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Discussion in 'Volkswagen' started by wanttobuild, Aug 11, 2018.

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  1. Aug 17, 2018 #41

    pictsidhe

    pictsidhe

    pictsidhe

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    Quite a few car propshafts now have rubber couplings that may be useful. Lovejoys aren't rated for many RPM.
     
  2. Aug 17, 2018 #42

    TFF

    TFF

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    I have owned eight Alfa Romeos, and I have several hundred thousand miles driving them. I love my Alfas. I would not put one of their rubber doughnuts on a plane.
     
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  3. Aug 17, 2018 #43

    Vigilant1

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    "Giubo" doughnut. Sorry! :)
     
  4. Aug 17, 2018 #44

    Turd Ferguson

    Turd Ferguson

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    My '60's (?) Graziano Italian lathe has an electromagnetic coupling in the drive line. It's pretty cool in that the motor only turns in one direction but the spindle can turn forward or reverse and change direction of rotation instantly if desired. Smooth as silk, no gear grinding or metal clunking.
     
  5. Sep 30, 2018 #45

    pictsidhe

    pictsidhe

    pictsidhe

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    NOBODY has yet managed to redrive a half-VW. Several have tried. Assuming that you can just fit one engineered for a different engine may be a trifle rash. Feel free to try it, though. I'd recommend plenty of ground testing.
     
  6. Oct 1, 2018 #46

    proppastie

    proppastie

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    Having owned many bikes and even one Harley. Neither the VW or Harley name impresses me.
     
  7. Oct 1, 2018 #47

    pictsidhe

    pictsidhe

    pictsidhe

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    I've heard that harleys are a lot better than they used to be. The Japs were killing their sales so they updated. I wasn't too smitten with the innards of an 80s one.
     
  8. Oct 1, 2018 #48

    lr27

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    I have seen ideas for magnetic reduction drives! At one point, I even sorta understood how they were supposed to work. Allegedly used, of all places, in oil drilling rigs to speed up and reduce the size of the tube driving the drilling head. I suspect that the electro-magnetic coupling works by eddy currents. If you have a rare earth magnet, try sliding it down a steeply inclined, conductive but non magnetic ramp like a large aluminum pan. Or try sliding it down a steeply slanted copper pipe. It's amazing how slowly they can go. For comparison, try sliding the same magned down a plastic tray or something. So I think if you put an aluminum disc on one side and a bunch of magnets almost touching the disc, arranged in a symmetrical fashion on the other side, you could have a reasonably non-slip coupling with lots of damping. Depending on how much it slipped, the aluminum disc would have to dissipate more or less heat.

    It's not as necessary. If you're maintaining the same horsepower to disc area ratio, the diameter of the prop for the half VW will be 29 percent smaller, meaning 29 percent slower tip speed at the same rpm.

    Well, there are always the imitation Harley's. Doesn't Honda have one?
     
  9. Oct 1, 2018 #49

    pictsidhe

    pictsidhe

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    I think all the japs have harley-esque models.
    Personally, I think that aero engines are best with OHV heads. They don't rev high so anything else is just extra weight. That means Harley is a top choice as the Japs have gone OHC.
    I did wonder about a 90 degree harley case, but the crank sucks for hanging a prop off, so you'd need a new one of those too by which time it was getting a lot of machining.
     

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