2
Identify Your Model
The model name is printed on the cable tag.
Tools & Materials
Safety glasses
Dust mask
Ear protection
Electric drill
Drill bits and hole saws
Pilot hole
3mm
or
1/8"
Angle finder
Band saw (sharp blade)
Rasp
or
power tool
Sandpaper
Mild household detergent
or
weak solvent (such as alcohol)
File (installation in a metal hull)
Marine sealant (suitable for below waterline)
Slip-joint pliers
Mallet
Grommets (some installations)
Cable ties
Water-based anti-fouling paint (
mandatory in salt water
)
Installation in a cored fiberglass hull (see page 5)
Cylinders, wax, tape, and casting epoxy.
Hull Material
Transducer
Hole-Saw Size
Anti-rotation Bolt Hole
Drill Bit Size
solid fiberglass
or
wood
33mm
or
1-5/16"
14mm
or
9/16"
metal
35mm
or
1-3/8"
15mm
or
9/16"
Hole Saw for
Transducer
(outer skin)
Minimum Size
Hole Saw for
Transducer
(inner cored hull)
Drill Bit for
Anti-rotation Bolt
(outer skin)
Minimum Size
Drill Bit for
Anti-rotation Bolt
(inner cored hull)
33mm
or
1-5/16"
50mm
or
2"
14mm
or
9/16"
30mm
or
1-1/4"
Mounting Location
CAUTION
: Do not mount in line with or near water intake or
discharge openings or behind strakes, struts, fittings, or hull
irregularities that will disturb the water flow.
• The water flowing under the hull must be smooth with a
minimum of bubbles and turbulence (especially at high speeds).
• The transducer’s face must be continuously immersed in water.
• The transducer beam must be unobstructed by the keel or
propeller shaft(s).
• Choose a location away from interference caused by power and
radiation sources such as: the propeller(s) and shaft(s), other
machinery, other echosounders, and other cables. The lower
the noise level, the higher the echosounder gain setting that
can be used.
• Choose a location with a minimum deadrise angle.
• Choose an accessible spot inside the vessel with adequate
space for the height of the stem and tightening the nut.
Boat Types
(Figure 1)
•
Displacement hull powerboat
—Locate 1/3 of the way back
along the LWL and 150–300mm (6–12") off the centerline. The
starboard side of the hull where the propeller blades are moving
downward is preferred.
•
Planing hull powerboat
—Mount well aft near the centerline and
well inboard of the first set of lifting strake
s to insure that it is in
contact with the water at high speeds. The starboard side of the
hull where the propeller blades are moving downward is preferred.
Outboard and I/O
—Mount just forward and to the side of the
engine(s).
Inboard
—Mount well ahead of the propeller(s) and shaft(s).
Stepped hull
—Mount just ahead of the first step.
Boat capable of speeds above 25kn
(29MPH)—Review
transducer location and operating results of similar boats before
proceeding.
Figure 1.
pressure waves
1/3 aft
displacement hull
(6-12")
150-300mm
LWL
Best location for the transducer
(Load Waterline Length)
stepped hull
outboard and I/O
planing hulls
Copyright © 2005 Airmar Technology Corp.
inboard
NOTE: fairing must
be flush with housing
transducer face
hull nut
marine sealant
backing block
Figure 1. Deadrise angle and fairing thickness
High-Performance
hull
stem
aft view
isolation sleeve
min. fairing thickness
74mm (2-7/8")
deadrise
angle
slope of hull
parallel to
water surface
Copyright © 2017 Airmar Technology Corp.
transducer
Fairing
(metal)
