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Author Topic:   Reducing Spray from Transom-mounted SONAR Transducer
Tim S posted 06-28-2013 10:38 AM ET (US)   Profile for Tim S   Send Email to Tim S  
[This author says he has] just mounted a transducer from my new Lowrance unit on my Dauntless 16. When the boat is up on a plane there is a ton of water spray coming from the transducer that bounces [onto] the engine cover. Is the transducer mounted too low? Or, too high? Or, is spray normal? Is the transducer meant to be fully submerged in the water [when the boat is on plane]? Or, [is the transducer meant to] ride just out of the water?


jlh49 posted 06-28-2013 10:51 AM ET (US)     Profile for jlh49  Send Email to jlh49     
I would say "too low." Go to the link below and I believe it is a good source with regard to your question. Good luck!

jimh posted 06-28-2013 12:32 PM ET (US)     Profile for jimh  Send Email to jimh     
Please use SMALL BOAT ELECTICAL for questions about SONAR.

Too much spray usually means too much immersion.

jimh posted 07-01-2013 11:23 AM ET (US)     Profile for jimh  Send Email to jimh     
A SONAR transducer cannot operate if the transducer is not immersed in the water. Any air or even aerated water flowing past the active surface of the SONAR transducer will cause the sound signals to be attenuated, and the sensitivity of the system will be greatly reduced. The active surface of the transducer must be immersed in solid water at all times, if it is to operate properly.

The manufacturers of SONAR transducers usually provide very detailed instructions about mounting locations for their transducers.

It is common that a transom-mounted transducer will create some spray when the boat is being operated at high speeds. The amount of spray that is produced and the directions in which the spray is thrown will depend, of course, on the design of the transducer and the depth it is immersed into the water.

A continual stream of spray from a SONAR transducer onto the cowling of an outboard engine is annoying, and it could cause damage to the engine if the water can enter inside the cowling. In the event that the transducer location and mounting depth cannot be adjusted to a position that allows for both good SONAR operation and reasonable spray, one can always resort to installing a spray deflector on the transom to suppress upward spray from the transducer.

In the case of Lowrance sounders, they often are supplied with a rather small transducer called a Skimmer transducer. It is my experience that it is possible to get excellent SONAR performance from a Lowrance Skimmer transducer while not creating any spray that will be able to hit the cowling of the power head of an outboard engine.

jimh posted 07-01-2013 11:26 AM ET (US)     Profile for jimh  Send Email to jimh     

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