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submerged, even when the boat is
rolling, pitching or up on a plane at
high speed.
• 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 dimensions
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.