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Mounting a DFF3D Transducer on an Armstrong Bracket?

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Mounting a DFF3D Transducer on an Armstrong Bracket?

Old 11-27-2017, 09:26 PM
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Default Mounting a DFF3D Transducer on an Armstrong Bracket?

I have a hull design that will make it tough to properly mount a transducer (and fairing block) for the new Furuno DFF3D Sonar

I could drill on the centerline as I have bilge access but as the boat is trailered, the fairing block definitely will not clear the frame of the trailer when launching and retrieving

The only other spot (besides a transom mount which will also be awkward due to large trim tabs being in the way) is to mount it on the bottom of my Armstrong bracket

What worries me is after the mounting, running the risk of water intrusion---not sure the collar and nut of the transducer would make a proper water-tight fit (???)

That bracket so far is water tight and provides lots of flotation for my Suzuki DF300---would like to keep it that way

Anybody ever have good results mounting a large transducer on an extended aluminum bracket?
Old 11-27-2017, 09:31 PM
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if you use the mounting procedure as on a standard hull..and use 4200 you should have a very good seal.

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Old 11-27-2017, 09:37 PM
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How many holes would have to be drilled and sealed? I know the transducer has its collar and nut but what about the fairing block----is it just held on by the transducer or does it have its own bolts that would also have to be drilled and sealed?
Old 11-27-2017, 10:31 PM
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Besides the stem you also have a bolt at the forward end of the fairing.
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Last edited by semperfifishing; 11-27-2017 at 10:49 PM.
Old 11-28-2017, 09:13 AM
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Thanks for that. Are there any pictures of DFF3D transducer hull installs? I've only seen one on-line that was a center of keel
Old 11-28-2017, 09:38 AM
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Not sure if it will help but here is a picture of ours. Port side on a Defiance 250ex. We had it installed because the fairing block had to be cut. We installed everything else.
The DFF-3D is working GREAT.
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Old 11-28-2017, 01:29 PM
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Not to say that I am surprised but my post from earlier has for some reason been deleted.


Due to the size of the transducer I would be concerned with causing turbulence over the face of the props. You also need to think about the dissimilar metals issue as bronze and aluminum are mortal enemy's
Old 11-28-2017, 04:26 PM
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Turbulent water over the prop of my DF300 caused by a big transducer and fairing block would be a deal breaker for me. I installed the Armstrong bracket specifically to improve the way the boat handled

I'm thinking my only other option would be a center of keel install then modify my trailer so the fairing block clears the trailer frame. Hey Jug Island---is that install on the Defiance that is manufactured out here on the West Coast? If it is, my boat has a similar hull design -- it looks like you were able to work around the trailer issues. My trailer is full of rollers which would have to be modified.
Old 11-28-2017, 05:04 PM
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She is a East Coast Defiance with a new DF300 and I believe it is an Armstrong bracket. She is a great boat and we run her 40 to 60 miles out but with the new DFF-3D we are looking closer in. You can scan a lot of bottom with the 3D.


If you have a similar hull get rid of those rollers and you will have no problems with the thru hull transducer for the DFF-3D. We have a good picture running in the 20 knot range.
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Old 11-28-2017, 07:50 PM
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Wow, nice looking ride! I like the shelter deck, too--- wish I had that mod on my boat

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