Ah!
Well, as I said, my main interest is aircraft and aviation in general, and conformal fuel tanks and sensor packages are becoming more common there. It just made sense to me to have something similar under water.
Carefully designed, CFTs only add around half the wetted area compared to a pylon-mounted drop tank of the same volume. In addition to that, they free up pylons for missiles and bombs.
For a sub, I figure faster reloading and an increased load capacity would be the main advantage. Having torps in long tubes that are already flooded, outside the pressure hull, would make for quieter launches. I don't know if it's possible, but gently pushing a torpedo out, then have it "hover" silently until the launching boat quietly swims away to a safe distance, would allow very stealthy engagements.
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