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displacement hull
1/3 aft
LWL
(Load Waterline Length)
outboard and I/O
Figure 1.
Best location for the transducer
Copyright © 2005 Airmar Technology Corp.
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
Hull Material
solid fiberglass or wood
33mm or 1-5/16"
metal
35mm or 1-3/8"
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.
Minimum Size
Hole Saw for
Hole Saw for
Transducer
Transducer
(outer skin)
(inner cored hull)
33mm or 1-5/16"
50mm or 2"
2
pressure waves
150-300mm
(6-12")
planing hulls
inboard
stepped hull
3mm or 1/8"
Transducer
Anti-rotation Bolt Hole
Hole-Saw Size
Drill Bit Size
14mm or 9/16"
15mm or 9/16"
Minimum Size
Drill Bit for
Drill Bit for
Anti-rotation Bolt
Anti-rotation Bolt
(outer skin)
(inner cored hull)
14mm or 9/16"
30mm or 1-1/4"
stem
hull nut
backing block
isolation sleeve
hull
(metal)
min. fairing thickness
74mm (2-7/8")
High-Performance
Fairing
Figure 1. Deadrise angle and fairing thickness
Copyright © 2017 Airmar Technology Corp.
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 strakes 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.
aft view
slope of hull
deadrise
angle
parallel to
water surface
transducer
marine sealant
NOTE: fairing must
transducer face
be flush with housing
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