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1.2 Thru-hull Mount Transducer 520-5PSD, 520-5MSD
Transducer mounting location
This type of mounting provides the best performance of all, since
the transducer protrudes from the hull and the effect of air bubbles
and turbulence near the hull skin is reduced. When the boat has a
keel, the transducer should be at least 30 cm away from it. Typical
thru-hull mountings are shown in the figure on the next page.
The performance of this sounder is directly related to the mount-
ing location of the transducer, especially for high-speed cruising.
The installation should be planned in advance, keeping the stan-
dard cable length (8 m) and the following factors in mind:
• Air bubbles and turbulence caused by movement of the boat
seriously degrade the sounding capability of the transducer. The
transducer should, therefore, be located in a position where wa-
ter flow is the smoothest. Noise from the propellers also ad-
versely affects performance and the transducer should not be
mounted nearby. The lifting strakes are notorious for creating
acoustic noise, and these must be avoided by keeping the trans-
ducer inboard of them.
• The transducer must always remain submerged, even when the
boat is rolling, pitching or up on a plane at high speed.
• A practical choice would be somewhere between 1/3 and 1/2 of
the boat's length from the stern. For planing hulls, a practical
location is generally rather far astern, so that the transducer is
always in water regardless of the planing attitude.
Transducer outline drawings
22
120
30
All dimensions
in millimeters
68
520-5PSD
Figure 1-3 Dimensions of transducers 520-5PSD, 520-5MSD
24
120
28
68
87
520-5MSD
Ship's
bow
3
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