Soryu klasse u boot3/31/2023 ![]() Soryu -class SSKs are powered by two Kawasaki 12V 25/25 SB-type diesel engines and four Kawasaki Kockums V4-275R Stirling AIP engines for silent running. ![]() The 4,200-ton (submerged) Soryu -class boats are the JMSDF’s first SSKs to be fitted with air-independent propulsion (AIP) systems, enabling the submarines to stay underwater for up to two weeks. Get briefed on the story of the week, and developing stories to watch across the Asia-Pacific. Soryu-class SSKs are also the first submarines of the JMSDF to be equipped with air-independent systems, as I explained previously: Diplomat Brief Weekly Newsletter N Batteries make less noise than diesel-electric engines and as a result reduce the submarine’s acoustic signature making detection harder. ![]() The new batteries will reportedly enable the submarines to shut off their diesel-electric propulsion and operate on battery power alone for longer periods under water. The Toryu and Oryu, the latter of which launched in October 2018, will both be equipped with lithium-ion batteries making Japan the only known country to have fitted this technology into a submarine. The Toryu is expected to be commissioned in March 2021, with the 11th SSK, the future JS Oryu, to enter service with the Japan Maritime Self Defense (JMSDF) in March 2020. Construction costs of the new submarine are estimated at around $496 million. ![]() The remaining six SSKs of the class were built by Mitsubishi Heavy Industries (MHI). The Toryu, laid down in January 2017, is the sixth Soryu-class SSK and the 28th boat overall to be constructed by KHI since 1945. It is the second Soryu-class SSK equipped with lithium-ion batteries that reportedly store considerably more power than the lead-acid batteries installed on the other 10 boats of the class. Kawasaki Heavy Industries (KHI) has launched the 12th and final Soryu-class diesel-electric attack submarine (SSK), the future JS Toryu (pennant number SS 512), during an official ceremony held at the company’s shipyard in Kobe in Hyogo Prefecture on November 6. ![]()
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