The Too-hard Basket

Discussion in 'Powerboats' started by tom kane, Dec 13, 2003.

  1. tom kane
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    Questions for further research.
    How do we push a boat suitably designed boat equiped with
    surface piercing propellers,efficiently up to their efficient operating
    speed of 40 knots
     
  2. gonzo
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    gonzo Senior Member

    Put enough power
     
  3. tom kane
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    That is saying that power removes the ineffiency of a propeller
    or a propulsion system.A propulsion system needs to be efficient
    at all speeds as the power source usualy relies on a motor which
    develops HP related to RPM.We do not want to move our boat
    at max power all the time.tom kane
     
  4. gonzo
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    gonzo Senior Member

    No, that is to say that to run surface piercing propellers you need enough power to achieve speed of over 40 knots. A boat that has a top speed of less than 50 knots sees no overall advantage. Who doesn't want to run their boat at max power all the time? In my experience, people who buy high performance boats run them wide open most of the time.
     
  5. tom kane
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    tom kane Senior Member

    If the only obvious solution to the question is add more power.
    Then other solutions must be.Non-obvious.New and have a novel aspect.Be a new combination giving an advantageous
    power conversion.Contain an element of un-expected
    results or movement.And possibly be patentable.
    Power boat speed records are data from full scale models in
    practice.Not theory or computer models.tom kane
     
  6. SailDesign
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    Location: Jamestown, RI, USA

    SailDesign Old Phart! Stay upwind..

    Tom - let me guess.......

    Ahah! You install one of your patented "in-again-out-again" drives.

    Am I right? What do I win?

    ;-)

    Steve
     
  7. gonzo
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    Location: Milwaukee, WI

    gonzo Senior Member

    Tom Kane:
    If you have another "go fast" solution I'd like to hear about it. Power does not remove the inefficiency of anything. There are always power losses. When you decide what your operating speed range will be, it determines the design and choice of drive systems. One thing doesn't change: speed requires power.
     
  8. tom kane
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    I appreciate your tolerance Gonzo.
    I do not believe surface and subsurface drive all in one is new.
    What is new is a propulsion system which will let you decide
    how fast you will make it go and how you will use it.You can have many options with advantages over present systems.A trial unit could be installed in a boat in a few weeks.A much more sophisticated one could be developed.Remember millions have been spent on present systems.This one..very little.tom kane.
     
  9. gonzo
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    gonzo Senior Member

    This is another post of your mistery drive. Sorry, but I don't believe it exists.
     
  10. tom kane
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    That is ideal Gonzo,if it did exist then it may not be new.
    This one is different.On the subject of speed and flexability of a propeller design.Even in 1950 the power boat Slo-Mo-Shun
    idled at 45 MPH and accelerated from 80 MPH to 140 MPH
    in 12 seconds.Top speed 160.32 MPH.If you scale it down
    it is still not bad for everyday use.I do not wish to be mysterious.
    tom kane.
     
  11. gonzo
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    gonzo Senior Member

    What kind of drive system and power did it have, do you know?
     

  12. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    Hull length 28 feet.Allison engine.Step-up gbox.A streight bladed prop by Harold I "HI" Jackson.Produced a 40 ft rooster tail behind
    boat.tom kane.
     
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