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Trim Tab comes apart while underway

Old 10-13-2020, 06:48 PM
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Default Trim Tab comes apart while underway

While coming back in from Offshore today my trim Tab came apart. We had just finished running the following seas at the mouth of the jetties. I was throttling back up to a plane when the boat violently rolled and veered to to starboard. I immediately slowed down and we proceeded slowly to the ramp. Once on the trailer I was able to see what happened. It looks as though rusted welds and metal fatigue caused the port Tab to separate from its backing bracket, water got between the and finally it completely failed and folded backwards. Now,...to buy a new pair of tabs or try to have it straightened and re-welded.




Old 10-13-2020, 08:35 PM
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If they are Bennett just replace them, welding and fabrication will run 75-125/hr and if one is going the other will soon follow. Now if you are handy and have access to a tig welder that's always a option , don't forget time is money yours or someone else
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Old 10-13-2020, 09:05 PM
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Unfortunately, I’ll second the “buy a new pair” approach. It took me a while to learn that my time is worth more than I thought and having something new helps keep peace of mind. Best of luck!
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Old 10-14-2020, 12:04 AM
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What mfgr? Folded up like that it's hard to see just what happened .
This may not have contributed to the breakage but tabs generally require sacrificial anodes to help protect against corrosion that breaks them, especially in SW . Anodes on yours?

Did the hinge pin fall out or break?
Old 10-14-2020, 03:10 AM
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That looks like a Bennet tab that someone’s laminate welded a larger tab to and their welds have rusted and failed.
Old 10-14-2020, 05:10 AM
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Originally Posted by The Woo View Post
That looks like a Bennet tab that someone’s laminate welded a larger tab to and their welds have rusted and failed.
I agree, it looks like some sort of home engineering project that failed, but it's hard to tell from the pictures.
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Old 10-14-2020, 07:28 AM
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Yes, it is a Bennett. Measurements on the big plate are 12" x 16" and the smaller plate on top are 8" x 12 ". Great observation that the units may have been modified. It's rather telling in that they hinges do not go all the way from side to side. I guess the previous owner had access to some stainless welding capability as the boat came with a really heavy duty welded stainless kicker bracket on the swim platform back braced to the transom. Also, I may have found the source of some vibrations that I have been hunting down. I was suspecting lower unit issues when in fact I may have had water getting between the top and bottom planer plates. Here is a picture of the starboard planer which is still in one piece. So the next question is what do I want to replace them with? An 8" x 12" planer does sound a little on the small side for a 27' boat.


Old 10-14-2020, 07:41 AM
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I would look at replacing the whole assemblies, but Bennett has their sizes listed https://bennetttrimtabs.com/product/...lane-only-tpo/
Old 10-14-2020, 08:05 AM
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Not sure if you are using anodes on your trim tabs but if not, that might be the issue.
Old 10-14-2020, 08:11 AM
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Someone definitely modified you tabs. Whether you still need that much tabs you'll have to determine.
Old 10-14-2020, 08:13 AM
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It looks like I could go with the TPA1812 Trim Plane Assembly. In other words stick with an 18" x 12" unit. I just need to figure out if my existing hydraulic cylinders will fit and function with these. If so it will be a relatively easy swap. I also agree on changing out both sides. I am thankful that the planer did not fail while I was running the pass. The seas at the mouth of the jetties require you to be on your toes as it is. I'm guessing that who ever modified the planers did so without removing them from the boat. They are only welded on the 2 sides and the back. Not on the leading edges which is probably what pecipitated the failure. No telling what kind of stresses were on that leading edge.

https://www.amazon.com/Bennett-Marine-Inc-TPA1812-Assembly/dp/B004P11B6W/ref=sr_1_23?dchild=1&keywords=bennett+trim+tab&qid=1602680835&sr=8-23 https://www.amazon.com/Bennett-Marine-Inc-TPA1812-Assembly/dp/B004P11B6W/ref=sr_1_23?dchild=1&keywords=bennett+trim+tab&qid=1602680835&sr=8-23
Old 10-14-2020, 08:25 AM
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How old are the tabs?

Were they modified?

Anodes?
Old 10-14-2020, 08:53 AM
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Originally Posted by mystery View Post
How old are the tabs?

Were they modified?

Anodes?
I am assuming they are original at 23 years old. No idea of when they may have been modified as I am not the original owner. and no anodes were present. I bought the boat in June and it it has been been a project since then with a tremendous amount of work performed. It looks like the tabs are yet another item to add to the list.
Old 10-14-2020, 08:58 AM
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It looks like they were mounted just a touch too low too. That could have been complicated by someone adding that second layer though. There really shouldn't be much stress on the leading edge.

Seems like the leading edge was catching water, which had to be a drag on the boat even prior to the damage.
Old 10-14-2020, 09:07 AM
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Originally Posted by km1125 View Post
ISeems like the leading edge was catching water, which had to be a drag on the boat even prior to the damage.
This might have been the source of a vibration that I was trying to figure out. I was suspecting something from the lower unit. Even went to Harbur Freight and got a dial indicator to check the prop shaft. It could have been a weld fracture allowing water to catch on the leading edge. It probably went away when I used the planers to push the bow down. In other words the water pressure at higher speeds pressed it in place. I retracted the tabs to run the pass and get the bow up just prior to failure.
Old 10-14-2020, 09:08 AM
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I see everyone saying tabs need always need anodes. Is this true for trailer boats that live out of the water when not in use? If they should always have anodes, you would think Bennet would have them built in.
Old 10-14-2020, 09:31 AM
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Originally Posted by VTXrider View Post
I see everyone saying tabs need always need anodes. Is this true for trailer boats that live out of the water when not in use? If they should always have anodes, you would think Bennet would have them built in.
Yes, you have a point. Anodes for stainless steel that spend mot of their life on a trailer does seem kind of pointless.

On another note.....Still riding a VTX? That was my old ride. I moved up to a Goldwing a couple years ago.
Old 10-14-2020, 10:02 AM
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Originally Posted by Cable Mariner View Post
Yes, you have a point. Anodes for stainless steel that spend mot of their life on a trailer does seem kind of pointless.

On another note.....Still riding a VTX? That was my old ride. I moved up to a Goldwing a couple years ago.

Seems I will be making that trade soon. My parents are talking to ma about taking over my dad's Wing and giving my VTX to my niece. Honestly, I think that will be a great move for me to ride more since I have decided that I absolutely hate riding around town in Miami and any long distance in the VTX wears me out.
Old 10-14-2020, 10:24 AM
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Same thing happened to me on a Lenco tab recently. Ripped the actuator in half and the tab and half actuator are somewhere in the gulf. I was able to contact Lenco and just order one tab for replacement. I did first contact a welder who said that it was risky to weld as it could melt the transom. My separation was only 2" from where the tab attached. At any rate, sent it out to the repair shop as stripping screws and 5200 was more mess than I had time for. $400 plus parts later, and its good as new.
Old 10-14-2020, 11:33 AM
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Another local THT member came to the rescue this morning with a complete set of Tabs and Hardware taken off of his project boat. It looks like they should work. Hopefully, the screw holes line up, and I don't need to make may new holes in the transom.

This site is great!

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