British M class submarine
http://gamecow.egloos.com/
Design
The guns were 12-inch (305 mm) 40 calibre Mark IX guns from spares for the
Formidable-class battleships. The mounting allowed them to elevate by 20 degrees, depress 5 degrees and train 15 degrees in either direction from the centre line. The weapon was normally fired from periscope depth using a simple bead sight on the end of the gun aligned with the target through the periscope at a range of around 1200 metres. The exposure time of the gun above the surface was around 75 seconds. The submarine had to surface to reload the gun, which would take about 3 minutes. In practice the concept was not very successful and only three of the four M-class boats ordered were completed, all between 1917 and 1918. M-class submarines are sometimes called submarine
monitors.
M1 and
M2 also had four 18-inch (450-mm) torpedo tubes whilst
M3 and
M4 had 21-inch (533 mm) diameter tubes and were 3 metres longer to accommodate them.
http://en.wikipedia.org/wiki/British_M_class_submarine
what about modding this one ?
keltos