5 years ago
is this real?
5 years ago
Old thread, but if this did work, it would be like trying to walk on water wearing arm flotation devices on your feed, you'd fall over.
Also where do you live that you think you'd have just tons of metal to walk over?
7 years ago
this is NOT real the magnets would attract to the metal beam unless there was an opposing force of the same polarity don't spend your money on them
8 years ago
Even if this idea worked, it would be extremely hard to move on your own or take steps.
No, obviously a joke of sorts.L
not possible. notice how he only puts a positive terminal on each magnet, but not a negative. also, it would have to be an electromagnet for electricity to do anything. we put more weight on our heels. his toes point down when he floats. ur toes would point up, because of all the weight on ur heel. u would float, you would be push away and back on the ground, if it worked at all. notice how he only shows his lower half...
10 years ago
No :-) I think the poor guy hung himself when he discovered that his shoes didn't work.
10 years ago
haha i thought that he was just trying to make them look like they would work ,but i meant the theoretical use of magnets to make me float above a metal surface
I recomend using large fans for propulsion. Ever seen that Braniac episode where they make a hoverboard?
9 years ago
Lol yeah. Have you seen the one where they put blocks of cesium in a bath?
"Levitation" via magnetic repulsion is inherently unstable (the forces are such that a small deviation from perfect alignment is driven farther and farther away).
Maglev trains counteract this instability with mechanical barriers, and by setting up pairwise repulsions along multiple axes which are mutually constrained.
You can't use magnets to levitate against a ferromagnetic surface -- the external magnetic field necessarily induces a magnetization which is attractive (that's why magnets stick to iron plates :-). You can work this out yourself with a simple toy model. Treat the metal as a collection of randomly oriented little bar magnets. Bring a large magnet near it, and ask how the constituents will align themselves.
However an extremely powerful magnet could make you hover, or hover on water, think lifting frogs with supermagnets, I'm almost sure they use the diamagnetic properties of water...
The frog levitation is done inside a solenoid magnet (i.e., immersed within a dipole field. Hovering means you're using the exterior loops of a dipole (or more complicated multipole) field, which will be unstable.Also the question asked was about hovering above a metal surface. With a sufficiently strong field, you might be able to produce a bearing ("hover") against a diamagnetic surface, but with fields that strong, I wonder whether there would be subtle neurological effects (which frogs can't exactly tell us about :-).Now, if you kitted out your house with a floor tiled entirely in lanthanum cuprate ceramic (high-Tc superconductor) and replaced the radiant heat system with circulating liquid nitrogen....Hmmmm....
Though unstable a large field coming from a flat plate might be similar to standing on floats in a swimming pool, a human could potentially move along doing that by having a leg in front of them and another pointed out behind - obviously this doesn't work in swimming pools because there's no energy transfer... If you made yourself some powerful electromagnets and a rail system you could get a super low friction thing on the go like a maglev, however the energy involved would be huge I'd say, especially for something home engineered.
By the way watch your inbox, got a little project you may be interested in.
....I've been thinking about this some more...I don't think you could do the levitation at all with a static magnetic field (either permanent magnets or simple DC powered electromagnets). The instability is going to get you.However, you should be able to do something with an active feedback loop and electromagnets. I've got a toy on my desk, which uses electromagnets to suspend a ball with a permanent magnet in midair. As the ball falls (even a little), the changing B field induces a current, which is sensed to increase the actuator current. As the ball gets too close, the same effect is used to decrease the actuator current.I suspect you could do something similar, but more complex, to detect a deviation from balance and alter the levitation field to compensate. Whether such a system (with power supply, feedback circuit, and electromagets) could be built into a pair of shoes (snowshoes :-) is a separate question.
DIAmagnetic levitation - using bismuth or pyrolytic graphite IS statically stable, and doesn't violate Earnshaw's theorem.
Good point, Steve! It doesn't generally support much weight (yes, weight, for the non-physicist nit-pickers out there :-), however.
I don;t know if there are theoretical materials with higher diamagnetic effects ?
Well, superconductors hit the theoretical maximum of µ = 0 or xm = -1, compared to bismuth's xm = -1.16×10-4.
I don't know any obvious reason why you couldn't design a room temperature material (or metamaterial) with a susceptibility of -0.1 or -0.5, i.e., a large but non-superconducting value.
However, I'm not a condensed matter physicist, so there may be good theoretical or pragmatic reasons why not.
I thought of superconductors just after I posted, as I was imaging the flux patterns in the material !
I'd say the majority would have to go elsewhere, I suppose the tech's mostly there, I'd say looking over how a shuttle keeps adjustment for a certain angle would be interesting, the difference being the object itself is pushed, not pushing away...
9 years ago
i'm guessing 50 pound lifter magnets are expensive?
This is not possible and is a fake like everyone else says. When he is finish and supposently leviates only the heel goes way up not the front which shows he was hanging on something well that is what I believe.
This household hacker guy has been putting up complete crap for a while, he was the "Charge your ipod with an onion and gatorade" person. Worst thing is, people believe him so easily because they have little grasp of the underlying principles of what he's doing.
Hahaha!So FAKE!In the middle of the video I thought: "Ohh I get it, these are hoovering "SHOES", not like you're going to levitate with them on... like to display them on your room, well this might work..." But NO! they actually fulfilled the course on sillyness.Go put your xmas money on something else like a Macbook Wheel