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What about this idea for a transom mounted transducer?

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What about this idea for a transom mounted transducer?

Old 03-24-2007, 03:09 AM
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Default What about this idea for a transom mounted transducer?

I want a 1kw tranducer for my aluminum boat which is being outfitted with Garmin electronics.
Problem is, there aren't any. The only models that have 1kw power AND are Garmin compatible are:
the M260 "In-Hull" - which can't shoot-thru my boat's 0.25" alloy plate,
or the B260 bronze "Thru-Hull" - which causes electrolysis issues.
Unless I want to pay for a hugh cutting and welding of a "box" into my new hull (which I don't).

So . . . . . . .
what if I bolted a third trim-tab to the transom of my boat, down near the keel,
and then mounted a B260 "thru" the trim-tab plate, as if it were a "hull".
I could then "trim" the transducer DOWN into the clean flow of water just beneath the keel,
maybe even fine-tune the transducer's angle during different boat speeds and boat bow rise conditions,
and then trim it UP, out of harms way, when trailering, etc.
I would cut away any excess trim-tab plate beyond the footprint of the transducers tear-drop shape, if necessary?

The wiring would be routed up thru the stem and up along the back of the transom.
The screws for mounting the trim-tab's hinge would go into the mounting plates already on the boat's transom,
which are normally used for attaching zincs and smaller 500w plastic transducers.
The mounting screws for the top of the trim-tab's actuator would be mounted near the top of the transom,
far above the water line.

Well, whadda ya think??? Is this a workable transducer mounting system, or am I just up typing too late???

Thanx, Dave.
Old 03-24-2007, 05:14 AM
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Default RE: What about this idea for a transom mounted transducer?

Shoot, I've never thought or heard of that, but why not? Sounds like you've given it a lot of thought.

I think it's a good idea, FWIW...
Old 03-24-2007, 03:51 PM
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Default Re: What about this idea for a transom mounted transducer?

Dave, Airmar makes a vertically adjustable transom bracket for the 260 series. Perhaps that would work.
Old 03-24-2007, 07:46 PM
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Default Re: What about this idea for a transom mounted transducer?

The extra cost of the stainless steel Airmar transducer may be less than what you are planning to build ;?

My boat is aluminum and I went with the stainless steel unit . . . in the end less cost and less work

GOOD LUCK with your project
Old 03-24-2007, 10:23 PM
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Default Re: What about this idea for a transom mounted transducer?

Thanx Guys!

You have good suggestions, but, I've been down those paths already, and reached dead-ends each time.
That's why I'm resorting to home-made contraptions for this project:

The adjustable transom mount for the M260 is no longer an option, because Airmar revamped the M260 about a year ago.
The new version is not compatible with the older transom bracket, and nobody seems to have any of the earlier M260's available.

The SS560 is a great transducer, and readily available for installation on aluminum plate boats.
But, it not Garmin compatible, and Garmin's new proprietary digital sonar ID cables & plugs are not "cut & spliceable".

Airmar is developing a wide angle SS270W (similar to the SS560), and dual SS164 tilted beam transducers,
which may be Garmin compatible (???). Availability is next Fiscal Quarter, next year, or maybe longer,
depending who you talk to.

Until then . . . . . . I tinker with alternative ideas . . . . . . this one is the best that I've come up with, so far.

Thanx, Dave.

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