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  What is the best style Transducer for a Montauk

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Author Topic:   What is the best style Transducer for a Montauk
PSW posted 05-27-2003 11:53 AM ET (US)   Profile for PSW   Send Email to PSW  
After raising the motor one hole on Friday so that my bottom cavitation plate is 1 1/3" inches up from the keel I noticed that my Lowrance 200khz transducer sprays way too much water. Before I could tolerate it, but now that I have the boat riding just perfect it sprays the water so I can't see my motor's pee hole working. That is pretty important to me as a gauge to make sure the motor is getting all the water it needs and everything is working fine.

Now my transducer is pretty large, which I like because it can read the bottom very well at speeds into the mid 30's. When I got the boat the old transducer was mounted on a custom cut peice of 2x6 that was bottom painted. It was secured nicely and was shaped to the boat nice so I left it and mounted the new transducer as low as I could on it. the 2x6 is flush with the boattom of the boat just to the right of the engine. It looks very nice and in concept you would think that by being back another 1 1/2" inches from the hull the water my be a little better for accurate reading.

My last Montauk had the transducer right on the hull and it sprayed also, but not this bad and I could atleast see the pee coming out the motor. I am thinking of making a custom peice that will have a little canopy over top to deflect the spray. What has worked for others?

Any thoughts would be appreciated.


PSW posted 05-29-2003 06:48 PM ET (US)     Profile for PSW  Send Email to PSW     
So am I the only guy in the forum that uses a transducer?
dgp posted 05-29-2003 07:28 PM ET (US)     Profile for dgp  Send Email to dgp     
I have a Lowrance 192kHz "skimmer" x-ducer on my Montauk. I have it adjusted that it just skims the surface of the water and does not produce a rooster-tail. Normal results adjusted this way.
Dick posted 05-29-2003 11:53 PM ET (US)     Profile for Dick  Send Email to Dick     
I have a Raytheon with speed and temp. It is mounted flush with the hull on the forward end and a slight down angle on the aft end. No spray and it works fine.


PSW posted 05-30-2003 11:06 AM ET (US)     Profile for PSW  Send Email to PSW     
Thanks guys for the input. Now with the transducer just skimming the top of the water like this are you able to get an accurate reading at 30 mph. I know I could raise it up a bit from the bottom of the hull and that would fix the problem but then it would not work as well.

thanks for the input,


doobee posted 05-30-2003 10:23 PM ET (US)     Profile for doobee  Send Email to doobee     
The bottom of the transducer should be 1/8" below the transom at the front and 1/4" below the the transom at the back. Moving the transducer aft should help, but only if the block it is mounted to is above the bottom of the transducer.

One other point, if your engine is not counter rotating, your transducer should be mounted to the left of the engine. This helps to counter the torque that causes the boat to list to port at high speed, and may improve the ride.

flawton posted 05-31-2003 10:06 AM ET (US)     Profile for flawton  Send Email to flawton     
I recently installed a lowrance x87 on my 81 newport and couldn't be happier. I basically followed the instructions in Jimh's reference article for transducer mounting.

I mounted it on the port side on a 1' thick plastic block that was well sealed with 3m 4200 caulk. I like the block mount becuase I can adsjust and change the transducer as much I want without disturbing my under the water line hull screws. Got lucky and havent had to adjust it so far and it works very well. There is a little spray but not a huge rooster tail (the anti cavitation plate on my yamaha 90 2s is approx 1.5 inches above keel). I get good depth readings at WOT which i would guess is 40 +/- mph (I have no GPS to confirm).

If your transducer is mounted on a block, move it around and play with it until you find the optimal location (best performance&least spray). Thats the beauty of the block installation. you might be suprised what a 1/4" will do.

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