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Simrad ES38-12
Retractable transducer
Hull units allowing the transducer to be lowered and hoisted are commonly used for
horizontal looking sonars. When not in use, the transducer is retracted into a trunk.
Figure 14 Retractable
transducer
20
A
Transducer
Trunk
B
C
Transducer shaft
D
Transducer shaft sleeve
Keel
E
The retractable hull unit is more expensive than
a blister, but on vessels with a hull where it is
difficult or impossible to install a blister, it may
still be worth while. The principles of a hull unit
with a retractable transducer is shown below.
Vessels without a keel and with a wide, flat bottom
is an example where a retractable hull unit can be
the only acceptable method for bringing the echo
sounder transducer below the boundary layer.
344276/A
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