Lawn mower engine outboard motor?

Discussion in 'DIY Marinizing' started by Jeremy Clarkson, Aug 17, 2011.

  1. Jeremy Clarkson
    Joined: Aug 2011
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    Jeremy Clarkson Junior Member

    I have a really nice new electric start 6.5 hp lawn mower engine.
    But it is vertical shaft.

    Is there like a 90 degree elbow gearbox thing I can buy that I could bolt to the shaft that would make it so I could put a horizontal propeller on it.

    I've seen something like this for drills where for getting into tight places the drill mounts to a 90 degree transfer and then you can drill things bent

    what is this called?

    what about using a chain?
     
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  2. CatBuilder

    CatBuilder Previous Member

    I'd be VERY interested in one of these as well. Some other uses for them.
     
  3. Jeremy Clarkson
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    Jeremy Clarkson Junior Member

    yeah I cant find what I'm talking about because I have no idea what it's called
     
  4. CatBuilder

    CatBuilder Previous Member

  5. pistnbroke
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    pistnbroke I try

    sorry are you missing the point .....a right angle drive ..its called an outboard leg .....you get reverse too ....
     

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  6. PAR
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    PAR Yacht Designer/Builder

    Agreed, you can turn the output on a vertical shaft engine to horizontal if you want, but the wise fabricator just uses a horizontal engine in the first place and eliminates the need for the 90 degree leg, not to mention the power loses that come with it.

    I've used live axles from cars to make this setup on rare occasions, just remove one of the axle tubes and weld it closed and U joint the thing to what ever you're attempting to drive. The last one I did was many years ago and I used a small Ford rear. It worked, but was noisy and heavy.
     
  7. pistnbroke
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    pistnbroke I try

    have I missed something this is only 6.5 hp and he wants a propeller ...so fit it on a leg ..????/
     
  8. PAR
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    PAR Yacht Designer/Builder

    Piston, I think he wants to make a straight shaft setup, but use his vertical lawn mower engine, which is an interesting choice in itself. It could be done, but after you count up the loses from the output direction change, you'll be lucky to have 4 HP at the prop.
     
  9. Dirteater
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    Dirteater Senior Member

  10. Mr Efficiency
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    Mr Efficiency Senior Member

    The noise of an air-cooled engine is wearing, IMO.
     
  11. Jeremy Clarkson
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    Jeremy Clarkson Junior Member

    Yes exactly like that picture

    How would it lose that much power?

    I want to do this because I have nothing else to do with a vertical motor
     
  12. pistnbroke
    Joined: Jan 2009
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    pistnbroke I try

    Vertical shaft motor = outboard
    Horisontal shaft motor = longtail
    If you go with either of the above you can KISS and cheap But is the last S the problem ?
    Suggest you google mud motors which have horisontal shaft motor and various means of driving the prop ....V belts etc
     
  13. FMS
    Joined: Jul 2011
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    FMS Senior Member

    Your idea of using an outboard leg for a DIY isn't stupid at all. It's been done a number of times.

    The OP has a thread about a light kayak hull and mentions wanting a shaft here.

    Maybe he can tell more about the boat this DIY setup is for.


    Could always trade it to someone who has nothing else to do with a horizontal motor :cool: Often cheaper than monkeying around trying to make a square peg fit into a round hole.
     
  14. pistnbroke
    Joined: Jan 2009
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    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    FMS I know I am not stupid ..but if its a light Kayak this thing is too heavy anyway.
    +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    unsubscribed ....there are non so blind as those who cannot see ....bye
     

  15. Harpo
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    Harpo New Member

    If your engine is designed for a walk-behind lawn mower, it will not run properly without a blade. The flywheel on walk mowers is light aluminum, and the engine needs the mass of the blade to act as additional flywheel weight, carrying the rotation through the exhaust/intake cycle.

    There are some vertical shaft engines with a heavy flywheel - these are used on riding mowers and tillers.

    If you're not sure, try and start it without a blade. If it kicks back and pops, or tries to drag the starter rope back in, it's a light flywheel!
     
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