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Author Topic:   Transducers
Corky14 posted 08-09-2009 12:22 PM ET (US)   Profile for Corky14   Send Email to Corky14  
I have a 285 Conqust and there are two transducers mounted on the transom, one for the electronics and the other for the Verado Smartcraft system. When the boat is running at slow speeds both transducers provide speed, air and water temp information just fine, however when running on plane all information is lost. The transducers are mounted just inside the trim tabs on the port and starboard. It's driving me crazy!! Any suggestions?
jimh posted 08-09-2009 01:30 PM ET (US)     Profile for jimh  Send Email to jimh     
For a SONAR transducer to work properly there must be good coupling to the water. A layer of aerated water will cause attenuation of the signal. Any air gap will also cause attenuation. Based on your narrative the most reasonable assessment of your transducer location is they're mounted too high out of the water.
TransAm posted 08-09-2009 02:11 PM ET (US)     Profile for TransAm  Send Email to TransAm     
I have never had good luck with transom mount tansducers and their ability to return information at planing speeds. I have shifted mounting positions, used wedges designed to assist in high speed operation, and still have problems with any speed over say 15 MPH or so. I looked into a thru-hull transducer, but the transducer unit that seemed the best fit for my boat was $600. Had it not been for the cost, I would have gone that route. I should note that the transom mount transducer is mounted to my Whaler Drive which may be operating in slightly aerated water contributing to my higher speed performance problems.

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