The Probert Encyclopaedia of Ships

U-9

U-9 was a German coastal submarine of 250 tons displacement launched in 1935. She had a top speed of 13 knots surfaced, 7 knots submerged, could dive to 50 fathoms and carried a complement of 23. Armaments consisted of one 1 pdr anti-aircraft guns and three 21 inch torpedo tubes.
Research U-9