Well , I told you that those troop facilities take up space
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Nevertheless , this is very interesting development , unlike 22DDH 26DDH looks like true aircraft carrier and I don't think China would allow that . My prediction - if Japans starts construction of these ships China would attempt to trigger sell-off of Japanese bonds or something similar . We shall see ...
Well, you will note that these vessels would be 3,000 tons less than the Kaga (22DDH) vessels, and yet will hold more aircraft. The displacement was not the issue in whether it could hold the aircraft or not...it is just allowing them to open up more space for them. I honestly think that this vessel is going to be very close to what a Kaga (22DDH) vessel is, but with an extended flight deck, and probably a longer hanger too.
Also with somewhat more defensive weaponry.
Finally, with only a 12 F-35B capability, I believe it is clear that this vessel's role is not an offensive one. It seems like they are designing it so they can use it to defend their ASW Tasf Force carriers when they are out to sea...so they will be able to keep it within their Self-Defense constituional limits with such a strategy.
As to how China will respond, I seriously doubt that they will start a full fledged economic/trade war over such an occurrance. These carriers simply do not have enough power projection to warrant it. Since they intend one for each of their destroyer flotillas, it further underscores their intended use to defend their principal ASW vessels.
In other words, they will probably use these to escort a Hyuga or a Kaga class DDH which are loaded with ASW helicopters to perform ASW screening for allied task forces so that when far out to sea, away from the Japanes Self Defence Air Force coverage, they can still protect those ASW task forces from arial attack.
Anyhow, right now it is a proposal for planning purposes and will not become reality in the least until funding is actually reserved for it.