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Thread: Thrust and torque angles?

  1. #1
    New Member
    Join Date
    Oct 2018

    Thrust and torque angles?

    Hello, I am mounting my engine and wondering about offset for thrust and torque on airboats. I am used to airplanes, Trikeís, etc.. and itís usually 1.5/2. Degrees right and down to compensate for thrust acceleration and torque. Or up and left/ right if a pusher with whatver gearbox. My question is do I set the thrust line perpendicular to hull bottom to start testing? And what do most guys do about torque correction on mini boats? 1, 2 degrees offset?

  2. #2
    Join Date
    Oct 2016
    jacksonville fl

    Re: Thrust and torque angles?

    mount engine level with bottom of boat and make sure you can adjust front or back of engine up or down if need be. never seen a mimi airboat with enough power and big enough prop to worry about torque roll.
    Arrow belt drive
    marty bray 116 mini pro
    solex 32/36
    weber 32/36
    solex 34 pict 3
    weber 34 ich
    Razor x 3 blade

  3. #3
    Super Moderator Corky's Avatar
    Join Date
    Jul 2014
    Susquehanna river, Dauphin, Pa

    Re: Thrust and torque angles?

    It'll be interesting to see just where your build will end up with the thrust angle from the initial setting as Bobby has suggested...Your build is much different than most builds so prepare yourself for some fine tuning to get it correct...

    Aluminum .120 14' X 76" hull
    Teledyne 4a084-4 engine
    Circle S 1.69:1 reduction
    67" Whirlwind "Razor X" prop


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