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Transducer mounting advice needed....

Old 04-26-2008, 08:55 AM
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Default Transducer mounting advice needed....

Hello,

When installing a new transom-mounted puck-type transducer, which of the following issues take priority:

1) Mounting the transducer on the right side of the 125HP outboard to avoid the up-sweeping turbulence from the rotation of the propeller. I'm not sure just how much this is an issue as the hull is 3-6" in front of the engine.

2) Mounting the transducer on the left side of the outboard to avoid any possible turbulence caused by the livewell intake port, which is approximately 6" up from the bottom of the hull on the right side of the engine. The transducer could be mounted below the intake by 3-4 inches.

The reason I ask this is because the various manuals/installation documents seem to contradict each other in their preference for clean, non-aerated, non-turbulent water. In either case I do have the space to install a removable plastic mounting board so I won't have to be drilling more than a couple holes in the fiberglass hull....

Any constructive comments welcomed.

packrat
Old 04-29-2008, 10:37 AM
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Default Re: Transducer mounting advice needed....

Transom mount transducers don't work very well at anything above trolling speeds anyway. You said the livewell intake port is 6" up from the bottom and the transducer "could" be mounted below the intake by 3-4 inches. Keep in mind that the face of the transducer must be below the bottom of the hull. You can't mount it "up the transom" or the turbulents will kill it. Ideally, the transducer face should protrude about 1/4" below the bottom.
Old 05-02-2008, 08:49 PM
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Default Re: Transducer mounting advice needed....

Thanks for the reply,

The more I read up on the subject the more I learn. In my first post, I ask about the turbulence/pressure waves from the rotation of the prop. Now, I don't think this will be much of an issue as it really only applies to thru-hull transducers and inboard-powered boats. On the other topic, ie, livewell intake, I do understand how and where the transducer needs to be mounted on the transom's vertical, I just wanted to see if anyone knew of any reason not to put it below the intake (which is 6" UP from bottom of hull). I would be mounting the transducer's mid point at, or slightly below, the bottom of the hull....

packrat
Old 05-05-2008, 03:19 AM
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Default Re: Transducer mounting advice needed....

seaclutter - 4/29/2008 1:37 PM

Transom mount transducers don't work very well at anything above trolling speeds anyway. You said the livewell intake port is 6" up from the bottom and the transducer "could" be mounted below the intake by 3-4 inches. Keep in mind that the face of the transducer must be below the bottom of the hull. You can't mount it "up the transom" or the turbulents will kill it. Ideally, the transducer face should protrude about 1/4" below the bottom.


I have a P66 Transom mounted transducer. It performs excellent at all speeds.

Old 05-07-2008, 11:24 AM
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Default Re: Transducer mounting advice needed....

Packrat
Transducers need to be in "clean" water to work properly. I would not mount it behind the livewell intake or any other turbulence producer. Do a good study of your transom and find an area that is relatively "flat" ( parallel to the water line), has no turbulence makers in front of it (this includes lifting stakes or any other hull features), and is NOT on the lifting pad (if your boat has one). As mentioned earlier, the transducer should protrude below the water line WHILE UP ON PLANE at least 1/8". Mounted as described, your sonar should deliver good performance up to about 40 MPH. My experience has been that the signal starts to get to cluttered at high speeds to be much of a fish finder.
Hope this helps, Scott

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