steep deadrise hull
with two transducers
Tools & Materials
Safety glasses
Dust mask
Ear protection
Angle finder (installation with fairing)
Band saw (installation with fairing)
Block of wood (installation with fairing)
min. 4" x 4" x 18"
Screws (4) (installation with fairing)
No. 8
Screwdrivers
Rasp
or
power tool (installation with fairing)
Electric drill
Drill bits and hole saws:
Pilot hole
3mm
or
1/8"
Transducer stem
25mm
or
1"
Anti-rotation studs
in solid fiberglass or wood hull
9mm
or
11/32"
Anti-rotation studs in metal hull
10mm
or
3/8"
Sandpaper
Mild household detergent
or
weak solvent (such as alcohol)
File (installation in metal hull)
Marine sealant (suitable for below waterline)
Slip-joint pliers
Grommet(s) (some installations)
Cable ties
Water-based anti-fouling paint (
mandatory in salt water
)
Installation in a cored fiberglass hull: (see page 8)
Drill bits and hole saws for hull interior:
Transducer stem
38mm
or
1-1/2"
Anti-rotation studs
19mm
or
3/4"
Cylinder, wax, tape, and casting epoxy
Mounting Location
Guidelines
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.
CAUTION
: Do not mount the sensor where the boat may be
supported during trailering, launching, hauling, or storage to avoid
damaging the transducer’s face.
• The water flowing under the hull must be smooth with a
minimum of bubbles and turbulence (especially at high speeds).
• The transducer 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 an accessible spot inside the vessel with adequate
space for the height of the stem and tightening the nuts.
• Choose a location with a minimal deadrise angle. If the hull has
a steep deadrise, mount a pair of transducers.
Boat Types
(Figure 1)
•
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.
•
Displacement hull powerboat
—Locate 1/3 of the way 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.
•
Transducer Pair
—Mount the transducers across from one
another on opposite sides of the centerline (keel).
2
deadrise
slope of hull
parallel to
displacement hull
pressure waves
1/3
(6-12")
150-300mm
LWL
(Load Waterline Length)
angle
waterline
inboard
stepped hull
outboard
Figure 1. Best location
Copyright © 2010 - 2017 Airmar Technology Corp.
and I/O
planing hulls
transducer pair
