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Thread: motor mount


  1. #1

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    motor mount

    this is the second motor mount that has broken on Logans airboat
    this is 1/8" aluminum angle the first was exactly the same break.
    built new ones out of 1/4" plywood
    the engine is only a Fox .25 bbs
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  2. #2
    RS 38-40's Avatar
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    RE: motor mount

    Looks like a vibration problem . Maybe the prop is out of balance .

  3. #3

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    RE: motor mount

    its only the one side that breaks (from front of boat its right side)
    the motor has been changed from this picture from OS.20 to Fox .25
    had no problems with .20 other than fuel/oil leaking out of front of crank and around strap on exhaust

    checked prop balance its fine but i think plastic spinner is out of balance has different size screws
    going to pickup metal nut spinner
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  4. #4

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    RE: motor mount

    If you did'nt use a break to bend the aluminum chances are the bend area is full of small cracks that will cause the piece to break with the vibration from the engine. To bend aluminum without the weak areas you have to use the right radius for the thickness of the metal. Someone on here will be able to help with the problem. Dennis

  5. #5

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    RE: motor mount

    its 1/8"x1"x1" angle i bought at lowes

  6. #6
    RS 38-40's Avatar
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    RE: motor mount

    One thing you might want to look at when you make another mount is that the holes are not oversize and that they are lined up with the motor holes . It also might help to add a doubler under the motor to give it a little more meat . The angle you are using is not usually very hard and any movement will elongate the holes and put more stress on the mount . A prop doesn't have to be out of balance much to cause problems .

  7. #7

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    RE: motor mount

    borrowed a prop balancer from a guy at work and prop is out of balance
    got where it will stay horizontal but put vertical it is out of balance.The center hole is not centered.
    bought new prop and spinner today and balanced it .
    the holes in aluminum were the same size as the ones on motor
    and the bolts were still tight . the break line follows the edge of the motor mounting flange
    like i said this is the second one broken. mount now is 1/4" plywood

  8. #8

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    RE: motor mount

    place a thin strip of wood or even better, rubber between the engine and the aluminum
    Catch a Gator by the Tail and hang on for the Ride!
    Cajun Gator Airboats, M.AB.A


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