Roger53, et al:

The first salvo from the 203mm turret could only be fired 4-1/2 minutes after
surfacing. The turret lacked power to overcome the joints' efforts and could not
be trained if the roll exceeded 8 degrees (thus the recommended limitation of
+/-15 degrees on each side if the sea was not still) the fire control set (telepointer + electromechanical computer)was optimized for ranges up to 1200m,
however, fire was possible up to 1600m using the periscope for greater ranges (the
guns could fire at 2600m at max elevation). The plane was required to spot the
splashes. The turret had no continuous remote control and could not follow the
target automatically. The practical number of salvos was limited to 14 consecutive
ones (28 shells in the hoisting chain) Reloading the hoisting chain from the wells left the sub exposed on the surface for too long.

Hope this info helps,

ROBERT M.