Simrad 398445, Руководство по установке, Страница: 55 / 66

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Smooth surface is important
Ensure that the surface of the transducer face, the hull plating and putty around the
transducer is as even and smooth as possible. Obstructions on these surfaces will create
problems with turbulent flow.
Mounting screws or bolts must not be extruding from the transducer or the area immediately
around it. Obstructions on these surfaces will create problems with turbulent flow.
The space around the threaded rods (or mounting bolts) must be filled with a a suitable
compound and/or a locking ring to secure firm installation and a level and smooth surface.
Note
Obstructions on these surfaces will create problems with turbulent flow.
Related topics
Streamlined housing mounted externally on a steel hull, page 41
Streamlined housing mounted externally on a wooden or polyester hull, page 44
Transducer installation under a blister, page 47
Transducer installation using drop keel, page 51
Mounting the transducer on a steel hull, page 26
Mounting the transducer on a wooden or polyester hull, page 28
Mounting the transducer on a blister or drop keel, page 30
Use a suitable toe-in angle
The primary consideration for any transducer installation must be to allow laminar water
flow. In most cases this is achieved by placing the streamlined transducer in parallel with the
keel. However, if the transducer is located close to the bow, it should be mounted with a few
degrees "toe-in" towards the bow.
A Transducer
B
Toe-in angle
C
Keel
The angle must be chosen to allow for most
efficient water flow.
It will vary with the location of the transducer;
the depth below the hull, the distance from the
bow, and the distance to the keel. Typical angles are from 0 to 3° on deplacement hulls. On
planing hulls, the angle is normally close to 0°.
Transducer installation principles