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Thread: 15hp Hydroplane

  1. #11
    Sam Cullis Mark75H's Avatar
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    Probably not
    Since 1925, about 150 different racing outboards have been made.


  2. #12
    Team Member JohnsonM50's Avatar
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    Quote Originally Posted by Bradkitcher View Post
    I can do 40.4 mph with a 9.9hp tohatsu (advanced timings and linkages so probably about 12 hp) semi surfacing on a flat bottomed punt with two 160 Lbs men in it.
    Would converting the hull to a hydroplane hull give me 42 mph?
    Thoughts??
    I did overlook the modern loop charged motors thinking instead of cross flow motors. The Tohatsu's all seem to be fast in their size range. Adding sponsons would likely slow ya down.

  3. #13
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    So the fastest 9.9hp or 15hp is which engine?

  4. #14
    Team Member JohnsonM50's Avatar
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    Quote Originally Posted by Bradkitcher View Post
    So the fastest 9.9hp or 15hp is which engine?
    Dont know, the Tohatsu could be the fastest fishing motor. It would be interesting to see how one went with an adapted Merc AB, or Hotrod gase case on a good A boat As is tho, the production 'racer' 15ci motors are fast, The 15ci American Hot Rod, the Champion Hot rods, OMC & Merc A motors all can go near 60 if not more. Even tho 40+ is real good, 20 more is alot to ask of any small motor. How fast will that go with just you onboard?

  5. #15
    Sam Cullis Mark75H's Avatar
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    Qualify ... they can go this fast on a lightly loaded race boat ... the same speed can not be achieved with other boats or loads
    Since 1925, about 150 different racing outboards have been made.


  6. #16
    Team Member JohnsonM50's Avatar
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    Quote Originally Posted by Mark75H View Post
    Qualify ... they can go this fast on a lightly loaded race boat ... the same speed can not be achieved with other boats or loads
    Right, sure wouldn't make a tin boat go like that, thanks Sam

  7. #17
    Team Member capnzee's Avatar
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    Question: I assume you registered 40.4 mph with 320 lbs of meat on board, a basic flat bottom (punt) jon boat _ with a GPS . Did you make a back-up run in the opposite direction?

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    Quote Originally Posted by capnzee View Post
    Question: I assume you registered 40.4 mph with 320 lbs of meat on board, a basic flat bottom (punt) jon boat _ with a GPS . Did you make a back-up run in the opposite direction?
    Correct both ways. Correct weight. Freshwater non tidal. With a gps. All I need is 1-5 per cent more speed.

    Brad.

  9. #19
    Team Member capnzee's Avatar
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    Great job Brad, standard lower unit? Maybe thats what the J boat drivers ought to be running, I understand that the lower units alone are around 2000 bucks for the new J boats. Mighty expensive for the young'uns to get started.

  10. #20
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    Quote Originally Posted by capnzee View Post
    Great job Brad, standard lower unit? Maybe thats what the J boat drivers ought to be running, I understand that the lower units alone are around 2000 bucks for the new J boats. Mighty expensive for the young'uns to get started.
    Not really standard but original gearbox. We coat them in rubber so we can hit rocks. The shape is definately less streamline than a standard box.

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