Annono for your August 23, 2020 comment.<br /><br />See my August 24, 2020 response at https://gentleseas.blogspot.com/2020/08/japans-advanced-g-rx7-type-18.html <br /><br />Regards<br /><br />PetePetehttps://www.blogger.com/profile/02624742078679760819noreply@blogger.comtag:blogger.com,1999:blog-19245896.post-68622812492968981992020-08-23T14:22:01.972+10:002020-08-23T14:22:01.972+10:00The TCCM function of the newest Japanese designs i...The TCCM function of the newest Japanese designs isn't from American designs, because Japan's large torpedo are much newer and more advanced, the USA hasn't released a large torpedo since the 70's (Mk.48). <br /><br />Japan had made the type 73 torpedo, which was set to be advanced for TCCM capability. But the USA finally enabled sale of the Mk.46 torpedo to Japan, because this torpedo already had TCCM capability, Japan cancelled the funding to advance type 73 torpedo for TCCM capability. It simply opted to purchase the Mk.46. <br /><br />The Japanese basically reverse engineered the TCCM (they even admit this) and improved it's capability for type 80 and 89 that followed. <br /><br />The type replacing type 89 is the type 18 torpedo (G-RX7). This is basically upgrading the type 89 in every way, it has more advanced TCCM, it is quieter, and it can travel a longer distance. It can only be said that the TCCM is based loosely on the Mk.46 at this point, because it's just so much more advanced than that original TCCM technology. <br /><br />The type 18 torpedo is literally the most advanced large torpedo in the world currently, it has the highest TCCM capability, it operates very quietly, can hit deep and shallow targets (subs and ships), long distance capability etc. <br /><br />Japan has quite a history of torpedo advancement, even in WW2 Germany learned of some new torpedo technology types from the Japanese from transfer agreements between the two.<br /><br /><br /><br /><br />Annonohttps://www.blogger.com/profile/12602945092396262408noreply@blogger.comtag:blogger.com,1999:blog-19245896.post-59418230684827624722016-09-01T13:57:36.012+10:002016-09-01T13:57:36.012+10:00Hi S [at 1/9/16 12:58 AM]
Thanks for your observa...Hi S [at 1/9/16 12:58 AM]<br /><br />Thanks for your observations.<br /><br />Do you think Russian submarine (using Titanium alloys for their pressure hulls) dive deeper than Japanese subs using NS110?<br /><br />Regards<br /><br />Pete <br /><br />Petehttps://www.blogger.com/profile/02624742078679760819noreply@blogger.comtag:blogger.com,1999:blog-19245896.post-41772809074187420062016-09-01T00:58:55.855+10:002016-09-01T00:58:55.855+10:00Hi Pete
NS110 reaches the highest state of develo...Hi Pete<br /><br />NS110 reaches the highest state of development of high strength steel for pressure hull. Further increase in strength than that of NS110 may cause rapid reduction in toughness and considerable increase in welding difficulty.<br /><br />Deviation form roundness of hull will provide reduction in clashing strength of pressure hull, and more than 30% reduction in the strength is very possible depending of the extent of deviation.<br /><br />Regards<br />S<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-19245896.post-1718206329325269892016-08-30T00:41:25.641+10:002016-08-30T00:41:25.641+10:00Thanks Wispywood2344
The Combat Sytem upgrades fo...Thanks Wispywood2344<br /><br />The Combat Sytem upgrades for the Oyashios are important to maintain commonality with the Soryus and to extend the lives of the Oyashios to 22 years or longer.<br /><br />Japan previously aimed for just 16 operational subs (with only 16 year lives) but this has proven inadequate.<br /><br />This Oyashio life extension program (22 years or longer) is allowing Japan to field 22 operational submarines to meet Japan's higher threat environment (of steadily more Chinese, Russian and North Korean subs).<br />- As well as increased Chinese and Russian submarine quantities their quality is improving. <br /><br />Regards<br /><br />PetePetehttps://www.blogger.com/profile/02624742078679760819noreply@blogger.comtag:blogger.com,1999:blog-19245896.post-44105753358839178842016-08-29T13:04:17.337+10:002016-08-29T13:04:17.337+10:00Regarding provisition of a (non-DCNS, non-French) ...Regarding provisition of a (non-DCNS, non-French) new snorkel generator system document details. <br /><br />As I don't know whether it is classified I can't publish it. I do not publish classified documents from allies.<br /><br />(This is also noting that Submarine Matters has NOT published DCNS documents).<br /><br />PetePetehttps://www.blogger.com/profile/02624742078679760819noreply@blogger.comtag:blogger.com,1999:blog-19245896.post-53638018974349360112016-08-29T07:44:27.443+10:002016-08-29T07:44:27.443+10:00Hi Pete
Tough and strong hull of Japanese submari...<br />Hi Pete<br /><br />Tough and strong hull of Japanese submarine enables application of this hit & run tactics. This is one of reasons for hesitation in technology transfer. The decision of full technology by Japanese government must have shocked JMSDF members, submariners and engineers. I think they relieve, especially after leakage of Scorpene technology.<br /><br />Regards<br />S<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-19245896.post-88502366913047503472016-08-29T01:49:23.862+10:002016-08-29T01:49:23.862+10:00Hi Josh, S and Anonymous
You've provided very...Hi Josh, S and Anonymous<br /><br />You've provided very interesting comments in the thread above. I'll put them in an artilce tomorrow.<br /><br />S [at 27/8/16 4:01 PM] "...After firing torpedoes, Japanese submarine will dive very deeply with maximum speed..." is most impressive.<br /><br />Not may details about this level of submarine tactics is on the Internet. It would be interesting if websites with other submarines tactics information could be located .<br /><br />Here's some non-Falklands/Belgrano involing HMS Conquerer http://www.telegraph.co.uk/news/uknews/defence/9602103/HMS-Conquerors-biggest-secret-a-raid-on-Russia.html <br /><br />Regards<br /><br />PetePetehttps://www.blogger.com/profile/02624742078679760819noreply@blogger.comtag:blogger.com,1999:blog-19245896.post-24549106486665780012016-08-27T16:01:14.987+10:002016-08-27T16:01:14.987+10:00Hi Pete
According to the ex-Vice Admiral, Masao K...Hi Pete<br /><br />According to the ex-Vice Admiral, Masao Kobayashi, the combat policy of submarine is the same now as formerly which is “after firing torpedoes, dive deeper and faster.” He also said AIP-submarine must return its base after consumption of oxygen, but, LIBs-submarine needs not return its base.<br /><br />Comment: <br />After firing torpedoes, Japanese submarine will dive very deeply with maximum speed to avoid counter attack of enemy. Japanese submarine can dive deeper than crusher depth of torpedo. If maximum speed of LIBs-Soryu is 4-5knot/h faster than that of AIP/LABs-Soryu, the former can reach maximum submerge depth few ten seconds earlier than the later. This may provide considerable improvement of survive ratio for conventional submarine during combat.<br /><br />As defense strategy of Japan is exclusively defensive posture, Japan adopts combination of submarine and other effective measures such as P3-C or P1 hunter killer.<br /><br />Various factors such as geopolitics, geology, overseas deployment of troops, domestic situation and defense policy of Australia are different from those of Japan reflecting nature and operation of submarine of the two countries.<br /><br />Regards<br />S<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-19245896.post-55222089742352353672016-08-27T13:33:31.636+10:002016-08-27T13:33:31.636+10:00I heard very interesting story as follows:
All equ...I heard very interesting story as follows:<br />All equipment inside the Japanese submarine can be disassembled into small parts to take out from a hatch in order to avoid hull cutting. Hull cutting causes reduction in roundness of hull inducing stain. None of Japanese submarines have experienced hull cutting except the case of Asashio for AIP equipment. In Collins-class submarine, the rough work, i.e., rectangular cut of hull is conducted for repair of diesel generators. For us, it is astonishing. As operation depth of Collins-class is shallow of 200m, such a hull cutting may be possible.<br /><br />As leaked data of Scorpene reveals that its maximum submerging depth is 350m, Collins-class seems to have already lost regional superiority. Should Collins-class devote to surveillance avoiding combat with enemy submarine?<br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-19245896.post-38898467512641816112016-08-27T02:53:53.043+10:002016-08-27T02:53:53.043+10:00Hi Pete
Last year then-Defense Minister, Nakatani...Hi Pete<br /><br />Last year then-Defense Minister, Nakatani was heavily criticized by a weekly magazine because of incompetence, and the magazine predicted early change of the Defense Minister, but, it did not happen. In the failure of submarine tender, Mr. Nakatani was not blamed. So, I think the change of the Defense Minister is normal personnel change in the Cabinet Reshuffle. Of course, if Japan won the tender, Mr. Nakatani could have kept his position, I think. The new Defense Minister, madam hawk is acting energetically including just recent Japan-Australia Defense Ministerial Meeting [1, 2, 3]<br /><br />[1]http://www.mod.go.jp/e/data/photogallery/index.html#meeting_0825 (Home Page, Photo Gallery, Japan-Australia Defense Ministerial Meeting (August 25, 2016, MOD))<br />[2]http://www.mod.go.jp/j/press/youjin/2016/08/25_gaiyo.html (Abstract of Japan-Australia Defense Ministerial Meeting (August 25, 2016, MOD))<br />[3]http://asia.nikkei.com/Politics-Economy/International-Relations/Japan-Australia-to-urge-China-to-comply-with-S.-China-Sea-ruling (Nikkei Asian Review, August 25, 2016 10:13 pm JST)<br />The Japanese and Australian defense ministers agreed Thursday to urge China to comply with an international tribunal ruling that denied Beijing's claims to almost all of the contested South China Sea, Japanese Defense Ministry officials said.<br /><br />Judging from budget status for development of G-RX6, the development has nearly finished and 29SS can equip with G-RXs. I am expecting the 29SS shows much superior performance to current AIP Soryu, because 29SS is 50% expensive than 26SS!<br /><br />Regards<br />S<br /><br />Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-19245896.post-86551786279115472242016-08-27T00:19:44.153+10:002016-08-27T00:19:44.153+10:00Pete:
I wouldn't expect the top speed to be t...Pete:<br /><br />I wouldn't expect the top speed to be that significantly higher on the new design because in addition to using up more power this would require a dramatically more powerful engine as well. You already note the logarithmic relationship of power to speed; this applies even more to the power of the engine than it does to the power storage capacity. High underwater speed in a D/E is only good for running away in a bad situation. Nukes can use it to actually change theaters. D/E designs generally hit a wall of cost-vs-benefit at ~20 knots and I wouldn't expect this to change despite the switch to LIB vice LAB/AIP: fundamentally even a D/E with all its diesels going is generating an order of magnitude less energy than an SSN and they can't afford to waste energy or likely even weight on a 25-30 knot capability.<br /><br />Cheers,<br />JoshJoshnoreply@blogger.com