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  1. #1
    Join Date
    Aug 2016
    Location
    Holland, Michigan
    Posts
    45

    Default Pontoon hydrofoil that stops ventilation??

    I've got a 21 ft.Suntracker pontoon with a 12 1/2" x 9" three
    blade prop. Rpm's are 5500(perfect) SPEED 16mph (perfect)
    the "top" of the prop blades are 1" below the bottoms of the
    pontoons. And I still get prop blow out at wide open throttle.
    the engine is as low as it can go. I lowered the whole engine
    pod an inch with spacers. I put on a SE SPORTS 200 hydrofoil.
    i still get w.o.t. Blowout!�� I tried a 11 1/2" x 8" four BLADE prop and only got 4000 rpm's.����
    HAS ANYBODY EVER MOUNTED A HYDROFOIL ON A PONTOON OUTBOARD THAT ELIMINATED BLOW OUT AT W.O.T ???

    *my motor is a MERCURY 40hp 2 stroke...20" long shaft.
    I have no unusual water spray behind the pontoon currently.
    (the four blade gripped the water better, but still blew out to.)
    Last edited by Howmaster; 06-04-2017 at 11:23 PM.

  2. #2
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,195

    Default Re: Pontoon hydrofoil that stops ventilation??

    Ayuh,.... Hydro-foils tend to raise the motor in the water,...

    Hard to believe any foil will help with prop blow-out,....

    Sounds like it needs to be deeper, not shallower,...
    Any Grease is Better,... Than No grease at All....

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