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Originally Posted by copeab
(and yes, this combination does mean aircraft-carrying subs)
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The IJN had a few.
I-400 class.
Quote:
Originally Posted by copeab
I'm aiming for a pulp setting, circa 1930-1945 technology.
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the third thing is a power source better than the diesel-electric subs had.
A nuclear plant is probably your best bet. They could have been done with WWI era tech, if the theory had been known; no new devices were needed to do it.
Sub-to-sub warfare was typically at surface, mostly using deck guns. (Which many subs of the era did have.) Torpedoes could also be used; many were unguided, and some were wire guided.