S-42 is actually just a slight visual modification of the S-18 and shares all the same performance data (just like the Gar shares all performance data with the Tambor).
As for S-boats in general - as I mentioned in the request thread for this, I haven't been able to find any accurate data on the S-boats' submerged performance that is any different from what we get in game, so I left it alone for now. I get the sense that the S-boats are overmodeled (unlike the rest of the boats), but I can't prove it right now...
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