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WARNING
DO NOT install a bronze transducer
housing directly into an aluminum or steel
hull because electrolytic corrosion will
occur.
Fairing Block Before Cutting
On inboards always mount the transducer well
ahead of the propeller(s). Turbulence from props
can seriously degrade performance.
d. Mount the transducer on the side of the hull
where the propeller is moving downwards. The
upward motion of the propeller generates pres-
sure waves and pushes bubbles up against the
hull.
IMPORTANT:
1)
Make sure the water flow across the thru-hull
transducer is free of bubbles and turbulence at
all speeds if good performance is to be achieved.
2)
Make sure the transducer has an unobstructed
view of the water ahead and below the boat.
3)
On displacement-hull power boats, the trans-
ducer should be mounted relatively close to the
center line of the hull.
4)
Mount the transducer in a place which has rea-
sonable access from inside the vessel since the
transducer's bronze nut will require tightening
from inside the hull.
The transducer must be mounted so that it's bronze
stem is as perpendicular to the water line as possible.
If necessary, use a fairing block to properly position
the transducer.
Using a Fairing Block
Nearly all vessels have some dead-rise angle at the
transducer mounting location. If the thru-hull trans-
ducer were mounted directly to the hull, the sound
beam would be tilted off the vertical at the same an-
KEY -
gle as the dead-rise. Most thru-hull installations will
matches hole
require a fairing block to insure the transducer is
in
mounted properly.
transducer's
A fairing block is typically made of teak or ma-
body (keeps
hogany wood or plastic and should be glued between
transducer
the transducer and the hull (both inside and outside)
properly
to insure that the transducer's mounting shaft is per-
positioned)
pendicular to the water's surface. Make the fairing
block as smooth as possible, and not bigger than the
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