Airmar TRIDUCER DST800L Owner'S Manual & Installation Instructions Download Page 3

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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.

starboard side of hull

Figure 3. Anti-fouling paint

outside wall

paddlewheel

O-ring

below lower

cavity

exposed end

DST800L

insert detail

B122 insert/blanking plug

outside wall
below joint