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what are these tabs

Old 08-25-2017, 01:10 PM
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Good afternoon;


I recently purchased a 16ft Mirrocraft V-hull aluminum fishing boat that has a 1989 Evinrude Tracker Pro series 70hp outboard. I am preparing to put a Hummingbird helix GPS/fishfinder on the boat but I have a slight dilemma.


There are two tabs on the bottom of the transom which prevent installation of the transducer.


Does anyone know what these are for?
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Old 08-25-2017, 01:14 PM
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Static trim tabs, give the back end a little more lift and an even ride, would be my best guess. Maybe somebody hung a heavier motor on it at some point and needed that little bit of lift.

I'm not an expert, but there is a Marine Architect here on THT you can ask. Be careful, he's been pretty cranky about us recently.
Old 08-25-2017, 01:19 PM
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Originally Posted by Dulcecita Lures View Post
Static trim tabs, give the back end a little more lift and an even ride, would be my best guess. Maybe somebody hung a heavier motor on it at some point and needed that little bit of lift.

I'm not an expert, but there is a Marine Architect here on THT you can ask. Be careful, he's been pretty cranky about us recently.
^ This, I have the same thing on my 17' Monark that porpoises like a MOFO with out them.
Old 08-25-2017, 01:29 PM
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Looks like an old transducer mount is already there. Can you adapt that?

or mount the new transducer on the tab.
Old 08-25-2017, 02:19 PM
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Dulcecita Lures, MonarkBoats and Bob,s Cay, thanks for responses, I thought they might be trim tabs but they seemed to be small for tha, they extend out 2 inches, but that makes sense. There may have been a heavier motor on it at some time, not sure. That is extremely good to know about the 17' Monark porpoising without them. That answers the "do I want to remove" them question that was rolling around in my head.


Bob's Cay, no I can't use the existing mount it is the wrong style and too close to the motor. I have been thinking about cutting a transducer plate in half to double the thickness and then just mount it on the plate. at this point mounting on the plate seems like the only option.
Old 08-25-2017, 03:10 PM
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Through hull transducer?
Old 08-26-2017, 05:28 AM
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Originally Posted by phillipgo View Post
Through hull transducer?


Thanks for the post, I had given that some thought but prefer not to go that route
Old 08-26-2017, 05:54 AM
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could you bolt a piece of aluminum angle on to the static tab, just wide enough to mount your transducer? or would that cause turbulence? Just wondering out loud.
Old 08-26-2017, 06:07 AM
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If the t/d mount can be adjusted to mount to the tab, just through-bolt on the tab. If not, hHow about a block that would put the t/d past the tab? I'd use Starboard and through-bolts.
Old 08-26-2017, 11:52 AM
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Boataholic and OReely, thanks for your posts. This is pretty much where my thoughts are at too. I ordered a 3/4" thick transducer plate which I will cut in half and put the two halves together then mount the bracket and tranducer to this. Transducer should extend slightly past the static tab. This should not affect the performance of the static tabs and not create any excess turbulence. (All in theory of course)
Old 08-26-2017, 01:12 PM
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I don't think you can mount a t-dueser to shoot through an aluminum boat, no?

Last edited by horsepen40; 08-26-2017 at 01:15 PM. Reason: Spelling error
Old 08-27-2017, 06:37 AM
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Originally Posted by horsepen40 View Post
I don't think you can mount a t-dueser to shoot through an aluminum boat, no?
This will answer

http://vexilar.com/

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