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cutting
guide
fence
Figure 3. Cutting the High-Performance Fairing
Copyright © 2005 - 2010 Airmar Technology Corp.
Installation
Cored Fiberglass Hull—Follow separate instructions on page 5.
Hole Drilling: Transducer
1. Drill a 3mm or 1/8" pilot hole perpendicular to the waterline from
inside the hull (Figure 2). If there is a rib, strut or other hull irregularity
near the selected mounting location, drill from the outside.
2. Using the appropriate size drill bit or hole saw, cut a hole from
outside the hull. Be sure to hold the drill plumb, so the hole will
be perpendicular to the water surface.
Cutting the High-Performance Fairing
CAUTION: The end of the fairing with the arrows/triangular
recess always points forward toward the bow when installed. Be
sure to orient the fairing on the band saw, so the angle cut
matches the intended side of the hull and not the mirror image.
1. Measure the deadrise angle of the hull at the selected mounting
location using an angle finder (Figure 2). Check to be sure the
angle does not exceed 20°.
2. Tilt the band saw table to the measured angle and secure the
cutting fence (Figure 3). Do not exceed 20°.
3. Place the fairing on the table, so the cutting guide rests against
the fence (Figure 4). The end with the arrows and triangular
backing
block
marine sealant on following (shown in red):
- transducer, extending above hull nut 1/4" (NOT surface that will touch water)
- fairing that contacts hull
- backing block that contacts hull
- hull nut that contacts backing block
- anti-rotation bolt including bolt head, extending above nut 1/4"
- anti-rotation washer that contacts backing block
- yellow triangular plug: fill hollow half way (NOT curved surface that will touch water)
band saw
table
deadrise
angle
end with arrows and
triangular recess
for installation
on starboard side
of the hull
stem
hull nut
SS542
Figure 5. Bedding and installing in a solid fiberglass or wood hull
Copyright © 2017 Airmar Technology
triangular
recess for
anti-rotation bolt
Figure 4. High-Performance Fairing
Copyright © 2017 Airmar Technology Corp.
recess will be pointing toward you for installation on the
starboard side of the boat or away from you for installation on
the port side.
4. Adjust the cutting fence, so the fairing will be cut in about two equal
parts (Figure 3). The section that will become the fairing must be a
minimum of 74mm (2-7/8") at its thinest dimension (Figure 2).
5. Recheck steps 1 through 4. Then cut the fairing.
6. When the boat is underway, especially at high speeds, water
will enter any gaps and push against the fairing with
considerable force, possibly rotating it. Shape the fairing to the
hull as precisely as possible with a rasp or power tool. If there is
a gap of more than 3mm (1/8"), replace the fairing.
7. Check to be sure the transducer is flush with the fairing. If it is
recessed more than 0.5mm (1/64") inside the fairing, you may
shim the transducer or carefully file/sand the fairing.
8. The remaining section of the fairing with the cutting guide will
be used as the backing block inside the hull. It will provide a
level surface for tightening the nuts.
Hole Drilling: Anti-rotation Bolt
To locate and drill the hole for the anti-rotation bolt, use the fairing
as a guide. This will ensure that the hole is perpendicular to the
waterline and not drilled at the angle of the hull.
anti-rotation
bolt
nut &
washer
triangular plug
with curved
surface facing
outward
Corp.
cutting
guide
►
BOW
NOTE: Be sure
the arrow on the
transducer
points forward
hull
toward the bow.
High-
Performance
Fairing
3
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