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Old 11-29-2010, 10:06 AM   #1
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Default hanging trim tab

pull my boat out of the water for the winter, and had one trim tab hanging off from the hinge, and the other one working its way out of the hing 1/2 of the way already.

Both were not damaged or bend, and the pistons work.

Any ideas why they are working their way off the hinges?

The hing is basically a crimped joint, so I would think it's suppost to pop out, if there is a problem and not rip a hole in the boat.

I just got this used boat, and suspect someone was playing with the trim buttons to much and wiggled them out, or just extended them to much and popped them out.

I'd post a photo, but don't know how to do it on here.
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Old 11-29-2010, 01:03 PM   #2
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send me the photo at steve.stephens1@frontier.com

I'll post it for you...you can select the little picture frame above..when you put your cursor over it..it says insert image....
you picture must be saved in some sort of sight...a free picture posting site or put it in an album here...

SP
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Old 11-30-2010, 05:32 PM   #3
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i spoket to Bennett, they said the end of the hinge attached to the boat should be crimped to prevent travel, but the tabs are 10 old, so it might be wore.

replacement is $29 bucks.

I think i'm going to install the LED tab indictor switch at the same time to make it easer to how were they are.
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Old 11-30-2010, 05:38 PM   #4
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sounds great.....I would replace them and maybe add the auto trim tabs too....I sure love mine....works quite well....

SP
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Old 12-01-2010, 01:22 PM   #5
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I don't think you can just add the LED tab indicator switch (EIC) without also swapping out the hydraulic rams.

The rams used with the EIC have sensor wires added to them so they can provide feedback to the EIC for tab position.
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Old 12-09-2010, 01:28 AM   #6
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sorry I'm so late about this..but I've been trying to figure out where to host it....finally I went over to my album in the boc...

SP
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Old 12-09-2010, 08:31 AM   #7
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hai pascavone

as far as i can see and think.....look at the top of het pistons where the are connected to the plate that's mounted on de boat, to me i think that is cracked or bended at the top of the cilinders on both sides (right side more then the left so that is why the right one totally got out of his rail) if you are going with full speed and using the tabs all the way down tot keep the boat in line for a long time or time after time, the smaller parts of the cilinders can't stand the power of the water..mostley it takes yust a few clicks with the tabs to keep your boat in line ore straight to the water, when i was going with a lot off people on the lake with
my 28 bayliner i had some years ago, i sometimes asked them to take another place in the boat so that it was not neccaserry to use the tabs all the way down....so inspect the hinge parts of the pistons/cilinder at the top were the go into the plate installed on the boat i quess the plastic is tortuonaled/bent and cracked

greatz ed

lets wait on some more reactions.......it's just my idee as far as i can see on the first picture because the cilinder/piston is not standing straight in line with the plate mounted on the boat

succes with it
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Old 12-09-2010, 01:42 PM   #8
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WOW!!! I doubt that this is the result of someone 'playing' with the tab buttons. I play with mine almost constantly while underway. This looks like a part(s) failure or some unknown external force at play here (PO hit something......maybe?) I doubt we'll ever know the true root cause. Regardless of cause this will obviously not due and needs to be fixed.

I have to agree with Ed, I don't believe the attachment point of the ram on the transom as well as on the tab itself is not designed for lateral movement like that. It looks like the attachment point at the top of the ram is twisted. I wouldn't be surprised if it's tweaked on the tab as well. You could probably bend the metal back to be close to inline. I'd also be concerned with stress cracking and be worried about further failure in the future. A mechanical engineer could probably shed more light on this. I'm just a Computer Systems/Network Engineer, and not a 'real' engineer.....LOL (If only we had a knowledgeable mechanical engineer on this site...........................)

BTW-Bennett said it was $29 for the tabs or just the hinges?
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Old 12-09-2010, 02:08 PM   #9
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Those are ugly photos.

The trim tabs certainly appear to be Bennetts - their "drop fin" design, which are typically used on applications where a larger flat tab is needed but there is not enough room for them.

The back edge of the tab is bent to an obtuse angle, which then slides into the slot created by the mounting and backing plates fastened to the transom. The tab is retained in the slot by short bent tabs on the mounting plate - left and right sides.

Here's my take. If you look at the transom you will see that it is not "flat". Meaning, with the hull sitting level, if you were to hang a plumb line from a point on the transom above the out drive you will notice that the line does not come close to touching the the transom at the drain plug. What this means is when the tab is mounted it is physically angled inward (think "toe in" from the automotive world).

Now, with regular flat tabs this isn't an issue. But with the drop fin tabs it is an issue. The water coming off the bottom of the hull below the tab mounting plate is flowing parallel to the hull. But the drop fins of the tab are not parallel to the hull so the water hits the side of each fin. The tab's fins are effectively re-directing the water flow inward towards the centerline of the hull and as a result I would suspect a great deal of lateral stress is created on the trim tab assembly. Indeed, The port tab appears to have been pushed outward to port, and the starboard side looks like it went starboard.

You need to replace those drop fin tabs with regular flat tabs.

Dan
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Old 12-09-2010, 09:43 PM   #10
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ppppffffttttt.. shrew i'm already happy that everybody (i hope) understands what i try to explain......

and an what you said about the flat tabs.......i had the same on my bayliner and i didn't had that problem the bended part makes the tab stronger, maybe it's an idee to get the most of the bended side part of to try if it works, buying new tabs is always an option if it does'nt work my opinion is still the former owner or himself has used the tabs to much and to fast (not in little steps but in one move from up to all the way down, you have to do it in little steps, i always did that) when he was already on top speed, the power that comes free......i think the tabs and pistons cant handel that.

greatz, ed
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