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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 undisturbed 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 trans-
ducer through the hull, making sure it is drilled vertically.
4. Apply a sufficient amount of high quality caulking compound to the top surface
of the transducer, around the threads of the stuffing tube and inside the mount-
ing 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 working face is parallel to the
waterline.
Note:
Do not over-stress the stuffing tube and locking nuts through excessive tight-
ening, 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.