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13. INSTALLATION
13-3
in a position where water 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 transducer 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 your 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 mounting locations
Installation procedure
1. With the boat hauled out of the water, 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 between the transducer and hull, both inside and outside, to keep
the transducer face parallel with the water line. Fabricate the fairing block as
shown below and make the entire surface as smooth as possible to provide an un-
28
22
120
68
30
24
120
68
87
Unit: mm
520-5PSD
520-5MSD
BOW
Within the wetted bottom area
Deadrise angle within 15°
Position 1/2 to 1/3 of the hull from stern.
15 to 30 cm off center line (inside first lifting
strakes.)
DEEP V
HULL
HIGH SPEED
V HULL
137


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