Thai Longtail/mudmotor With 6hp Lifan/honda

Discussion in 'DIY Marinizing' started by pistnbroke, Feb 26, 2009.

  1. pistnbroke
    Joined: Jan 2009
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    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    they are identical to the honda /lifan /etc /etc ....so no problem lots of posts on them recently on this and weedeater conversion posts....
     
  2. Ed-H
    Joined: Mar 2010
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    Location: Montana

    Ed-H Junior Member

    PB, can I ask your opinion on using a 7x9 prop on a 4hp 4 stroker? Could it be run w/o reduction, or do you think it would be better with? The boat is a 14 sneak/layout design.
     
  3. pistnbroke
    Joined: Jan 2009
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    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    too much maybe start with or 7 x4 and bend the blades if neccessary ..for direct drive
     
  4. Ed-H
    Joined: Mar 2010
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    Location: Montana

    Ed-H Junior Member

    Do you think it would work if I were to gear it down like you did?
     
  5. pistnbroke
    Joined: Jan 2009
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    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    depends if its a left or right hand prop ..if it right hand I think my design is good because it gives rigidity to the system without excess weight ...you have to make sure the link between the motor and shaft cannot bend with a direct drive which takes a lot of angle lron engine to shaft ...you can build my design with U bolts .... simple plate with tube underneath U bolted to a 1/4 inch steeel or ali plate ......you still have the same bearing problems to deal with ...
     
  6. siberian
    Joined: Apr 2010
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    Location: boston

    siberian New Member

    mudd motor on surfboard

    Hey Notsofast, I'm looking to put a mudd motor on my surfboard. We need to talk. How much does yours weigh?
    I'm got a Starboard Go 180 liter displacement. It's 8' X 3'.
    Could you please post some pix.
    Thanks
     
  7. siberian
    Joined: Apr 2010
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    Location: boston

    siberian New Member

    mudd motor for surfboard

    Hey Notsofast, I'm looking to put a mudd motor on my surfboard. We need to talk. How much does yours weigh?
    I'm got a Starboard Go 180 liter displacement. It's 8' X 3'.
    Could you please post some pix.
    Thanks
     
  8. notsofast
    Joined: Nov 2009
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    Location: Philippines

    notsofast Junior Member

    Hi Siberian, I originally tried a surfboard (40lbs) with a 3Hp outboard (35lbs) but couldn't get it up on plane. The surfboard was 12-ft long by 2-ft wide. This idea was junked.

    Then I tried a 200cc Honda clone (new carb, advanced the ignition timing, high comp cyl head) with a 3-ft wide by 12-ft long wooden "surfboard". This worked quite well and can do 25mph consistently, as measured with a gps. Took me several trials with different props to get to that speed. Some pix here -----> http://www.pinoyboats.org/forum/viewtopic.php?t=1289&postdays=0&postorder=asc&start=120

    180 liter? Maybe 180cc?

    Good luck with your build!
     
  9. notsofast
    Joined: Nov 2009
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    Location: Philippines

    notsofast Junior Member

    Here's a couple of props that were tried. Fastest speed was attained with the 2-blade, hi-rake prop.
     

    Attached Files:

  10. rmenasco
    Joined: May 2010
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    Location: Florida

    rmenasco Junior Member

    the bottom

    pistnbroke, could you please show some photos of what your design looks like under the motor? I am interested in your design.
     
  11. muddin redneck
    Joined: Jun 2009
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    Location: Muscatine, Iowa

    muddin redneck DO IT IN THE MUD!!!

    notsofast, where did you buy your props for your motor?
    thanks,
    muddin
     
  12. pistnbroke
    Joined: Jan 2009
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    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    just too bits of ange about 3/4 x 3/4 to make the welding easy ..you could use U bolts if you leave space under the engine but main mistake I made was not to get the centre of gravity of the engine over the shaft ,,,,so mine is a bit lob sided.....you need the shaft nearer to the cylinder side for balance
     

    Attached Files:

  13. rmenasco
    Joined: May 2010
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    Location: Florida

    rmenasco Junior Member

    Thanks!

    pistnbroke,

    Thanks for the photo of underneath the engine that was really helpful! I am a newbie at this so I have a few more questions for you. I just finished building a "hybrid" duck boat from www.hybridduckboats.com . I have attached a photo of the boat below. Do you think I would need the same 10x10 prop if I used a 2.5hp? Or should I go with another prop size? Also, what is the set up on the bearing closest to the sprocket?

    Thanks in advance!

    [​IMG]
     
  14. pistnbroke
    Joined: Jan 2009
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    Location: Noosa.Australia where god kissed the earth.

    pistnbroke I try

    the size of the prop depends on the engine power so if yours is 2.5 and mine is 6.5 then you are going to need to reduce the pitch in proportion ....probably something like a 8in x 4 pitch.......similarly you may get a bout 8 kts

    the bearing drawings are on an earlier post but its a sealed ball bearing 8mm x30 or similar ( my shaft was 8mm )
     

  15. rmenasco
    Joined: May 2010
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    Location: Florida

    rmenasco Junior Member

    hybrid

    Thanks for the info! I may just go with the 6.5 since it has electric start and it only weighs 8 more lbs. How fast does urs go? And what size/type of boat do you have it on?

    Thanks!

    Robert
     
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