Going off of a previous mod (sorry, cannot recall who it was who came up with it), I updated the text for all the different torpedo types. I originally had more text for each type, but the game crashes beyond a certain number of lines rendered for each section. Nonetheless, the information given is pretty relevant.
Just open your menu.txt file and copy and paste in the following information:
5370=Type: Mark 10|Range: 3,500 yards at 36 knots|Propulsion: Wet-heater|Notes: World War I-era torpedo still used by S-class submarines during World War II.
5371=Type: Mark 14|Range: 4,500 yards at 46 knots OR 9,000 yards at 31 knots|Propulsion: Wet-heater|Notes: Though initially plagued with many problems, it was the standard submarine torpedo of the war.
5372=Type: Mark 16|Range: 13,700 yards at 46 knots|Propulsion: Hydrogen Peroxide|Notes: A high-performance but high-cost torpedo. Not used during the war but remained in service until the mid-1970s.
5373=Type: Mark 18|Range: 4,000 yards at 29 knots|Propulsion: Electric-Battery|Notes: The Westinghouse version of a British-captured German G7e. By war's end, it made up 65 percent of all torpedoes fired by American submarines.
5374=Type: Mark 23|Range: 4,500 yards at 46 knots|Propulsion: Wet-heater|Notes: Identical to the Mark 14 without the 31-knot setting. In service 1943-1946.
5375=Type: Mark 27|Range: 5,000 yards at 12 knots|Propulsion: Battery|Notes: A variation of the airborne Mark 24 adapted for submarine use. It was a passive homing weapon intended for self-defense against ASW escorts.
Text data adaped from
http://www.navweaps.com