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TACTICAL EVOLUTIONS OF THE SUBMARINE 163
In the following diagrams are shown the effectiveness of
the torpedo at different ranges, the limit angle for effective
firing from easy range, and the effect of errors in the esti-
mation of the speed and the course of the enemy.
Effectiveness of torpedo fire from various ranges
a =calculated position of ship @ 4000 yd. torpedo interval
b = " ” ” ” ” 3000 ” ”
c = " ” ” ‘ ” 2000 ” ”
d = ” ” ” ” ” 1000 ” ”
ai =actual position of ship @ 4000 yd. torpedo interval by change of course
bi = ” ” ” ” ” 3000 ” ”
Cl = ” ” " ” ” 2000 ” ”
di = ” ” ” ” ” 1000 ” ”
For night work the submarines remain on the surface
and pursue tactics similar to those of the surface torpedo
craft. It has been satisfactorily demonstrated in many
maneuvers at night that it is extremely difficult to make