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Author Topic:   Transducer location on 17' Montuak
JT Dimmick posted 05-06-2000 10:43 AM ET (US)   Profile for JT Dimmick   Send Email to JT Dimmick  
I recently installed a Raytheon 470 fishfinder on my Montauk. The transducer is located about 18" from centerline as the manufacture suggested. I lose bottom and speed at about 12 to 15 mph. The old unit, an Eagle fishfinder held bottom into the high 20 mph. It was mounted closer to centerline, (too close according to the installer). Any suggestion to improve performance would be greatly appreciated.
dgp posted 05-06-2000 11:11 PM ET (US)     Profile for dgp  Send Email to dgp     
JT, I installed an Apelco / Raytheon transom mount x-ducer on my Whaler 2 years ago following the mfrs directions exactly and it performed normally all the way up to 40 mph.
Check the protrusion depth below the hull and make sure it's set to the proper angle. Also make sure it's away from any hull strakes. Don
triblet posted 05-07-2000 02:29 PM ET (US)     Profile for triblet  Send Email to triblet     
18" from center line will be out of the
water as soon as you are planing. On my
Montauk, I originally mounted the
transducer on the port side, 8" from center
line. After some idiot (guess who)
kicked it while trying to get up whaler's
dumb one step ladder, I moved it to the
starboard side. When I recently replaced
the Humminbird Wide Optic with a Humminbird
3D Paramount, and having replaced the one
step ladder with a three step, I moved
it back to the port side.

The 8" number was taken from a buddy's
Montauk with a tranducer installed by a
long time whaler dealer.

First off, you need to move the transducer,
then play with its height and angle
adjustments. If it throws a big rooster
tail, its probably too deep or too angled.
The wide optic would maintain contact with
the bottom to about 30 knots. The
3D has a bigger transducer and I lose
contact on the startboard (motor side)
beams at about 25 knots.

Chuck Tribolet

Walt Steffens posted 05-08-2000 05:40 PM ET (US)     Profile for Walt Steffens  Send Email to Walt Steffens     
JTD: In this I have some experience. I have owned 3 hulls of three sizes. I didn't follow the factory advice on any of them. I mounted the transducer dead nuts in the center of the transom, in the case of my 17 just ahead of the engine and on the 21 & 25 between the engines. I have encountered no problems and have been able to track or hold signal at speeds up thru 50 mph +. The units I used were all Hummingbird ranging from a flasher unit on the 17 to wide displays and 3d's on the 25. I mounted the transducer so as its leading edge was flush with the bottom of the boat at its deepest point using a straight edge as a gage. I have found that the water here is as clean or cleaner than any where on the hull. The only thing I had to be really careful of was that on the 17' single engine installation was that the tilt & trim was set so as not to let the leading edge of the lower unit strike the aft end of the transducer when the engine was tucked in all the way. I can't think of any reason that other manufacturers transom mount transducers wouldln't work equally well in this position. Hope this helps you out! WLS

jimh posted 05-14-2000 12:42 AM ET (US)     Profile for jimh  Send Email to jimh     
You might be interested to see how I mounted the transducer on my Whaler 15 Sport. The hull shape is pretty similar to the Whaler 17.

There is a closeup of the transducer mounting in the article at:


JT Dimmick posted 05-22-2000 09:52 AM ET (US)     Profile for JT Dimmick  Send Email to JT Dimmick     
Thank you to everyone who replied!!! I moved the transducer to about 8 inches from centerline, everything is working perfectly. It holds bottom to over 40 mph and is very stable. Thanks. . . John

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