wiggle drive propulsion application

Discussion in 'Propulsion' started by SudorracMechEng, May 7, 2012.

  1. Frosty

    Frosty Previous Member


    I have never posted an opinion , I do not have any facts or problems or theories. I am a mechanical engineer not a theoretical engineer. I have not expressed any opinion about a fin V propeller except to say that it would have been interesting if a propeller was in existence that had also been subject to evolution.

    I have no interest in fins for toy boats or boats you pedal.

    I
     
  2. swashdrive
    Joined: May 2012
    Posts: 57
    Likes: 1, Points: 0, Legacy Rep: 24
    Location: SEQ, Aus.

    swashdrive Junior Member

    Frosty
    Its not a toy boat, it a prototype....thought u said u were a mech engineer
    If you have no interest in fins etc why do you persist in the badgering us old man !
     
  3. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    Who says it has to be metal ? Why not composites ?
     
  4. Frosty

    Frosty Previous Member

    Prototype --OH ha ha im not badgering any one but its annoying when people say I say stuff I did not.

    It is important to understand that if you want to repeat what some one says it should be quoted by clicking the quote button.

    Just re typing rubbish saying they said this is out of order.

    Yes I designed and built my own twin surface drives for 500Hp

    its all documeted here on the forum, ridicule at your leisure.

    But no I don't play with fins.
     
  5. Boston

    Boston Previous Member

    I guess the fin could be just about anything Mr but from a cheap bastads point of view aluminum would be ideal. Particularly if it was something I could just dice out of sheet stock. Which is why I was asking about the section.

    If I wasn't aiming for planing speeds, then my fin, depending on size would be going a lot slower. Lets just say a 5' long fin with some as of yet undetermined thickness and width. The cat's target weight is about 6k so I'd start from there and try and figure out how fast the fins at 5' and x surface area would have to move to get me to say 15 knots. I'm thinkin something like 100 hp total.

    I just think it would be fun to hash out the basics and see if fins would even remotely work for my purposes. My theory is that a flat single 5' home brewed fin is much much cheaper than a 22" three blade prop. If the section is simple enough, I could probably stash a life time supply of fins for the cost of one prop, and I need two. Just looking to save a buck if at all possible.

    sure composites would work, but are they necessary and whats my bang for the buck.
     
  6. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    If the thing is better to flex, ( I haven't noticed any rigid fish-tails) then composites seem the right choice, built right should be able to flex through millions of cycles without fatigue problems.
     
  7. kjell
    Joined: Aug 2005
    Posts: 271
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    Location: mallorca

    kjell Senior Member

    Hi Craig.
    Firs of all. I like very much your SPLASHDRIVE. Don’t worry I will not copy your invent. I understand that you don’t like to show how it is working. Maybe you are dreaming on to bee rich, patenting it. If you think your invent will be put in mass production, Patent it, if there are something mechanical that still can be patented.
    I don’t think so.
    Axial ball bearings is used to reduce friction. If your SplashDrive works as I show on my picture there are too much friction between the plates.
    Regards
    Kjell
     

    Attached Files:

  8. Boston

    Boston Previous Member

    I don't think a flat swashplate would give you the varying angle of attack, a serpentine plate rather than a flat one though, could.
     
  9. Mr Efficiency
    Joined: Oct 2010
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    Location: Australia

    Mr Efficiency Senior Member

    How to explain the absence of these devices in mainstream use ? It is surely not because the market is not there for something that actually represents an improvement on conventional propulsion.
     
  10. Boston

    Boston Previous Member

    I remember my first cell phone, it was called the brick phone because it was about the size and shape of a brick. Its actually sitting right here on my desk as an antique. Thing is it takes a little while for some technologies to really take off. They had brief case phones for twenty years at least before the hand held sets.

    If the fin drive is more efficient and cheaper for the fins than a prop, then it might eventually catch on. Add to that the feature of being able to swing up in shallow water and still provide propulsion and it just seems perfect for something like a cat where the fins could swing up under the bridge deck. On a mono they'd have to go outward, not so great particularly if your planing on pulling into a dock.

    If you could get away with aluminum fins, and the section wasn't to radical, you could pretty much file one out right there on deck if you had to.

    cheers
    B
     
  11. kjell
    Joined: Aug 2005
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    Location: mallorca

    kjell Senior Member

    Is this maybee what you need.
     

    Attached Files:

  12. Boston

    Boston Previous Member

    Not even, what I mean by swing up is for it to remain in the water but pivot on the center line of the boat up and under the bridge deck of a cat. Both sides towards one another.
     
  13. swashdrive
    Joined: May 2012
    Posts: 57
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    Location: SEQ, Aus.

    swashdrive Junior Member

    Oh ok splashdrive, don't think that was a typo LOL
    at least you can see from the video my prototype is on the plane and got pretty good traction, so yeah i thinks its totally unique....please show us anything doing the same or better using fins and i'll show you everything !
    Maybe ur pic shown is a very crude swashplate, i don't think you really know what a swashplate is or what you call a wiggle plate ? but anyway please tell us more about ur KJELL EFFECT, this may make my splashdrive go even better ?
    It has a Patent but i'm a lil" Jaded on this Whole IP thing, Swashdrive™ is a trade mark, that name is smeared through alibaba & ebay with all of the chinese piracy and theres no stopping it, hence my dilemma !
     
  14. Boston

    Boston Previous Member

    a patent is nothing but a legal tool, it guarantees nothing.

    Believe me I know.

    another reason I recently got into it over ethics violations.
     

  15. spork

    spork Previous Member

    Apparently you know as much about patents as you know about ethics.
     
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