Back on topic, stock mark 14 damage radius is 3 to 7 meters, so max hole size about 40 feet. Lowest yield "bang for your buck" mod is 125%, 8.75 meters max, so a hole about 50 feet in diameter.
While hacking the campaign EastAsiaCampaign.mis (the one with all them drunken lubbers in the mini troopships that run around in circles) I added my own task force with a Yamato escorted by 6 destroyers, running a pattern around the Philippines. Good way to test the damage effects, since I made the mod I know where and when to intercept on each patrol.
Usually it takes 8 to 12 of the UStorp125 mod mark 14s to sink Yamato, but it is random chance. Usually I set up at a 45 degree angle to the track facing away from the track so I can fire the stern tubes first, then go to full speed and turn into the track to fire the bow tubes. On one attack I hit the "sweet spot" with the second fish, between the two forward turrets, setting off a huge secondary in the main forward magazine which blew the whole thing up so I didn't need to use the bow tubes at all. Most recent attack I had no luck at all - 8 hits (sargo with 4 bow and 4 stern tubes) then dive deep to reload, 8 more hits, more reloading, then two more. Total of 18 fish required that time, pretty close to realistic in my opinion.
Sometimes a single hit will sink a Takao heavy cruiser, usually 2 hits are enough, sometimes 4 or even 5 are needed. The random chance subroutine is actually pretty realistic.
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