IJN post Taiho fleet carrier plans

goofygoober20000 said:
(Twitter didn't let me translate the text from their platform for some reason)

And it turns out that there is a G15 blueprint?
Click to expand...
I see a mention about Tahio Kai. Here is Taiho Kai, also called G-15:

See here too: https://naval-encyclopedia.com/ww2/japan/taiho.php

I have too this text that I dont remember where I get:

NEVER BUILT 'NEXT' - TAIHO CLASS CARRIERS

By Noriki Suzuki



IJN carriers were very successful in the early stages of the war but were defeated in June 1942 at Midway, when four carriers were lost. So serious was the loss that the IJN modified its wartime supply plan 'Maru-Go' (Circle Five) to 'Kai-Maru-Go' (Revised Circle Five), intending to reinforce its air strike capability. The "Next-TAIHO class carriers" were a part of that plan. TAIHO was the only carrier included in 'Maru-Yon' (Circle Four) shipbuilding plan, featuring heavy armor, quite untypical for traditional IJN carriers.

The 'Next-TAIHO' class carrier was to be a larger, advanced version of TAIHO. TAIHO's displacement was 34,200 tons (trials); 'Next-TAIHO' was to be 35,800 tons and 4 meters longer. TAIHO's flight deck length was 257.5 meters and 'Next-TAIHO' 261.5 meters. TAIHO had six 100mm twin AA guns Type 98; 'Next-TAIHO' was designed to have eight Type 98s as suggested by TAIHO gun crews.

Another improvement was the revised anti-torpedo protection. Recognizing the development of enemy torpedo power, 'Next-TAIHO' had a well-designed under-water protection structure, enough to withstand a 350kg torpedo explosion. Again learning from Midway the electrically powered bucket chain hoists for bombs and torpedoes, connected flight deck and magazine directly. According to Revised Circle Five plan, the 'Next-TAIHO' was designed under basic design G-15.

The plan was to build five of these ships, numbered 5021 to 5025 at the following shipyards:



No.5021 at Kure Navy Yard

No.5022 at Kawasaki Kobe Yard//

No.5023 at Mitsubishi Nagasaki Yard//

No.5024 at Yokosuka Navy Yard

No.5025 at Kure Navy Yard.



However, the war situation prohibited building such high-quality giant flattops that needed too much tooling. Mass-produced medium carriers, with lesser attack capability but needing less building work were required. Therefore IJN authorities decided to build the UNRYU class prior to 'next-TAIHO' according to the same Revised Circle Five plan. UNRYU's design was based on HIRYU but featured some improvements. With the worsening war situation, the shortage of materials prevented any ship keel lay and abandoned their building.



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