Simrad ES70 - INSTALLATION REV A Installation Manual page 124

Simrad ES70
Smooth surface is important
Mounting screws or bolts must not be extruding from the transducer or the area
immediately around it. Make sure that the surface of the transducer face, the installation
hardware used to mount it, the hull plating and the putty around the transducer is as
even and smooth as possible. Obstructions on these surfaces will create problems with
turbulent flow.
Use a horizontal support bar on large transducers
We strongly recommend that large transducers are fitted with a horizontal support bar.
The purpose of this support bar is to protect the transducer from damage in the event of
slamming. This happens if the vessel hull climbs out of the water in heavy seas. The
force of the water when the hull falls down may push the transducer up and cause damage
to its mounting. The support bar can be secured to the mounting ring using threaded rods.
Slamming is the impact of the bottom structure of a ship onto the sea surface. It
is mainly observed while sailing in waves, when the bow raises from the water
and subsequently impacts on it. Slamming induces extremely high loads to ship
structures and is taken under consideration when designing ships.
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