U-9 Class
Mittel-U
Large "U-Cruiser"
UB Coastal Attack Class
Another research poll for future modding efforts. Some things to keep in mind:
-UB coastal attack boats often had just two torpedoes, and many lacked a deck gun.
-Many early U-Boats had about the same torpedo loadout of the Type II (6 torpedoes) but one less tube (2 TT).
-In any mod, large U-Boats like U-135 will be very difficult to obtain and will only become available late in the war.
-Most attacks were done on the surface with guns or explosive charges to save torpedoes.