Simrad ES38-10 - REV B, Installation Manual, Page: 27 / 52

Ways of mounting the transducer
Drop keel
The use of a drop keel with the purpose of stabilising the vessel
is well known.
A drop keel is also a superior platform for echo sounder
transducers. Such instrument keels have been built, mainly on
research vessels, often protruding as far as three meters below
the hull. At that depth, the water is free of air bubbles up to
very high sea states. The vessel is then able to perform reliable
acoustic measurements in open sea a larger part of the year.
(CD017012D)
B
C
A
(A) = Instrument keel shaft
(B) = Lowered position
(C) = Bottom view
305176/A
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