For the purpose of these Performance standards, the following
definitions apply:
-
.1
Rolling is the motion around the
longitudinal axis of the ship;
-
.2
Actual heel angle is the momentary
angle of roll referenced to a levelled ship to port or starboard side;
-
.3
Roll period is the time between
two successive maximum values of heel angle on the same side of the
ship; and
-
.4
Roll amplitude is the maximum
values of heel angle to port or starboard side.