Japanese liftable propellor shaft.

Discussion in 'Boat Design' started by rustybarge, Sep 1, 2014.

  1. whitepointer23

    whitepointer23 Previous Member

    A few weeks ago I delivered a load of steel to the alco suspension factory In melbourne. I am pretty sure they would disagree with your claim.
     
  2. tom kane
    Joined: Nov 2003
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    Location: Hamilton.New Zealand.

    tom kane Senior Member

    The experts say you can not do it, they get very upset and quite abusive .When you have a Pivotal Drive fitted in a trailer boat in practice when the boat is on the trailer it is lifted up automatically by being put on the trailer and when you launch the boat the drive drops down by itself down 20 degrees shaft angle or more.

    When the boat is in the water just start the motor and away you go and you can adjust the depth from the helm if you wish. You do not need a clutch because you can lift the prop up from the water. When you go in shallow water the skeg lifts the drive automatically. With twin rudders that work like a kitchener rudder you do not need reverse as the boat turns in its own length right or left.

    The drive does not need to be locked down as it trailes behind the boat and finds it`s own operating depth. You can use the drive as a surface drive with the suitable prop
    and lock the drive at any depth you choose. It can be used in a Hydroplane if the rules allowed for cornering and speed control and braking.

    If you spent a lot of money you could have all sorts of inovative things like automatic detection of object strike and lifting. The list goes on and on.
     
  3. myark
    Joined: Oct 2012
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    Location: Thailand

    myark Senior Member

    Whitepointer finger
    Stop stalking me including sending your nasty troll messages to my email and stop getting very upset and quite abusive, how ever keep up the good work delivering steel.
     
  4. myark
    Joined: Oct 2012
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    Location: Thailand

    myark Senior Member

    Also the pivotal drive prop turns shallow water weeds into thrust
     
  5. whitepointer23

    whitepointer23 Previous Member

    Your not being stalked. You have copied alco suspension and called it your own. We had the same argument a while ago . china is the only place you can get away with that sort of thing.
     
  6. whitepointer23

    whitepointer23 Previous Member

    Touchy subject is it. Its not all bad. I do like your myark barges.
     
  7. SamSam
    Joined: Feb 2005
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    Location: Coastal Georgia

    SamSam Senior Member

    Steering in the front of a pontoon would seem to get in the way of beaching it and also make for slow, inefficient steering.

    The suspension uses the same technology as the AL-KO does, but there are differences that would seem patentable, if a patent is pursued.

    http://www.alko.com.au/vehicle-technology/product-catalogue/axels/independent-rubber-suspension-irs/

    [​IMG]
     
  8. myark
    Joined: Oct 2012
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    myark Senior Member

    All the advantages of the pivotal drive suits the high performance Myark catamaran, for example the centre wedges towards the back bottom one meter short of the two hulls and then kicks up slightly level with water when planning so it’s skipping across the water like a hydrofoil.
    This centre back part allows better floatation for the compact 160hp inboard to be adapted to the pivotal drive which the pivotal drive that can be imbedded into the back centre hull region that allows to have the Myark torsion suspensions plugged in the sides that have guard shape into the hulls similar to a car and then towed.
    I would not use the conventional torsions as they are heavy, rust and unreliable rubbers that when ware they have to be thrown out, so I have designed the rubber cord to be DIY replaced as well as a grease nipple deep into the titanium axle so it does not damage and keeps weight down,
    This greasing system is superior to bearing buddies.
    Pictured is the grease nipple imbedded in the titanium axle and the other picture shows the rubber cords, and how simple it’s to replace them.
     

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  9. myark
    Joined: Oct 2012
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    Location: Thailand

    myark Senior Member

    The rudders are built into the front hull structures placed slightly back for the hinge structure as you may imagine a rudder on plane but set backwards.
    The pontoon does not plan so this is very easy to do as also they will have knife shaped cutting edge.
    It would look space age and heavy duty.
    As far as torsions suspension, they invented are 60 odd years ago as father brought a new caravan in 1969 with the exact ones they use today.
     
  10. SCHWIMMWANNEN
    Joined: May 2013
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    SCHWIMMWANNEN Junior Member

    I built a boat with a lifting drive shaft.





     
  11. BobH
    Joined: Apr 2015
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    Location: Pendleton, OR

    BobH Junior Member

    Why not mount the engine transversely (athwartship) and use a right angle gearbox with an outboard bottom unit (or marine transmission - rt angle drive - Sillette Sonic bottom arrangement)? If offset from directly right angle to fore/aft line by say 8 or 9 degrees (engine drive shaft +8...bottom unit -8) the unit will swing up clear of the hull yet maintain fore/aft alignment of prop in down position. The rotation for kick-up will not require a universal...the unit rotates around the engine drive line. The required seal would be above waterline (O-ring) that has to handle only the kick-up rotation...no need for a seal on the drive shaft other than that in the leg below. The whole point being the ability to use an efficient diesel engine protected from exposure above waterline inside the hull.

    Two of these mounted on inner hull sides of a catamaran would require no steering mechanism. Steering is by a combination of kick-up rudders and motors.
     

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  12. SCHWIMMWANNEN
    Joined: May 2013
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    SCHWIMMWANNEN Junior Member

    The first technical solution is not going to be good because at the stern of the canoe has a small displacement. It can not be heavier than the solution, which I did. The diesel engine is a lot heavier. The second your suggestion is good but it is only possible when the canoe is connected to the proa (catamarans) And I wanted so much on this engine could not see, I wanted to engine was hidden.
     
  13. alan craig
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    alan craig Senior Member

  14. BobH
    Joined: Apr 2015
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    Location: Pendleton, OR

    BobH Junior Member

    Right. I was replying more to the earlier posts showing installations in heavier craft. I am planning on trying the arrangement I described above on a motorsailer catamaran design...not suitable for a canoe.
     

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

    tom kane Senior Member

    You have a good idea BobH but why don`t you build it or do you have the same problem of financing the project like most of us.
    When you start building then the pitfalls and critics become more obvious.
    Retractable shaft drives make power boating so much more easier on operators and machines and should have been universal years ago.
     
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