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Simrad 50-7
Retractable transducer
26
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.
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.
D
C
(A) = Transducer
(B) = Trunk
(C) = Transducer shaft
(D) = Transducer shaft sleeve
(E) = Keel
B
E
A
305270/A
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