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And when not in operation, the tunnel creates turbulence. If your vessel is pitching, the
tunnel may be filled with air or aerated water in the upper position and release this in
the lower position.
In general, all transducers should therefore be placed well away from the bow thruster(s).
In most cases, a location forward of the bow thruster is advantageous.
However, this is not an invariable rule. Certain thruster designs combined with their
physical locations on the hull may still offer suitable locations near the thruster. If you
are in doubt, consult a naval architect.
Summary and general recommendations
Some of the installation guidelines provided for transducers may be conflicting. For this
reason, each vessel must be treated individually in order to find the best compromise.
In general, the most important factor is to avoid air bubbles in front of the transducer
face. For this reason, the recommended transducer location is normally in the fore part of
the hull, well ahead of the noise created by the bow wave. The maximum distance from
the bow is normally equal to one third of the total water line length of the hull.
If the vessel hull has a bulbous bow, this may well be a good transducer location, but also
in this case the flow pattern of the aerated water must be taken into consideration. Often
the foremost part of the bulb is preferable.
This applies to the vessel in normal trim and speed.
Important
Under no circumstances should the transducer be tilted backwards when the vessel
is moving at an appreciable speed. Mounting screws must never be extruding from
the transducer, and the space around the screws must be filled with a compound or a
locking ring.
Summary of Contents for Simrad SN90
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