Making an Outboard Surface Drive

Discussion in 'Surface Drives' started by east texas hunt, Sep 26, 2009.

  1. east texas hunt
    Joined: Sep 2009
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Texas

    east texas hunt New Member

    Does anyone have any pics or parts info on making an outboard surface drive from a horizontal shaft mower engine? It is for a 15ft flatbottom.

    Thanks for your help.
  2. sandhammaren05
    Joined: May 2009
    Posts: 410
    Likes: 19, Points: 18, Legacy Rep: 138
    Location: Texas & Austria

    sandhammaren05 Senior Member

    Why bother? You'd have to run the shaft straight out the transom parallel to the boat bottom, would need gears because the motor is elevated, and gears eat up hp. Also, you'd need a prop designed for surfacing. Simply buy any 2 stroke outboard of hp range you want, you could cut off the skeg if you want (I wouldn't), relocate the water pickup underneath the gearcase hub, and buy a cleaver prop of right dia.x pitch for the motor. Mount the motor as high as you want to, modulo that it still pumps water. If you contact Ron Hill in Calif. then he can probably respline a small cleaver or appropriate round eared surfacing prop to fit your propshaft. He does that all the time. E.G., resplines Yamaha cleavers to run on an OMC 35.

    I'll be back in Tx. in Aug.
  3. Erich_870
    Joined: Feb 2009
    Posts: 86
    Likes: 2, Points: 0, Legacy Rep: 29
    Location: Juneau, Alaska

    Erich_870 Junior Member

    You want to build a short tail mud motor I take it?

    There's been a little discussion on the forum, but most of the surface drives on here are racing machines and use highly engineered compenents and props.

    Here is a very imformative, DIY thread about home built short tails. Small Hp Surface Drive

Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.