Link to the modding utility;
https://www.subsim.com/radioroom/dow...o=file&id=4489
In case you want to increase speed or bang. I've been playing with the cutie giving it the same power, speed, and range as the Mark 16, one thing I found is it's best to load them in the aft tubes, select all stop, fire one at a time and wait for it to get a mile away before starting the motors again. Having the stopwatch up is a must, and best to wait one or two minutes between each shot so they don't chase each other. Anything moving slower than 5 knots it will ignore, if you fire at a slow moving ship and a faster one comes near enough it will divert, and firing at something beyond a debris field (after a previous ship has sunk) it will often seek and explode under lifeboats - logic is nearest target making the most noise, splashy oars included.
As for the dates available look for the file;
\Data\UPCData\UPCUnitsData\Ammunition.upc
That's a text file, so can be edited with notepad. Search for;
[Ammunition 13]
ID=Mk27Torpedo
NameDisplayable= Mark 27 Cutie Torpedo
Type= AmmoTorpedo
Subtype=Mk27TorpUS
AmmunitionIntervalOptionCurrent= NULL, NULL, 0
AmmunitionIntervalOptions1=
1944-01-01, 1946-12-31, 500
Volume= 1
PackSize=1
If it's something later than the war start change the starting date;
[Ammunition 13]
ID=Mk27Torpedo
NameDisplayable= Mark 27 Cutie Torpedo
Type= AmmoTorpedo
Subtype=Mk27TorpUS
AmmunitionIntervalOptionCurrent= NULL, NULL, 0
AmmunitionIntervalOptions1=
1941-12-01, 1946-12-31, 500
Volume= 1
PackSize=1
Save, exit, try new career start.
EDIT: Almost forgot, the 500 at the end of the line is the cost in renown for each torpedo, lower that if you want a lot of them at start.