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Installation in a Cored Fiberglass Hull
The core (wood or foam) must be cut and sealed carefully. The
core must be protected from water seepage, and the hull must be
reinforced to prevent it from crushing under the hull nut, allowing
the transducer to become loose.
CAUTION
: Completely seal the hull to prevent water seepage into
the core.
1. Drill a 3mm or 1/8" pilot hole perpendicular to the waterline from
inside the hull (Figure 4). If there is a rib, strut, or other hull
irregularity near the selected mounting location, drill from the
outside. (If the hole is drilled in the wrong location, drill a second
hole in a better location. Apply masking tape to the outside of the
hull over the incorrect hole and fill it with epoxy.)
2. Using the appropriate size drill bit, cut a hole from outside the
hull through the
outer
skin only.
Be sure to hold the drill plumb,
so the hole will be perpendicular to the water surface.
3. The optimal interior hole diameter is affected by the hull’s
thickness and deadrise angle. It must be large enough in
diameter to allow the core to be completely sealed.
Using the appropriate size drill bit for the hull interior, cut through
the
inner
skin and most of the core from inside the hull keeping
the drill perpendicular to the hull. The core material can be very
soft. Apply only light pressure to the drill bit after cutting through
the
inner
skin to avoid accidentally cutting the
outer
skin.
4. Remove the plug of core material so the
inside
of the outer skin
and the inner core of the hull is fully exposed. Sand and clean
the inner skin, core, and the outer skin around the hole.
5. Coat a hollow or solid cylinder of the correct diameter with wax
and tape it in place. Fill the gap between the cylinder and hull
with casting epoxy. After the epoxy has set, remove the cylinder.
6. Sand and clean the area around the hole, inside and outside, to
ensure that the sealant will adhere properly to the hull. If there is
any petroleum residue inside the hull, remove it with either mild
household detergent or a weak solvent (alcohol) before sanding.
7. Proceed with “Bedding” (page 2).
Anti-fouling Paint
Surfaces exposed to salt water must be coated with anti-fouling
paint. Use
water-based
anti-fouling paint only. Never use ketone-
based paint since ketones can attack many plastics possibly
damaging the transducer. Reapply anti-fouling paint every 6
months or at the beginning of each boating season.
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hull’s outer skin to
hull
outer skin
solid or hollow
cylinder
pour in
casting
epoxy
core
inner skin
Figure 4. Preparing a cored fiberglass hull
dimension equal to
the thickness of the
ensure adequate
clearance
Copyright © 2005 Airmar Technology Corp.
Maintenance, Parts & Replacement
Cleaning
Aquatic growth can accumulate rapidly on the transducer’s
surface reducing its performance within weeks. Clean the surface
with a Scotch-Brite
®
scour pad and mild household detergent
taking care to avoid making scratches. If the fouling is severe,
lightly wet sand with fine grade wet/dry paper.
Replacement Parts
The information needed to order a replacement transducer is
printed on the cable tag. Do not remove this tag. When ordering,
specify the part number, date, and frequency in kHz. For
convenient reference, record this information on the top of page 1.
Lost, broken, and worn parts should be replaced immediately.
Obtain parts from your instrument manufacturer or marine dealer.
Gemeco
USA
Tel: 803-693-0777
email: [email protected]
Airmar EMEA
Europe, Middle East, Africa
Tel: +33.(0)2.23.52.06.48
email: [email protected]
