mount outboard

Discussion in 'Outboard Maintenance' started by pescador72, May 12, 2009.

  1. pescador72

    pescador72 Well-Known Member

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    I'm trying to mount my outboard on my CMC tiltntrim unit and at it highest position the cavitation plate is still about one inch below the bottom. Is this going to create any noticeable drag or loss of performance? The tilt n trim unit is about 5 inches set back.

    Thanks,

    Mario
     
  2. Brett

    Brett > PRO STAFF <

    previous post:

    http://www.microskiff.com/cgi-bin/yabb2/YaBB.pl?num=1235777190
     

  3. pescador72

    pescador72 Well-Known Member

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    thanks for the link Brett.

    But it addresses advantages and such of running a jack plate. What I have is a tilt and trim unit. And the highest I feel comfortable raising it, is still less than an inch below the keel, for the cav plate that is. Will there be noticeable drag?

    Anyone else weigh in?

    Thanks
    Mario
     
  4. Tom_C

    Tom_C Well-Known Member

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    Yes, you will have around 3 inches more of the motor in the water than you need to. You may be losing 2 to 5 mph.
     
  5. Brett

    Brett > PRO STAFF <

    The link covered more than jack plates, it also had links to how
    to properly install outboards at the correct height on your transom.
    Including this one:

    http://www.marinepartsman.com/installing-an-outboard-on-your-boat.html

    The more of your outboard that is in the water,
    the greater the drag created. As shown in the linked post
    diagrams, most hulls are set up with the cavitation plate
    at or just a hair below the bottom of the transom.

    An inch below the transom is not that big a deal,
    but if you're looking for the best performance,
    you'll need to mount a bit higher.
     
  6. pescador72

    pescador72 Well-Known Member

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    thank you very much guys