Thanks, Sorry about the length, Im a bit of a technical nerd.
Good question, why not all Mk10s. Well it seems that when I refit and select Mk10s that the next time I return to port there are not as many Mk10s left. So I am assuming (and we all know what that means) that the supply is limited. Dont want to use them all up at once. Plus you might tick off the pig boat capns, and remember they DON'T have ice cream makers so there always in a bad mood
True the Mk 10 is more reliable but it also has a smaller warhead (500lbs) the Mk 14s have, and my mind is failing me either 800 or 900lb warhead. So a Mk 10 is a little over half as powerfull.
Now here is where "Stinky Logic" comes in:
Gato sub can carry 24 fish. So if you carry only mk 14 you are carrying a little over 19,000 lbs of explosive. Now if you go with avg failure rate of 50% you are really only delivering about 9500 lbs of explosives to Mr. Tojo. Could be more or less depends on batch of fish. But 12 duds can really be a morale breaker, and a bad day at the office if it happens at the wrong time
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Now if you carry half and half, 12 mk 10s = 6000lbs of explosive force. 12 Mk 14s are about 9500 lbs, then avg out the 50% failure your delivering about 4800lbs. So now with a half and half load your only avering about 6 dud vs 12 duds and your delivering almost 11,000lbs of trouble for the imperial navy vs 9500lbs with the Mk 14.
Also Mk 14s can be handy little fish if you can see the bad guys in the harbor but can't get in close enough to use a Mk10. Set em to run slow and they will go all day. (actually 9000yrds which gives you almost 9 minutes to get somewere safe.) Wake Island is a good example, to use the Mk 10s you got to get right up under the bulldogs nose. But with the Mk14 you can stand back across the street and toss a few his way and be at a safe depth by the time he figures out what is going on.
Hope that helps.
Good Luck and Good Hunting!
Capn_Sinky (aka Stinky)
O.I.C.I.C.
Officer In Charge of Ice Cream
USS Drum