The prototype for the sonar system was developed between 2010 to 2013 and tested between 2013 to 2014. A total of ¥1.2 billion were used to research the new hull design, while ¥5.1 billion were used to research the sonar system.
Prototyping occurs between 2019 to 2022 and in-house testing to simulate the installation on a submarine occurs in 2023. A total of ¥4.4 billion are used in its development. The reason for the change is due to the need to acquire a dedicated test submarine instead of pulling an ordinary submarine from its operations to conduct tests. III AIP system, which was installed aboard the first 10 Sōryū-class submarines. However both engines were deemed to output below required performance and thus the development of a new power generation system was initiated. The first project aims to develop a new sonar array with improvements in weight reduction, power saving and detection ability in response to improved quietness of future ships and submarines. However, the Japanese defense ministry decided this would be excessively expensive and time-consuming to develop. The lead ship is estimated to cost 76 billion yen ($710 million) and will likely serve primarily for testing and development purposes.
The project aims to improve the efficiency and energy of the power storage and supply system by achieving high efficiency and miniaturization in the power supply system and increasing the capacity and density of the power storage system. But once a LIB-only sub exhausts its battery, it must surface or use its snorkel to suck in more air to run its diesel engines—during which time it will be much more vulnerable to attack. In June 2019, submarine manufacturer Mitsubishi Heavy Industries hosted a presentation (subsequently shared on Twitter) revealing plans for Japan’s next-generation submarine, dubbed the 29SS or “New 3,000- [metric] ton Submarine.” This first appeared in July 2019 and is being reposted due to reader interest. , The hull design of the Taigei-class is said to not differ too much from the Sōryū-class but will be 100 tons heavier than its predecessor. A total of ¥800 million were used to fund project. This first appeared in July 2019. The technical data obtained would be used to aid in the design and construction of the new submarine class. The Taigei is a 3,000-ton diesel-electric attack submarine measuring 84 meters (275 feet, 7 inches) long. MHI Just Launched the First of the New Taigei-class Submarines for JMSDF. Unlike earlier Soryu boats, the final flight has swapped out its air-independent propulsion system for long-lasting lithium-ion batteries (LIBs)—a larger-scale, ruggedized adaptation of the lightweight, high-power-density batteries used in smartphones and laptops. A total of ¥1.3 billion were allocated to fund the snorkel power generation system project and ¥4.9 billion for the sonar system. 10月14日、#岸防衛大臣 は三菱重工業（株）神戸造船所にて、平成29年度計画潜水艦の命名・進水式に出席し、この潜水艦を「たいげい」と命名しました。「たいげい」は「大鯨」と書き、文字通り大きな鯨を意味します。 pic.twitter.com/5XaAhvuPcv. Coates is skeptical that even advanced LIB-equipped submarines will fare well facing Chinese and Russian nuclear-powered submarines. Technically, LIBs could be combined with the AIP system, and indeed Japan reportedly studied possibly developing a Fuel-cell AIP, which is quieter and enables longer endurance than the Stirling AIP on the Soryu. The snorkel power generation prototype was developed between 2010 to 2014 and tested between 2014 to 2015. “…even with LIBs, Japanese and Australian subs will need to loudly snort with supercharged diesel engines every 10 days, thus blowing their residual discretion out of the water.”. The SS-29 class will be built around the extraordinary battery capacity offered by lithium ion batteries (LIB). Likewise, the new AIP systems will allow the submarines to expand their operational areas, including responding in shallow waters. In June 2019, submarine manufacturer Mitsubishi Heavy Industries hosted a presentation (subsequently shared on Twitter) revealing plans for Japan’s next-generation submarine, dubbed the 29SS … The Japanese Maritime Self Defense Force (JMSDF) is planning to increase its submarine fleet to twenty-two operational diesel and AIP-powered submarines, plus one testing and two training submarines.
Research is conducted between 2018 to 2021 and will be tested between 2021 to 2022. The new snorkel power generation system aims to be more compact, quiet and generate higher power output to enhance the submarines operability, survivability and stealth.
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