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1. INSTALLATION
1-8
Installing the thru-hull mount transducer
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 neat the hull skin is reduced.
When the boat has a keel, the transducer should be at least 30 cm away from it. Typical
through hull mountings are shown in the figure on the next page.
The performance of the video sounder is directly related to the mounting location of the
transducer, especially for high-speed cruising. The installation should be planned in
advance, keeping the standard 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 water flow is the smoothest. Noise from the propellers also 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
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 the boat’s length from the
stern. For planning hulls, a practical location is generally rather far astern, so that the
transducer is always in water regardless of the planning attitude.
Transducer outline drawings
22
120
30
68 87
68
120
28
24
520-5PSD (option) 520-5MSD (option)
Ship's
bow
All dimensions
in millimeters
Transducer outline drawings