Site preparation
98-150471-A02
Chapter 3: Installation
3-7
Installation
3.2.5
Ship motion and offset from the ship’s motion centre
Even though it is recommended to mount the ADU high, keep the distance between the
ADU and the ship’s motion centre as short as possible. The higher up the ADU is mounted,
the higher is the linear g force applied to the ADU. The g force also depends on the roll
period of the ship, see Table 3-1. If the g force applied is too high, performance and ADU
signal stabilization may be reduced and eventually the ADU may be damaged. Refer to the
following table for allowed mounting heights above the ship’s motion centre.
Figure 3-5: Maximum distance from the ship’s motion centre (h max)
Min.
roll period
Max. ADU mounting height (h max)
Full performance
Potential risk of damage
4 s
12 m
16 m
6 s
27 m
35 m
8 s
48 m
62 m
10 s
75 m
98 m
Table 3-1: Maximum distance from the ship’s motion center versus
ship’s roll period
KPD[
SAILOR900HP.book Page 7 Monday, July 18, 2016 12:44 PM
