Dual Miniature Surface Drives for 12' Catamaran?

Discussion in 'Surface Drives' started by aggieh20, Dec 17, 2009.

  1. aggieh20
    Joined: Dec 2009
    Posts: 2
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    Location: Texas

    aggieh20 AggieH20

    Hello, I am new to the thread. I am building a miniature offshore racing catamaran that has a single stepped hull. It is being built from fiberglass. LOA is 11' 6" and has a beam of 4'. Step is 1/4" that is located 54" from stern.

    I am wanting to run a 80hp twin cylinder Kawasaki 750cc jetski engine mounted in the center of the boat. I have designed a pulley system to run two surface drives. They can be counter rotating or rotate the same direction. I plan on running the new three blade go devil props.

    Question 1.How can I calculate the correct angle and or location that the drives need to be in so that I am not cutting holes time and time again in my hull to get it right?

    Question 2.Is it feasible to not run counter rotating props since there is not a three blade prop available in the counter rotating form from go devil?
     
    aggieh20, Dec 17, 2009
    #1
  2. fishon91
    Joined: Dec 2007
    Posts: 43
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    Location: wishin i was in florida, LA

    fishon91 Junior Member

    can't help you with your first question, but i notice that these guys (a reputable surface drive,not mud boat, company) use counter rotation, and use a different style prop. i know more about go-devil than i do about arneson, a weed shearing prop is probably not what you are gonna want to race offshore.

    i can say that you are making a good decision using surface drive, just make sure you get it all set right or it'll be pointless.

    show pics when you're done please
     
    fishon91, Jan 9, 2010
    #2
  3. Frosty

    Frosty Previous Member

    You must use counter rotation. I don't like the sound of your pully idea ,can you show Pics, 80HP is a bit much for belt unless you mean toothed belt!!!

    Angle is 0 if you can get it, the configuration of the boat and your drive will be the decisive factor for that. 5 will be ok.

    Don't skimp on shaft thickness, what are you think on rudders? Or rudder.
     
    Frosty, Jan 9, 2010
    #3

  5. aggieh20
    Joined: Dec 2009
    Posts: 2
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    Location: Texas

    aggieh20 AggieH20

    I have not yet decided on steering. I am in the process of designing a unit similar to arneson that allows for the surface drive to turn. I will be able to set the drives at any angle I choose. Will post pics when further along. Thank you for the input.
     
    aggieh20, Jan 9, 2010
    #4
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