1. MOUNTING
1-2
1.1 Hull Unit
1.1.1 Installation position of hull unit
Discussion and agreement are required with the dockyard and the ship owner in deciding
the installation position of the hull unit. When deciding the installation position, the following
points should be taken into account.
1) Select an area where propeller noise, cruising noise, bubbles and interference from
turbulence are at a minimum. Generally, the point at 1/3 to 1/2 of the ship’s length from
the bow on or near the keel is optimum. On-the-keel installation is advantageous for
minimizing oil consumption in comparison with off-the-keel. In case the hull unit cannot
be installed on the keel, the center of the retraction tank should be within 1 m of the keel
so as to prevent a rolling effect.
1/2 1/3
Within 1 m
Installation position of hull unit
2) Select a place where interference from other equipment is minimal. The hull unit should
be at least 2.5 m away from the transducers of other equipment.
3) An obstacle in the fore direction not only causes shadow zone but also aerated water,
resulting in poor sonar performance.
4) The following space is required around the hull unit for wiring and maintenance. If the
ambient temperature of the unit is below 0°C, the sonar compartment must be provided
with a heater so as to keep the temperature above 0°C.
BOW
400800
400 800
45
Sonar room
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