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1. MOUNTING
1.3.1
Thru-hull mount
520-PLD
For details of the installation, see the transducer manual.
Transducer mounting location (for 520-5PSD/520-5MSD)
The thru-hull mount transducer provides the best performance of all, since the trans-
ducer 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.
The performance of this fish finder is directly related to the mounting location of the
transducer, especially for high-speed cruising. The installation should be planned in
advance, keeping the length of the transducer cable 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 water flow is the smoothest.
• Noise from the propellers adversely 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 sub-
merged, even when the boat is rolling, pitch-
ing or up on a plane at high speed.
• A practical choice would be some-
where 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 re-
gardless of the planing attitude.
Procedure for installation of the
thru-hull mount transducer (for
520-5PSD/520-5MSD)
1. With the boat hauled out of the wa-
ter, mark the location chosen for
mounting the transducer on the
bottom of the hull.
2. If the hull is not level within 15° in
any direction, fairing blocks made
out of teak should be used be-
tween the transducer and hull, both inside and outside, to keep the transducer
face parallel with the water line. Fabricate the fairing block as shown in the follow-
ing figure and make the entire surface as smooth as possible to provide an undis-
22
120
30
68
520-5PSD
Position 1/2 to 1/3 of the hull from stern.
z
15 to 30 cm off center line (inside first lifting
z
strakes.)
Within the wetted bottom area
z
Deadrise angle within 15°
z
9
24
120
28
Unit: mm
68
BOW
87
520-5MSD
DEEP V
HULL
HIGH SPEED
V HULL
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