wanted pics of fixed tunnel tabs
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wanted pics of fixed tunnel tabs

  1. #1
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    Default wanted pics of fixed tunnel tabs

    built a set of fixed tunnel tabs for my 22 daytona to get rid of the porpuss at aroung 80 was wondering if you guys have them fixed to the hull like a flat bottom cav plate or on some kind of hing either way they will flex for adjustment lets see some pics thanks and what are you guys running the tabs at 1/8 up or down

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  3. #2
    It's what we do BDMarine's Avatar
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    I'm not sure fixed tunnel tabs are how I would try to solve a high speed porpoising problem. Drive height and propeller design would be where we start.
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    B & D Marine Performance
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    Ive talked with every one rhe daytonas have a porpus and they put a set of fixed tabs 1/8 down and it fixes it ive tried every prop 4 blade 5 blade hydromotive i test props for augie at cutting edge and the drive has a imco lower the drive has no eoom to move up or down and its basicly on smooth water get some chop and its managable

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  6. #4
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    The boats you typically see these fixed tunnel plates mounted on are built with a relief in the top of the tunnel to accept the plate. There is no need for a hinge style mount to the transom, as the plate runs straight underneath the tunnel and is thru-bolted. Turnbuckle supports mount the plate to the transom for slight adjustability. You can somewhat see what I'm talking about in these pics from a Stoker I had a few years back. A stainless piano hinge would work fine if your hull doesn't have the reliefs in the top of the tunnels for the plate to fit in.
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  7. #5
    It's what we do BDMarine's Avatar
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    Quote Originally Posted by tease me View Post
    Ive talked with every one rhe daytonas have a porpus and they put a set of fixed tabs 1/8 down and it fixes it ive tried every prop 4 blade 5 blade hydromotive i test props for augie at cutting edge and the drive has a imco lower the drive has no eoom to move up or down and its basicly on smooth water get some chop and its managable
    We have done extensive work on Daytona's including the 21. We have (2) 21's in here right now. My point was not whether the fixed tunnel tabs will control the porpoise, it is, that it is not the ideal solution. The fixed tunnel tabs will have some effect on the boat at all speeds. They are the least expensive option and will help with the porpoise. I'm just not a fan of anything "fixed" that controls boat attitude.
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    B & D Marine Performance
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  8. #6
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    bnd i now were your comming from i now the first solution would be out drive placement / x dimension but that is a hole lot of work and money i do believe that the motor is in the standard possition from what people have seen and said the motor doesnt sit to high in boat nor to low but really / what do i no if the out drive was down and level with boat and i put a straight edge on the outer sponsons level with what should it be from prop shafts thanks for all your input

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