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66
Service Manual
Third edition, June 1997
5.8.2 Adjusting the Trim/List Unit
1. Measure the trim and list angles of the ship.
A ship´s trim is the difference between the draft forward and
draft aft. The trim-angle is defined as β in the figure.
D
A
- D
F
tan β =
L
where:
D
A
= draft aft,
D
F
= draft fore,
L = Length between scales.
Note: Aft trim is positive and forward trim is negative.
The list angle can be established by hand dipping towards
the water surface from port and starboard rails. The list angle
δ is calculated by:
h
s
- h
p
tan δ =
w
where:
h
p
= port dipping distance,
h
s
= starboard dipping distance,
w = ship´s width at the dipping point.
Note: For Saab TankRadar, the list angle is considered positive for
port list; conversely, it is negative for starboard list.
β
–
+
Positive trim
D
F
L
FORE
D
A
AFT
hp
Port
Star-
board
w
δ
–
+
Positive list
hs
Figure 5-6. Trim and list
definitions.