Trim tab mounting angle
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Trim tab mounting angle

  1. #1
    Some guys never learn. bocco's Avatar
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    Default Trim tab mounting angle

    Didn't see any other place to post this so I'll ask here. I've been looking at lots of pictures of used boats with trim tabs. It looks like some are mounted such that the bottom of the plates are horizontal and some are mounted at at the same angle as the V in the bottom of the boat.

    So I'm curious what the reasoning is behind the 2 different mounting methods?

    Thanks

    Gary

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  3. #2
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    Quote Originally Posted by bocco View Post
    Didn't see any other place to post this so I'll ask here. I've been looking at lots of pictures of used boats with trim tabs. It looks like some are mounted such that the bottom of the plates are horizontal and some are mounted at at the same angle as the V in the bottom of the boat.

    So I'm curious what the reasoning is behind the 2 different mounting methods?

    Thanks

    Gary
    Good question I am curious too? No answers? Come on now someone wants to share with us what they know?

  4. #3
    Platinum Member BigSteve's Avatar
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    Ok, First what kind of hull, post pic

    Our group runs tunnel hull boats. I/O, twin I/O, O/B, twin O/B.

    Most of the single I/O or O/B we used Lenco/Bennett tabs over the tunnels

    We lower the tabs for a better hole shot and control bow rise

    The twins used a big plate between the tunnels and drives.

    The big ocean Yacht runs plates that follow the V of the hull
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    Last edited by BigSteve; 07-16-2014 at 03:53 PM.
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  6. #4
    Junior Member Lavey24's Avatar
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    I have 12" Eddie Marine tabs and they are mounted flush to the bottom surface of the V hull and work fine. I heard that the reason some 'V's have them mounted horizontal is less drag at high speed with less effectiveness as the tradeoff.

  7. #5
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    Quote Originally Posted by Lavey24 View Post
    I have 12" Eddie Marine tabs and they are mounted flush to the bottom surface of the V hull and work fine. I heard that the reason some 'V's have them mounted horizontal is less drag at high speed with less effectiveness as the tradeoff.
    Now that makes a lot of sense there Lavey2 thanks! I wonder if trim tabs on a 21 foot shockwave skier with 496 MAG would help out keeping the nose down in a lot of that Havasu Chop? This last Saturday felt like 4th of July out there. At one point between Pirate's Cove and Needles there was about 30 boats in a row coming south pretty hard and we were going north at a pretty good clip. "HOLD ON EVERYBODY GONNA GET ROUGH!" and it did! Wouldn't a set of trim tabs allow me to cut through all that chop better as long as it didn't get too big and start coming over the nose? Or are trim tabs on a 21' ski boat that I like to ski behind and run wide open some over kill?
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  8. #6
    Junior Member Lavey24's Avatar
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    They also help to level the boat side to side when one or two too many adults sit on one side of the boat. I also go to big lakes and they help with a cross wind, to keep the boat level. With them, I can plane at 22mph and can wakeboard, with no bow rise, without them, full throttle bow up until about 26-28mph.
    2000 Lavey Craft 24 Nuera Cuddy 502 Mag MPI

  9. #7
    Senior Member f_inscreenname's Avatar
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    Maybe one of the first sets of trim tabs / K Planes ever made (1967) and they run with the hull.

    A winner is just a loser that got up and did it one more time.
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  10. #8
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    This is how mine are mounted.

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  11. #9
    Senior Member Wizard's Avatar
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    Quote Originally Posted by BigSteve View Post
    Ok, First what kind of hull, post pic

    Our group runs tunnel hull boats. I/O, twin I/O, O/B, twin O/B.

    Most of the single I/O or O/B we used Lenco/Bennett tabs over the tunnels

    We lower the tabs for a better hole shot and control bow rise

    The twins used a big plate between the tunnels and drives.

    The big ocean Yacht runs plates that follow the V of the hull
    What benefits does the single large tab do on he twin boats? Is it fixed or adjustable?

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