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A practical choice would be somewhere
between 1/3 and 1/2 of the boat’s length
from the stern. For planing hulls, a
practical location is generally rather far
astern, so that the transducer is always in
water regardless of the planing attitude.
28
22
120
68
30
520-5PSD
24
120
68
87
520-5MSD
Unit: mm
Thru-hull mount transducer mounting
dimensions (millimeters)
Acceptable transducer mounting
locations
Position 1/2 to 1/3 of the hull
from stern.
15 to 30 cm off center line
(inside first lifting strakes.)
Within the wetted bottom area
Deadrise angle within 15°
HIGH SPEED-V HULL
Suitable transducer mounting locations
Typical thru-hull mount
transducer installations
Fairing
Block
Flat Washer
Rubber Washer
Hull
Deep-V Hull
Hull
Flat Washer
Rubber
Washer
Flat Hull
Cork
Washer
Typical thru-hull mount
transducer installations
Procedure for installing the
thru-hull mount transducer
1. With the boat hauled out of the water,
mark the location chosen for mounting
the transducer on the bottom of the hull.
2. If the hull is not level within 15° in any
direction, fairing blocks made out of teak
should be used between the transducer
and hull, both inside and outside, to
keep the transducer face parallel with
the water line. Fabricate the fairing
block as shown below and make the
entire surface as smooth as possible to
provide an undisturbed flow of water
around the transducer. The fairing block
should be smaller than the transducer
itself to provide a channel to divert
turbulent water around the sides of the
transducer rather than over its face.