Transducer mounting on transom?

bcsukas

bcsukas

Cadet
Joined
Apr 25, 2011
Messages
14
Recently installed the 597ci HD DI to my trolling motor, I also purchased an additional transducer and quick connect base so I could use the unit from the steering console while under outboard power. Not concerned with get readings while running at 30-40mph, wanting to get good readings while idling or slightly faster. My question is where to mount the transducer on the transom. I've attached two photos: one is of the lower portion of the hull with the three holes representing the two live well drains(outside) as well as the drain plug(this part is recessed approx 11" from back of transom and 6" in depth), the second is of the far back edge of the transom located starboard side. The hull is actual bottom of the hull is stepped back? What I was wanting to know is could I mount the transducer between the drain plug and the live well drain on the starboard side? My local mechanic told me that at idle or slow speed I should trim the motor up because the exhaust ports on this motor/boat combo sit lower in the water compared to today. I was wondering if the prop being that close would cause any problems obtaining clean readings? With motor fully trimmed down the prop is still 2' from transducer. Or should I mount the transducer on the far back edge of the transom, problem being I'm not sure where water line is while under idle or slightly faster speed? Obviously want to limit the amount of holes I put in the hull so needing any and all help.
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Silvertip

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: Transducer mounting on transom?

You mount transom transducers like the instructions tell you. Those instructions usually include the following:

1) Starboard side
2) As far from the prop as possible
3) Not in line with any strakes, rivet lines, or other protrusions that interrupts water flow.

In-line with the prop is probably the worst place to mount it.
 
pdgs

pdgs

Petty Officer 3rd Class
Joined
Sep 22, 2012
Messages
77
Re: Transducer mounting on transom?

Lowrance has a pretty good website with instructions.

The basic guidline for a 20deg skimmer transducer is to mount it at least 16" to starboard of the engine. A couple of inches either way is not going to make a lot of difference but if you get too close you'll start to ping on the prop. Lay a straight edge up on the bottom of the hull and set the bottom of the transducer so that it is even with the top of the straight edge. Mark and drill you holes center of the adjusting slots on the mount and then mount it. You will have enough vertical movement to adjust for either not enough contact when on plane or too much. Not enough will result in loss of depth finding and too much will result in excessive spray.
 
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