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Permatrim and Trim Tab

Old 08-12-2020, 10:11 PM
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Default Permatrim and Trim Tab

If the outboard trim tab is in the correct position, then a Permatrim is added, what then becomes of the trim tab? Should it remain in the same position, centered or removed?

I know each and every situation may be different, so generally speaking....
Old 08-12-2020, 10:44 PM
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Trim tabs won't lift the bow. The permatrim will.

Trim tabs will lower the bow. The permatrim will too.

The trim tabs will level the boat side to side with more weight on one side. The permatrim's will not do this, unless you have twins.

Usually you want forces that can work together to work together do the same thing.

But use the PT to lift the bow after you raise the tabs when tabs up aren't enough bow up
And use the TT's to level side to side if you have a single engine.



Last edited by Bullshipper; 08-12-2020 at 11:58 PM.
Old 08-12-2020, 10:48 PM
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Not the trim tabs.... The outboard trim tab. The one directly above the prop.

I do appreciate the time you took to address this.

Last edited by ReelTime3979; 08-12-2020 at 10:58 PM.
Old 08-13-2020, 04:37 AM
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What type of boat do you have. Depending on the application, a Permatrim might be out of the water while on plane. It was, on my skiff. After boat was on plane, it was almost useless. It might have aided in keeping the prop wet.
Old 08-13-2020, 07:42 AM
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24 foot deep v center console with a single 250. Permatrim settled the few handling issues I was experiencing. And it's skimming on the water at cruise speed and faster. Just wondering with the added vertical surfaces of the Permatrim, what's best for the outboard trim tab and what others have done.
Old 08-13-2020, 07:58 AM
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The trim tab anode can still be used to help counter any adverse turning effect. Determine your typical cruise speed and engine trim angle. If the motor is more difficult to turn in one direction than the other, and if that is objectionable to you, adjust the trim tab anode so that the steering force is equal. Or as close to it as is possible.
Old 08-13-2020, 02:56 PM
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I am a little confused.

The motor has whats called a cavitation plate above the prop.It is not called a trim tab to be clear.
The larger permatrim plate can be mounted on the top or bottom side of the cavitation plate, depending on prop diameter and clearance between the prop tip and the bottom of the permatrim plate.
The permatrim has side angles that should turn down, to capture and direct more of the water the prop is spraying. Those bends also keep the Permatrim plate from bending under torque.

The Motor has a vertical anode fin under its cavitation plate that can be adjusted like a rudder as Alloyboy stated.It is not called a trim tab to be clear.

The Permatrim plate will not affect the angle of Anode Fin Rudder angle. Its angle not be changed unless the motor or hull will not go straight, hands free off the steering wheel.

It appears now that you do not have twins, or additional trim tabs. Sorry to be so wordy, just want to be clear.
Old 08-13-2020, 03:33 PM
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Would be nice if we had a common understand of words and terms.

Ain't gonna happen.

Do we need a THT glossary. Would people read it? Agree with it? Doubt it.
Old 08-13-2020, 03:36 PM
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Originally Posted by alloyboy View Post
Would be nice if we had a common understand of words and terms.

Ain't gonna happen.

Do we need a THT glossary. Would people read it? Agree with it? Doubt it.
A regional glossary. Did you know that the technical term for a lower unit is foot?
Old 08-13-2020, 03:38 PM
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I'm not confused. The cavitation plate is actually called an anti-ventilation plate. And the anode directly below that is the steering trim tab. To counteract or minimize the propeller torque "pull" felt through the steering system.

I have Lenco trim tabs and I'm not confusing them with the trim tab mounted to the antiventilation plate.

Just wondering if anybody has made any kind of adjustment to the trim tab after installing a permatrim. Is it even needed? Does it need to be in the center parallel to the downward edges or vertical edges of the permatrim? Or should it remain the way it was before the permatrim install?

And to be clear, the trim tab was mounted properly prior to the permatrim.
Old 08-13-2020, 03:44 PM
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Andy at simyamaha.com is the US distributor for Permatrim. He might know if any adjustment to the motor's outboard trim tab anode steering fin might be needed.
Old 08-13-2020, 03:45 PM
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Thank you. He's on my list of things to do. Just thought I would throw that question out here first. Thanks again.
Old 08-13-2020, 03:49 PM
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I installed Permatrims on two different boats. Never needed any adjustment
Old 08-13-2020, 03:50 PM
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Thank you!
Old 08-13-2020, 04:22 PM
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Originally Posted by ReelTime3979 View Post
If the outboard trim tab is in the correct position, then a Permatrim is added, what then becomes of the trim tab? Should it remain in the same position, centered or removed?

I know each and every situation may be different, so generally speaking....
Yes leave it alone as is
Old 08-13-2020, 04:32 PM
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Originally Posted by vandlor View Post
I installed Permatrims on two different boats. Never needed any adjustment
Are you saying that you left the trim tab/torque tab/fin tab/anode in a configuration that was previously set to help equalize steering effort and it worked exactly the same, pre and post Permatrim installation?
Old 08-13-2020, 04:36 PM
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Originally Posted by alloyboy View Post
Are you saying that you left the trim tab/torque tab/fin tab/anode in a configuration that was previously set to help equalize steering effort and it worked exactly the same, pre and post Permatrim installation?
You are funny. Yes, never touched it.
Old 08-13-2020, 04:38 PM
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Dupe.
Old 08-13-2020, 05:07 PM
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I actually think yamaha just discontinued
“finned” trim anodes, now they are all just
rounded with little vent.
(at least for the 300)
so no more picking a random angle for the dumb things!!
Old 08-13-2020, 05:08 PM
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I have put Permatrims on 5 boats--no change in the Anode fin adjustment needed. The Permatrim should run just on the surface of the water. IF it is out of the water, the motor is mounted too high, and I would expect other issues to be present.

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