GOP Home Build

Discussion in 'Boat Design' started by schultzfactor, Oct 25, 2013.

  1. schultzfactor
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    Location: Rotorua New Zealand

    schultzfactor Senior Member

    Yep those are the hulls
     
  2. schultzfactor
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    schultzfactor Senior Member

    The Bow!!!!

    Lengthening and creating bow tunnel.
     

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  3. Yobarnacle
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    Yobarnacle Senior Member

    If it performs as good s it looks, you got a winner! Nice work.
     
  4. SamSam
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    SamSam Senior Member

    Have you put any thought into the motor mount?
     
  5. schultzfactor
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    schultzfactor Senior Member

    Yeah I'm not a Hundy on that yet. I have a bracket for it but thought of modelling two tubular Ali brackets? I need to see what the tipping point is first to see firstly how much weight I can throw on the back and then how far back I can put it. Any thoughts?
     
  6. schultzfactor
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    schultzfactor Senior Member

    Thanks yobernacle, hope so too.
     
  7. SamSam
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    SamSam Senior Member

  8. SamSam
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    SamSam Senior Member

    It's hard to say,you haven't posted an photos of the back end of the boat. Is the plan still 60-90 hp?
     
  9. Mr Efficiency
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    Mr Efficiency Senior Member

    I just hope it doesn't explode like a shower of shenanigans when it hits a decent wave ! Ok, it might have great structural integrity under that less than convicing exterior, can't judge the book by it's cover, etc.
     
  10. Yobarnacle
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    Yobarnacle Senior Member

    British Seagulls were great little motors. Shame GB outlawed 2 cycle outboards and put them out of business. Seagulls were never speedboat motors. Suitable for dinghys in smaller sizes and for low speed pushing of heavy workboats and yachts upto 10 meters, with the Century series motors. I have several Seagull Century 5 blade hydrofan props. My homemade azimuthing electric drive uses the lower unit off a Seagull Century Plus, has 4:1 reduction gear inside.
     
  11. schultzfactor
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    schultzfactor Senior Member

    SamSamLooks pretty cool, would be great in our harbours for fishing with the kids.
    I'll post some pictures tomorrow evening of the stern and transom. Got an invite to go fishing tomorrow so no work on the boat.

    Yobernacle, I have a really cool old Mcculloch outboard that would be good for an electric conversion. I just can't seem to get it going, and its tough to get parts in NZ. What kind of electric motor would you use?

    Mr. Efficiency: if i listened to folks like you my whole life, I would have layed in a corner and cried, but I'm still trucking along and doing ok.
     
  12. schultzfactor
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    schultzfactor Senior Member

    SamSam: I was actually thinking of 2X40hp?
     
  13. Yobarnacle
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    Yobarnacle Senior Member

    That would depend on a the answers to a number of questions.

    Do you want a cheap conversion? Or state of the art hi-tech, synomonous with expensive?
    Do you want batteries as a power source? Or will a small generator meet your needs?
    Our present tech level, liquid carbon fuels are still more efficient at storing more energy than batteries.
    How many hours do you plan to be out on the water away from recharge electrical source?
    How much HP is the McCulloch rated at? Propeller diameter and pitch? Gear reduction ratio in lower unit?
    How large a boat do you want to propel with this electric motor and at what speed?
    I can give you some simple options if I knew these answers.
    If you want to get gnarly over the possibility concepts, you need to enlist an engineer or two. :)
     
  14. schultzfactor
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    schultzfactor Senior Member

    Not really to push anything at the moment, but have a few 220v electric motors lying around that could be converted to 12 v. It's a 7.5 HP. Cod be a cool battery powered project? I'll get back yo you on the prop size. As I understand it, electric motors dont need near the HP as petrol? Very torquey.
     

  15. Yobarnacle
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    Yobarnacle Senior Member

    Horsepower is horsepower. But to avoid any arguments about theory, just take a clue from the experts. Hybrid car mfgs downsize the electric drive motor to about a third of the horsepower of the gas engine on the same model car non-hybrid vehicle.

    Are those single phase or 3 phase 220 volt motors?
    http://www.glen-l.com/designs/special/elecdr12.html
     

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