Airmar B66VL - Manual (Page 3)

Cutting the Standard Fairing
1. Measure the deadrise angle of the hull at the selected location
using a digital level (see Figure 2).
2. Tilt the band saw table to the measured angle and secure the
cutting fence (see Figure 4).
3. Place the fairing on the table, so the cutting guide rests against
the fence. The arrow will point toward you for installation on the
port side and away from you for installation on the starboard
side of the boat (see Figures 4 and 5).
Note: The ARROW always points forward toward the bow. 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.
4. Adjust the cutting fence. The fairing must be between 6–12mm
(1/4–1/2") at its thinnest dimension (see Figure 2).
Warning: Always wear safety goggles and a dust mask.
5. Recheck steps 1 through 4. Then cut the fairing.
6. Shape the fairing to the hull as precisely as possible with a rasp
or power tool.
7. Use the remaining section of the fairing for the backing block.
Bedding the Housing
1. Apply a 2mm (1/16") thick layer of marine sealant over the surface
of the multisensor housing that will contact the fairing (or hull if no
fairing is used) and up the stem, 6mm (1/4") higher than the
combined thickness of the fairing, hull, backing block, and hull nut
(see Figure 3). This will ensure there is marine sealant in the
threads to seal the hull and hold the hull nut securely in place.
2. Slide the fairing (if used) onto the stem and mate the button with
the recess in the housing (see Figure 5).
3. Apply a 2mm (1/16") thick layer of marine sealant to the side of
the fairing (if used) that will contact the hull (see Figure 3).
4. Apply a 2mm (1/16") thick layer of marine sealant to the side of
the backing block (if used) that will contact the hull.
Installing the Housing
Caution: Never strike the multisensor.
1. From outside the hull, push the stem of the multisensor housing
(with the fairing in place if used) through the mounting hole using
a twisting motion to squeeze out excess sealant (see Figure 3).
If an Airmar fairing is used, be sure the button on the fairing is
mated with the recess in the multisensor, the arrow on the fairing
is pointing forward. Take care to align the assembly parallel
to the centerline of the boat (see Figure 5).
2. From inside the hull, slide the backing block (if used), hull nut,
and cap nut along the cable. Slide the backing block onto the
stem and seat it firmly against the hull. Screw the hull nut in
place. Tighten it with slip-joint pliers (see Figure 3).
Wood hull—Allow for the wood to swell.
Caution: Be careful to avoid cross threading the cap nut.
3. Being sure the valve assembly is seated firmly in the housing,
carefully screw the cap nut in place. HAND-TIGHTEN only.
Do not over tighten.
4. Remove any excess sealant on the outside of the fairing and
hull to ensure smooth water flow over the multisensor.
3
Figure 4. Cutting the fairing
cutting
guide
band saw
table
deadrise
angle
end with arrow
for installation
on port side
fence
marine sealant
stem
hull nut
backing
hull
fairing
Figure 3. Drilling and bedding (B744V shown)
cap nut
block
button
Figure 5. Airmar urethane fairing (B744V shown)
BOW ►
6–12mm (1/4–1/2")
backing
hull
fairing
multisensor
deadrise
fairing thickness
angle
slope of hull
parallel to
waterline
block
Figure 2. Deadrise angle & fairing thickness (B744V shown)
at thinnest point
recess in
housing
cutting
guide
AIRMAR ®
AIRMAR ®
AIRMAR ®
AIRMAR ®