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Using the Fairing Blocks
Nearly all vessels have some dead-rise angle at the
transducer mounting location. If the thru-hull trans-
ducers were mounted directly to the hull, the sound
beam from the transducer would be tilted off the ver-
tical at the same angle as the dead-rise and would
cause errors in the interpretation of the displayed
picture. To correct this situation, most thru-hull
installations will require the use of fairing blocks to
insure that the transducer is mounted in the proper
orientation..
Two custom-molded fairing blocks for the PC/180
transducers have been included with your system to
make installation as simple as possible.
Measure the dead-rise angle of the hull at the se-
lected mounting location and cut the block to a shape
that fits the exact contour of the hull. After cutting
the fairing block, trial-fit the block to the hull. The
upper part of the block should be inside the hull and
the lower part of the block should be outside the hull
to clamp the assembly in place as shown in the dia-
gram at right.
It is very important that the flat top surface of the
transducer be parallel to the water. Because of the
equipment and skill required, we suggest that your
professional boatyard cut the fairing blocks and in-
stall the transducers.
Fairing Block
(top)
11
One of two trans-
ducer fairing blocks
included with your
PC/180 system.
Threaded
Bronze Stem
Boat's Hull
Fairing Block
(bottom)
Transducer Body
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