New subs don't cost you renown in SH4, as far as I know. They're just randomly offered at the end of a patrol if one is available. However, if you're in May of '42, within the next couple of months you should be able to "buy" some surface search radar for your boat. Regardless, I'd stockpile the renown if you don't need it. Mk 27 torps are 500 each, and when they become available it's a good thing to have 1-2 on the boat, but that gets expensive after a while.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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