Japan’s MoD New Aegis-Equipped Missile Defense Ships May Be Multihulls

May 3, 2021

Naval News:

The Aegis System-equipped ship is designed to replace the Aegis Ashore which saw its deployment canceled in 2020. The Japanese government decided to build the ship in December of the same year, but the details of its performance, such as what kind of equipment it will be equipped with, were to be discussed later.

The multihull proposal originally attracted attention when the Japan Maritime Self-Defense Force (JMSDF) released a document on the design of Aegis system-equipped ships on April 9, which included the requirement to have “experience in the design and manufacture of modern multihulls”. The only Japanese shipbuilder with such experience is Mitsui E&S, which built JMSDF’s Hibiki-class ocean surveillance ships, and which will be integrated into Mitsubishi Heavy Industries.

According to the Yomiuri Shimbun, one of the advantages of multihulls is that they are less susceptible to the effects of waves. And they report that “the structure, which is less likely to be shaken by waves, has the advantage of being suitable for launching missiles”. However, this explanation is questionable. It is true that multihulls are resistant to wave, but this does not have much to do with the suitability of a missile for launch. This is because the existing JMSDF Aegis ships, which are monohull, have no problem at all in launching missiles. Furthermore, the Aegis System-equipped ship is an alternative to Aegis Ashore and is expected to be deployed in coastal waters for long periods of time. Therefore, there should be little need to deploy them in the open sea where the seas are rough. Therefore, there are other reasons why multihulls are being considered for Aegis system equipped ship. The multihull has the advantage of a wider deck than the monohull. Therefore, it is possible to mount large structures…

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