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  1. Closed: Re: Magnetic flux conduit for flux concentration?

    Patience? What's that? Never heard of it!

    In some sense we are both right. The eddy currents that you sketched will certainly exist, but I claim they are not relevant to the operation of the...
  2. Closed: Re: Magnetic flux conduit for flux concentration?

    The silence is deafening. This is a really odd forum. There are hundreds, or thousands, of people that read these postings, and yet almost no one writes anything. I am asked to provide a sketch of...
  3. Closed: Re: Magnetic flux conduit for flux concentration?

    Yes, agreed that there must be eddy currents at the inner metal surface. But broadly speaking, not at the outer metal surface.

    The shape of the current loops is IMO easier to describe verbally...
  4. Closed: Re: Magnetic flux conduit for flux concentration?

    We agree that eddy currents of this type will in general definitely exist, though for many reasons I don't believe that they are a significant player in making the split tube act as a "flux conduit"....
  5. Closed: Re: Magnetic flux conduit for flux concentration?

    But before I can do the modelling, you need to tell us how the magnitude of the eddy currents that you have sketched varies along the length of the conduit.

    If we assume that the magnitude of...
  6. Closed: Re: Magnetic flux conduit for flux concentration?

    Agreed that the field will not penetrate beyond the skin depth, which is small for high conductivity and frequency. AFAIK we all agreed on that from the outset, and in a hand waving way, we can use...
  7. Closed: Re: Magnetic flux conduit for flux concentration?

    OK. Now I understand. Sorry about that.

    Yes, I agree that such eddy currents most certainly will exist. But they will exist whether or not the field along the tube is diverging, and their...
  8. Closed: Re: Magnetic flux conduit for flux concentration?

    Interesting theory. As far as I know, the magnitude of the eddy currents simply decreases at greater depths, but the direction of the current loops remains the same. If what you say is true, then I...
  9. Closed: Re: Magnetic flux conduit

    Is no one else interested in what the shape of the eddy currents look like? Or is no one game to guess or estimate what they look like? Hard to know. Plenty of people looking at the thread, but no...
  10. Closed: Magnetic flux conduit

    [Threads merged] - This one adds significant information to the above thread, closed

    I stumbled on an earlier thread entitled "Magnetic flux conduit for flux concentration?"
    ...
  11. Closed: Re: Extracting energy from gyroscope precession

    Well at least someone agrees with me ..... :)
  12. Closed: Re: Extracting energy from gyroscope precession

    And the result, is that after the torso has leaned back and stays leaned back, the swing is swinging with an amplitude of about +- 15 mm. I repeated the experiment half a dozen times and the result...
  13. Closed: Re: Extracting energy from gyroscope precession

    I set up a small experiment simulating a rigid rod swing. A single 6mm dia brass rod, 500 mm long was suspended from a thin thread - that is the rigid swing rod. The human upper torso is a 150 mm...
  14. Closed: Re: Extracting energy from gyroscope precession

    I disagree. But it is hard to argue against such hand-waving statements that give no reasons or reasoning as to why the writer believes the statement to be true. Do you believe there is some...
  15. Closed: Re: Extracting energy from gyroscope precession

    Some excellent thoughts there, c-mitra. Your additional details are welcomed. Yes, when you lean back, then of course you need to "hold on" to the ropes. I was well aware of this, but did not mention...
  16. Closed: Re: Extracting energy from gyroscope precession

    OK. So in real world experimenting with my swing, I find that air drag is not relevant to starting and pumping up a swing, and that "weight shift" is the dominant mechanism. But that is a woefully...
  17. Closed: Re: Extracting energy from gyroscope precession

    As no one else seems keen to express an opinion (or present evidence) on this, then I'll stick my neck out and say that air drag is most certainly not necessary for starting or pumping up a swing or...
  18. Closed: Re: Extracting energy from gyroscope precession

    Hmmm. Well yes, it is certainly possible to exploit air drag to start (and even pump up) the swinging of a person hanging on a rope. As you say, with an open umbrella this effect could be made very...
  19. Closed: Re: Extracting energy from gyroscope precession

    Perhaps significantly, no one else supports your belief that friction is required to start a swing, plus you have already been wrong on other points, plus you give no reason for your belief, so you...
  20. Closed: Re: Extracting energy from gyroscope precession

    Thank you my friend. As I mentioned in my posting, I am quite familiar with the physics of spinning ballerinas. I have played with them often, or was that swings ... :)

    And I figured that someone...
  21. Closed: Re: Extracting energy from gyroscope precession

    I can think of two examples. The first example is well known so forgive me if you are familiar with it already. Can the rotational speed and rotational energy of a spinning object increase with no...
  22. Closed: Re: Extracting energy from gyroscope precession

    Your analysis of your thought experiment is correct. To describe slightly differently, if you hold the spinning wheel in 2 hands and rotate the axle in the horizontal plane, then without a doubt it...
  23. Closed: Re: Extracting energy from gyroscope precession

    All completely agreed, and not inconsistent with anything I have said previously. And yes, you can harvest energy from the tides, but only because an external mass (moon) is involved. When I said...
  24. Closed: Re: Extracting energy from gyroscope precession

    I have done to death the reasons why your particular scheme for harnessing energy from the earth's rotation cannot work. But by applying only the principle of conservation of angular momentum, we can...
  25. Closed: Re: Extracting energy from gyroscope precession

    I never make a claim that I can't back up. In my last posting, I claimed that when there is an equal and opposite reaction force or torque, as there always is, then the energy that is imparted to the...
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