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Old 04-19-2011, 06:14 PM
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Default Where to put trim tabs??

Are the trim tab supposed to be in the middle? It is a inboard boat. I would think that they should be spaced apart more.
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Old 04-19-2011, 06:18 PM
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I've never seen tabs that close together. They should be as close to the outer edge as possible. I doubt they would be very effective the way they are.
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Old 04-19-2011, 06:34 PM
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That is just wrong!

They should be mounted outboard, 3 to 4 inches from the chine usually right where the chine flat ends. Mounting then outboard gives the best combination of side to side and fore to aft trim correction.

If this is your boat get in touch with me so I can help you move them to the proper position.

Tom McGow
Bennett Marine
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Old 04-19-2011, 07:22 PM
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a

Last edited by rhagy1; 04-19-2011 at 07:29 PM. Reason: duplicate
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Old 04-19-2011, 08:27 PM
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Quote:
Originally Posted by Tabman View Post
That is just wrong!

They should be mounted outboard, 3 to 4 inches from the chine usually right where the chine flat ends. Mounting then outboard gives the best combination of side to side and fore to aft trim correction.

If this is your boat get in touch with me so I can help you move them to the proper position.

Tom McGow
Bennett Marine

OP, your in good hands with the Tabman. You won't find better customer service. The reason I would only consider Bennett if I were purchasing tabs.
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Old 04-20-2011, 12:47 PM
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Looks like a Shamrock boat?
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Old 04-20-2011, 12:52 PM
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Tabman knows his stuff! 4" from chine
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Old 04-20-2011, 02:02 PM
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Quote:
Originally Posted by Tabman View Post
That is just wrong!

They should be mounted outboard, 3 to 4 inches from the chine usually right where the chine flat ends. Mounting then outboard gives the best combination of side to side and fore to aft trim correction.

If this is your boat get in touch with me so I can help you move them to the proper position.

Tom McGow
Bennett Marine
Tabman, glad you chimed in. While you're here:

A:Isn't it true that the configuration of some hulls/chines makes it tougher to have the tabs at an optimum position? (I've often wondered this, glad this came up)

B: don't some inboard ski boats get good performance out of the single wake plates mounted in the middle, which is basically one wide trim tab?
THANKS
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Old 04-20-2011, 02:19 PM
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I'm not tabman, but to answer a couple of things.

Tige uses a single wide tab on their ski boats to change the wake characteristics. It allows a flatter wake for slalom and bigger wake for wakeboarding. However, the Tige boat has essentially a 0 degree deadrise. This boat obviously has much more deadrise.

I previously owned a Stingray I/O which I installed lencos on. The stingrays have a protrusion under the molded in swim platform at the outer edges of the platform. Bottom line is it's very difficult to mount the tabs where you would prefer. It's possible, but you end up mounting to a curved surface. Anyway, I mounted mine further inboard than I would have liked. They ended up behaving fine. Sometimes it took more tab and maybe reacted a little slower, but the boat rode much, much better than with no tabs at all.

In this case, it appears they should have been mounted further out.
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Old 04-20-2011, 02:37 PM
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C. Edmund,

You are correct, on some boats it is darned hard to get the Trim Tabs all the way outboard where they should be. But they really should be as far out as they can. If the Trim Tabs are too close to the centerline, like the boat in the photo, when you try to correct for a list you will also get bow down input from the lift being so close to center. Having them outboard "uncouples" the side to side component from the fore to aft component of their functions.

When an installer comes across a transom that is challenging, they should contact their Trim Tab manufacturer (or me ) to see what options might make it possible to install them in the best possible position.

Chris196 is exactly correct regarding why the ski boat manufactures us one Trim Tab. Notice that they call it a wake plate not a Trim Tab. There are some watersport boats that are actually using three Trim Tabs, one in the middle and two conventionally mounted ones to give maximum control of wake and attitude.

Tom
Bennett Marine
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Old 04-20-2011, 07:01 PM
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I called Dusky and that is where they put them. They put them there because it is a straight inboard.
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Old 04-20-2011, 07:35 PM
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Quote:
Originally Posted by rhagy1 View Post
I called Dusky and that is where they put them. They put them there because it is a straight inboard.
That makes zero sense. Did whover told you that say why they thought that made any sense on a single inboard?

I have seen a lot of straight inboards, most with tabs, and never seen any mounted thet way. There is NO good reason to do that on any inboard except perhaps a ski/wakeboard boat. There is a huge reason not to mount them that way, performance.
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