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Preparing the Hull
Preparing a Cored Fiberglass Hull
You must use the included anti-rotation bolt. Failure to do so could result in the transducer rotating while the
boat is moving and could cause damage to your vessel.
Before you drill holes in the hull, you should cut the fairing block
1 Select a mounting location without surface irregularities or obstructions.
2 Using the faring block as a template, mark the locations of the stem hole and anti-rotation bolt hole.
The arrows on the fairing block and transducer must point to the front of the vessel so the transducer aligns
with the vessel heading.
3 From outside the hull, drill a 3 mm (
perpendicular to the water surface.
4 Place masking tape over the pilot hole and surrounding area outside the hull to reduce cracking of the gel
coat.
5
5 Use a 42 mm (1
/
in.) spade bit or hole saw to cut the stem hole
8
and the core
perpendicular to the water surface.
TIP: Running the hole saw in reverse helps to prevent damage to the fiberglass gel coat.
6 Remove the plug of core material from the hole.
7 Sand and clean the inner skin, core, and outer skin around the hole.
8 Test fit the transducer to verify the marked location of the anti-rotation bolt hole.
If the marked location does not align with the anti-rotation bolt hole on the transducer, mark the new
location.
11
9 Use a 18 mm (
/
in.) drill bit to drill the anti-rotation bolt hole completely through the hull perpendicular to
16
the water surface.
10 Sand and clean the area around the holes to remove dust particles.
11 Seal the exposed inner core with marine grade fiberglass epoxy resin
the transducer in the hull.
You must carefully seal the core to protect against water seepage.
NOTICE
1
/
in.) pilot hole at the stem hole location completely through the hull
8
NOTICE
(Cutting the Fairing Block,
through the outer skin
and allow it to cure before securing
page 4).
, inner skin
,
5
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