cpt 120 transducer

[miketcook1953]

when installing the transducer, is it necessary to use the plastic speed block?

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Mike,

Should a transducer be designed for use with a fairing/mounting block, then it is important to ensure that this fairing/mounting not only installed, but has been installed properly to ensure that
- the transducer's transmitted energy will be directed downward and perpendicular to the water's surface, and that
- the flow of water across the face of the transducer is not aerated, as would happen when a fast moving flow of water interacts with the relatively blunt leading edge of the transducer.

[miketcook1953]

thanks for the quick answer. Mike

[Chuck - Raymarine - Moderator]

You're welcome.

[miketcook1953]

Would the high speed fairing be necessary on an island packet 38. The less protruding from my hull would seem better. Just curious

[Chuck - Raymarine - Moderator]

Mike,

It is recommended that the high speed fairing be installed in all instances except for those in which a custom pocket exactly matching the shape of the transducer has been created in the hull. The key in ensuring performance of the transducer is to ensure that that the transducer is facing downward and has been faired to ensure a non-aerated flow of water across its face.