have a solvent base. However, some solvent bases will damage
encapsulation materials and plastics to varying degrees. If you need
anti-fouling protection, use only paints with a mineral spirits base; do
not use acetone vinyl-based paints. Glochester (RULE) Durapoxy is a
hard, mineral spirits-based paint that has been found to be virtually
transparent to acoustic energy. Never apply paint to the transducer by
spraying; use a brush or roller. A sprayed surface “wets” very slowly,
and there are often microscopic air pockets under the surface which
attenuate the sound energy.
THROUGH-THE-HULL TRANSDUCERS
The two most popular styles of Through-the-Hull Transducers produced
are low profile types, which typically are 1-3/4" or 2" in diameter, or
stem-type transducers, which typically have a 3/4" pipe thread and
require a fairing block to level. The two most popular materials used are
nylon and bronze. Choice of material depends upon the boat
construction:
Wooden boats require the use of a bronze transducer or bronze
fittings because when the boat is out of the water, the wood will
dry out. When the fitting is installed and the boat is returned to
the water, the wood will swell and possibly crack a nylon type of
transducer. Therefore, bronze is recommended for all wooden
boat applications.
Larger fiberglass boat manufacturers often request bronze
transducers and fittings due to the size of the boat and the total
number of fittings used in the installation. However, nylon
transducers are better suited for this application because of their
ease of installation, lower cost, and more complete seal to the
fiberglass hull.
Selecting an Installation Location
The mounting location must provide a smooth flow of water over the face
of the transmitting surface of the transducer. Bubbles will cause the
instrument to read improperly and cause erroneous readings. The
mounting location should have reasonable access from inside the vessel
since the transducer will require tightening from inside the hull.
•
On sailboats, mount the transducer where the acoustic beam will
not be shaded by the keel. A spot forward of a fin keel with a
minimum deadrise angle is preferred.
•
On planing powerboats, locate the transducer off centerline 6" to
12" and before the first lifting strake (flat area).
8
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