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Procedure for installing the thru-hull mount transducer
1. With the boat hauled out of the water, mark the location selected
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-
disturbed flow of water around the transducer. The fairing block
should be smaller than the transducer itself to provide a channel
to divert turbulent water around the sides of the transducer rather
than over its face.
Upper
half
Lower
half
Hole for
stuffing tube
BO
W
Saw along slope of hull.
Figure 1-15 Construction of fairing block
3. Drill a hole just large enough to pass the threaded stuffing tube of
the transducer through the hull, making sure it is drilled verti-
cally.
4. Apply a sufficient amount of high quality caulking compound to
the top surface of the transducer, around the threads of the stuff-
ing tube and inside the mounting hole (and fairing blocks if used)
to ensure watertight mounting.
5. Mount the transducer and fairing blocks and tighten the locking
nuts. Be sure that the transducer is properly oriented and its work-
ing face is parallel to the waterline.
Note: Do not over-stress the stuffing tube and locking nuts through
excessive tightening, since the wood block will swell when the boat is
placed in the water. It is suggested that the nut be tightened lightly at
installation and retightened several days after the boat has been
launched.