As an addition to what CapnScurvy mentions, we used several sources for our "historical" use of torpedoes and other equipment, including but not limited to
http://www.combinedfleet.com/kaigun.htm
and of note:
http://www.combinedfleet.com/Kuchikukan.htm
http://www.combinedfleet.com/TokuJunyokan.htm
http://www.combinedfleet.com/kusentei.htm
in addition to other sites. Now, granted, our "balance" needs adjusting in a few areas. ie: We apparently need more airplanes...
In addition, work is being done on several other aspects as found in "Silent Victory" and others of that ilk, for add-in mods for later... Remember, this is still "beta".