3
Installation with Fairing
Hole Drilling: Sensor
Cored fiberglass hull
—Follow separate instructions on page 7.
1. Drill a 3mm or 1/8" pilot hole perpendicular to the waterline from
inside the hull. If there is a rib, strut, or other hull irregularity near
the selected mounting location, drill from the outside.
2. Using the 51mm or 2" hole saw, cut a hole from outside the
boat (Figure 2). Be sure to hold the drill plumb, so the hole will
be perpendicular to the water surface.
Cutting the 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.
CAUTION
: The housing must be flush with the fairing for smooth
water flow under the sensor.
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 the 28° maximum allowed.
2. Tilt the band saw table to the measured angle and secure the
cutting fence (Figure 4).
3. Place the fairing on the table so the cutting guide rests against
the fence (Figures 4 and 5). The end with the triangular recess
will be pointing
toward
you for installation on the starboard side
of the boat or pointing
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. The section that will become the fairing must be a
minimum of 13mm (1/2") at its thinnest dimension (Figure 2).
Cutting the fairing at an angle greater than 28° will cut into the
sensor and/or bolt pocket, thus weakening the fairing.
5. Recheck steps 1 through 4. Then cut the fairing.
6. When the boat is underway, especially at high speeds, water
will enter gaps and push against the fairing with considerable
force. 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 housing is flush with the fairing. If it is
recessed more that 0.5mm (1/64") inside the fairing, you may
shim the housing or carefully file/sand the fairing.
8. Use the remaining section of the fairing with the cutting guide
for the backing block.
Figure 4. Cutting the fairing
deadrise
angle
cutting
guide
cutting
band saw
table
end with arrow
and triangular recess
for installation on
fence
triangular
recess for
anti-rotation bolt
cutting
guide
Figure 5. High-performance fairing
WARNING
Installation of the anti-rotation bolt is mandatory in a High-Performance Fairing!
Failure to install the anti-rotation bolt may result in the fairing rotating while the boat is
underway. The effect may be violent movement and loss of steering. This could result in
serious injury or death to passengers and/or damage to the boat or other property.
Copyright © 2006 Airmar Technology Corp.
Copyright © 2006 Airmar Technology Corp.
starboard side of hull
Figure 3. Anti-fouling paint
Copyright © 2001 - 2018 Airmar Technology Corp.
outside wall
paddlewheel
paddlewheel
O-ring
below lower
cavity
exposed end
DST800L
insert detail
B122 insert/blanking plug
outside wall
below joint
exposed end
exterior flange
bore up 30mm (1-1/4")
housing
