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ers. The sonar signal must pass through solid fiberglass. A successful
transducer installation can be made on hulls with flotation materials
(such as plywood, balsa wood or foam) between layers of fiberglass if
the material is removed from the chosen area. See the figure below.
WARNING:
Do not remove any material from your inner hull unless
you know the hull's composition. Careless grinding or
cutting on your hull can result in damage that could
sink your boat. Contact your boat dealer or manufactur-
er to confirm your hull specifications.
Epoxy the transducer to a solid portion of the hull.
For example, some (but not all) manufacturers use a layer of fiberglass,
then a core of balsa wood, finishing with an outer layer of fiberglass.
Removing the inner layer of fiberglass and the balsa wood core exposes
the outer layer of fiberglass. The transducer can then be epoxied direct-
ly to the outer layer of fiberglass. After the epoxy cures for 24 hours, fill
the remaining space with polyester resin. When the job is finished, the
hull is watertight and structurally sound. Remember, the sonar signal
must pass through
solid
fiberglass. Any air bubbles in the fiberglass or
the epoxy will reduce or eliminate the sonar signals.
Shoot-thru-hull transducer locations for
high speed or trolling speed operation.
Inner hull
Epoxy to hull first
Outer hull
Flotation material
Transducer location (trolling speed)
Transducer location (high speed)
Fill with resin
Fill with resin
