Japanese liftable propellor shaft.

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

  1. tom kane
    Joined: Nov 2003
    Posts: 1,768
    Likes: 49, Points: 58, Legacy Rep: 389
    Location: Hamilton.New Zealand.

    tom kane Senior Member

    japanese liftable propeller shaft

    Hi myark, model T and a and other vehicles had a propellor drive shaft that had a pivoting device (ball type joint) behind the gear box on a cross member and an enclosed drive shaft inside connected to the diff. This had stabalizing bars to the rear axle and the cross member.
    Because my Patent worked differently and was a new and novel idea and had un-expected results and an improvement on other Patients like mine it was Patentable for me.
     
  2. myark
    Joined: Oct 2012
    Posts: 692
    Likes: 16, Points: 28, Legacy Rep: 57
    Location: Thailand

    myark Senior Member

    Hi Tom
    With a smaller Myark self-trailer catamaran with a designed back bottom end very similar to Bryans Jacksons Carcat, then place this similar design pictured below pivotal drive, but modified more streamline with of course have the propeller end clear at back end similar to your model so propulsion can be used when up position, and why I chose side to side steering not needed and have the front twin hulls with rudders that also have pivotal action if hit the ground.
    A jet boat I had when younger, I towed my friends on their surf boards into large surf and drove almost on the beach as I followed the waves to shore.
    Also pictured is a 3.6x 2.4 Myark folding trailer cat with twins 15 hp outboards that could handle huge waves while cutting through like butter, but could not drive close to the shore like a jet boat.
    With the pivotal drive this can be now done and not lose the HP through the jet units.
     

    Attached Files:

  3. rustybarge
    Joined: Oct 2013
    Posts: 533
    Likes: 3, Points: 18, Legacy Rep: 37
    Location: Ireland

    rustybarge Cheetah 25' Powercat.

    This video is a 'must watch'; showing a lifting propellor shaft on the outside of the hull of a barge:

    http://youtu.be/-hFqhs9ILac

    Thinking:
    On a twin screw boat why not have the two shafts on the outside of the hull on both sides, just like in the video? safety would dictate that the shafts run in tubes.

    You would need to locate the prop end with a ' p' bracket and cutlass bearing, this could be bolted to the transom using Tom's sliding 'jacking plate' idea at each side of the transom.

    This would mean the hull does not have to be altered in any way!

    PS: damn: forgot about 'ventilation' of the props. :(

    [​IMG]
     
  4. myark
    Joined: Oct 2012
    Posts: 692
    Likes: 16, Points: 28, Legacy Rep: 57
    Location: Thailand

    myark Senior Member

    http://youtu.be/-hFqhs9ILac

    The drop down shaft is almost the same I have seen on old large catamaran with a car motor mounted on middle deck where the owner dropped the shaft down on a bit of rope into the water.
    I had a good talk to the boat owner for a while moments before I set of to Great Barrier island with a car on top of the mark 1 model Myark folding trailer barge heading 60 miles out to sea from mainland.
     

    Attached Files:

  5. rustybarge
    Joined: Oct 2013
    Posts: 533
    Likes: 3, Points: 18, Legacy Rep: 37
    Location: Ireland

    rustybarge Cheetah 25' Powercat.

    Is that a Datsun Cherry?
     
  6. myark
    Joined: Oct 2012
    Posts: 692
    Likes: 16, Points: 28, Legacy Rep: 57
    Location: Thailand

    myark Senior Member

    That was twenty years ago and think It was a rusty Toyota that did not want to die, although in end it drowned after I had made my way around Great Barrier island including going up a small tidal river at high tide visiting a hippy commune I knew and then folding the barge up and towing it through the island which I had a tent to go on top turning the Myark into a camper,
    Just before I was about to go back to mainland I stayed one more night and anchored in Blind Bay while visiting a women I knew living in an old shake on the beach.
    It was called Blind Bay for a good reason as the water was like glass that night and thought it was safe to anchor the Myark barge and car on top and get a early start in the morning.
    I woke up in the morning and saw the waves pouring into the bay and could see is a red car top sticking out of the sea which the Myark sank and the car drifted off the top and into the depths.
    I waited for low tide and folded the Myark up into its self-trailer form and my friend towed it ashore as well as the car.
    The bright side of this is, I did not drown when wanting to traveling the Bay Of Plenty for my next step as the Myark was only tacked together and had to bucket water out of the cockpit or I would sink as the swells where huge crossing the Colville channel, for example, in between the swells I could not see the land.
    My dog that cannot been seen in that picture as was on the other side of car was trembling in fear as if the wind came up slightly we are goners as the swell with the slight wind, was started to break into waves.
     

    Attached Files:

  7. tom kane
    Joined: Nov 2003
    Posts: 1,768
    Likes: 49, Points: 58, Legacy Rep: 389
    Location: Hamilton.New Zealand.

    tom kane Senior Member

    japanese liftable propeller shaft

    Hi myark and others there are lots of possibilities and lot of room for expensive mistakes that can be made the story it to check and check again to see if you have got it right, but how do know if you have got it right?
    Einstien`s famous equation that he could not prove to be right and I believe that it still has not been proven..but it is simply just accepted.

    Included is a sketch of a boat I would like. Pivotal Drive, rides on skis that also steer the craft no rudder. I am not impressed with fixed surface piercing drives which are ok just to go fast.

    Hi witepointer, I have been downsizing my image gallery and have thrown out lots of cd`s and found more pics of that drive you asked about but it does have views of as yet unpatented and new parts.

    rustybarg my be interested to know that a local fisherman runs twin surface drives like the longtail boat setup from the gearcase of the outboards for shallow harbor fishing I have not seen it though.
     

    Attached Files:

  8. whitepointer23

    whitepointer23 Previous Member

    If I was going go do what rb wants. I would look at making the boat amphibious so I could drive straight up the beach and park on dry land.
     
  9. whitepointer23

    whitepointer23 Previous Member

    Where did the cama drive end up tom. Are there any being used still.
     
  10. tom kane
    Joined: Nov 2003
    Posts: 1,768
    Likes: 49, Points: 58, Legacy Rep: 389
    Location: Hamilton.New Zealand.

    tom kane Senior Member

    The CAM.A.PROPULSION is still having a facelift and needing new Patents and waiting for a lotto win. It is still unique so far as I know.There are lots of new ideas in the pipeline of Provisional Patents which no one knows about because provisional Patents are not published. Change takes time. There is a lot of competition on the internet and I am one of
    less visable bunch.
     
  11. myark
    Joined: Oct 2012
    Posts: 692
    Likes: 16, Points: 28, Legacy Rep: 57
    Location: Thailand

    myark Senior Member

    Because the Myarks self-trailer speed boat has twin hulls then rudder can go in between the hulls in the back centre region.
    The advantage is when the front end is out of water the rudder is still contact in water also easy to make it a pivotal action when grounded because of the way it can be structured also maybe shaped as a hydrofoil ...
    It could have both versions, one rudder in centre, centre, also build in rudder system in the very front hull structures, like a rudder on the tail end of a plane,
    This would look like a space age design and heavy duty and has the principle you mentioned many years ago like the antique car blinkers that pop out to the side.
    Steering from the very front is better than steering from the back end if a fixed shaft propulsion and suits the Myark folding trailer pontoon with car on top.
    I do not want the Pivotal drive system to go side to side as that mounts to problems and keep to it simple including no rudders in the back end.
     
  12. tom kane
    Joined: Nov 2003
    Posts: 1,768
    Likes: 49, Points: 58, Legacy Rep: 389
    Location: Hamilton.New Zealand.

    tom kane Senior Member

    There is plenty of ideas to keep us all busy for a long time and myark you seem to be making progress. I have all but given up on using conventional rudders to steer a boat particularly surface drive as you must have a very deep rudder to get any effect which cancels out shallow draught, and why I used two rudders to work similar to a kitchen rudder. There are other ways.

    I have had too many scarry experiences to take a conventional boat into the surf so my idea is to have a ground effect vehicle which can hover just above the forces of surf and other objects and almost fly when I can not ride the water surface. I could just about achieve that by converting a decommissioned helicopter to work in ground effect at not an unreasonable cost. I think whitepointer may agree that a new vehicle is needed. Ofcourse the experts say that flying low is dangerous but there are safe ways to do most things and I do not want to go fast. And best of all I do not need to have a pilots license (yet)
     
  13. tom kane
    Joined: Nov 2003
    Posts: 1,768
    Likes: 49, Points: 58, Legacy Rep: 389
    Location: Hamilton.New Zealand.

    tom kane Senior Member

    japanese liftable propeller shaft

    When you search around for ideas about propulsion for your boat there are many thing you have to consider and if you can not find something to suit your needs you have to build you own arangements or modify existing ones and add on what you want.
     

    Attached Files:

  14. myark
    Joined: Oct 2012
    Posts: 692
    Likes: 16, Points: 28, Legacy Rep: 57
    Location: Thailand

    myark Senior Member

    I do not know why your idea of the pivotal drive has not been taken further by the public after all these years, example when a teenager, a group of us would water ski and noticed some direct drive boats that had to be careful not damage the shaft and propeller.
    They had large V8 in small boats that turned the key off when wanted the boat to stop moving forward that almost hit the concrete boat ramp with prop and needed deep water to place boat on trailer.
    Your design pivotal drive would have solved this problem as the prop would not hit ground and he still could have direct drive and rest boat on beach.
    The pivotal drive is suited for the next Myark folding trailer pontoon, also last time in China I designed and manufactured a self-maintainable torsion suspension, axles and hubs all made from gr5 titanium, next is the pivotal drive system that may be manufactured from titanium which is redirected into the vehicles HP.
    The steering is embedded into the front pontoon is most suited because its not going to plane with car on top and is controlled from the vehicle steering.
    Using a removable titanium suspension and a titanium pivotal drive, this is still cost viable because of the saving by using the pivotal drive sytem as well as the folding Myark pontoon that is self-trailer and the saving of not having a separate trailer.
    Pictured is a proto type rubber self-maintenance titanium torsion suspension.
     

    Attached Files:


  15. whitepointer23

    whitepointer23 Previous Member

    Do you honestly still believe you invented that suspension.
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.