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3-1
3. MOUNTING THE EQUIPMENT
3.1 Mounting the Hull Unit and Receiver Unit
Location of hull unit
Determine the mounting location through consultation with the shipyard and shipowner. When
deciding the location, consider the following points:
• Select an area where propeller noise, cruising noise, air bubbles and interference from turbu-
lence are minimal. 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 con-
sumption in comparison with off-the-keel. If the hull unit can not be installed on the keel, the
center of the retraction tank should be within 600 mm of the keel to prevent a rolling effect.
Within 600 mm
1/3 1/2
Figure 3-1 Hull unit mounting location
• Select a place where the hull bottom is flat and the draft is sufficiently deep. Normally, the
transducer should protrude at least 500 mm beyond the keel to minimize the effect of air
foam and bubbles.
• Select a place where interference from other equipment is minimal. Locate the hull unit at
least 2.5 m away from the transducers of other equipment.
• No obstacle should be in the fore direction since it causes a shadow zone and aerated water,
resulting in poor sonar performance.
• Secure sufficient space for wiring and maintenance. Refer to the hull unit outline drawing
for recommended wiring and maintenance space.
• If the ambient temperature of the hull unit is below 0°C, provide the sonar compartment with
a heater to keep the temperature above 0°C.