ORIGINAL: Lokasenna
They cost the same to build (33) as the other IJ subs and the Rule of Cool. The I-400s carry 3 float planes and come equipped with radars. They also have 8 tubes in the front, but that's less important than their 31000 Endurance. Yes, 31000. They can stay out forever. They also use less fuel for this Endurance (Tracker says 900 Fuel full load, compared to your other Glen subs that carry 827 Fuel to go 14000 Endurance - pretty much double the fuel efficiency).
I would argue that the other float plane boats are worth building as well, at least some of them, as you're bound to lose them throughout the war. And their recon/search abilities are very useful.
I agree with A/B/AM types (the ones with floatplanes) being usefull, but feel that I-400 is waste of resources and was just wondering if there was any special use for them that I had missed.
In my experience the planes on Sen Tokus don't get any more air time than Glens on A/B types - which means almost never. As for the Rule of Cool, that I get (as my nick states), but game wise I-400 boats have durability of smaller A/B/C type boats, but are far less agile thus being hit by every DE in game with full complement of DC's. And suberb range is hardly needed in 1944 as enemy is on the next island.
If you got extra NavSy points and want to accel some subs, I think I-201 (Sen Taka) class would be better bet. Best Mvr rating of any sub in the game and more durable than A/B/C or Sen Toku. Range limited, but 8000 is still enough to hunt anywhere in Pacific. Most importantly type can still do some damage even against heavy US ASW defences and comes with two radars. Also Ha-200 (STS type) is worth taking a look.




