Lawn Mower Outboard

Discussion in 'DIY Marinizing' started by sonycrayfish, Feb 16, 2007.

  1. sonycrayfish
    Joined: Jan 2007
    Posts: 4
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    Location: Young America IL

    sonycrayfish New Member

    I am going to start a project to convert a push mower into a little outboard motor for my boat at school. I currently have got two quality Briggs and Straton engines to use. Ones a 4 horse and the other is a 3 1/2 horse. I'll use which ever one I get running, though I'd rather use the much smaller 3 1/2 horse. Both are vertical shaft. The 4 horse has got front wheel drive and I was wondering if I could yank out the gearbox that turns it from vertical shaft to horizontal shaft and use it underwater. I think this would work best to keep it a simple project, but it might slow down the prop too much. Please correct me if I am wrong. What major parts do I have to cover up to prevent water damage? Does anybody have any ideas? I'd appreciate any help. Thanks!

    I'll post some pics soon.
     
  2. Syed
    Joined: Sep 2005
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    Location: Lahore, Pakistan

    Syed Member

    Propeller at the end of the ninety degree drive and engine on the other end is definitely workable as is in the case of almost every outboard motor.
    Another way to go with this experiment could be to attach a water pump with the vertical Briggs, just above the water line and lowering the suction pipe to the bottom line.
    A lot depends on the resources available.
     
  3. sonycrayfish
    Joined: Jan 2007
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    Location: Young America IL

    sonycrayfish New Member

    I'm gona sticks with the properler idea, but what would I have to do to the gearbox to make it work under water? I plan on welding it straight to the shaft. Would this work? I got the 4 horse running, but I'm still working on the 3 1/2 horse. I heard somewhere I neeed a flywheel for it to work, is this true?
     
  4. sonycrayfish
    Joined: Jan 2007
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    Location: Young America IL

    sonycrayfish New Member

    I need help people! Pics will ome when my USB ports get fixed!
     

  5. cookiesa
    Joined: Mar 2007
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    Location: Launceston, Tasmania

    cookiesa Senior Member

    try doing a google for victa outboard Australia. They were made here for a while (similar to a very crude jet. Prop was on a long shaft under motor and went in to an assembly. It effectively pumped water from under the "outboard" and out at 90 degress for propulsion. Not very efficient but an eye turner!
     
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