The physics involved here, at least according to Nikola Tesla, are
different from the physics of radio transmission. I'm not defending world
wide power transmission with Greg's design, but I am defending Tesla's
understanding by saying that electric field transmission involves
longitudinal radiation in the electric field, as opposed to transverse
radiation in the electromagnetic field. The inverse square law does not
apply when resonance develops mainly in the electric field. This was a key
concept that Tesla designed his wireless transmission coils around, and
Tesla went to great lengths to make this concept clear.
Keep in mind that Tesla was physically transmitting power wirelessly at
Colorado Springs to the distance of miles, and not just tens of feet. But
that is not what this experiment is about.
This coil, as well built as it appears, is still not up to specs for long
distance wireless transmission, and yet, Greg has succeeded in building an
effective receiver for the bike motor. Like others, I hope he will share
details, but we cannot ignore the possibility that there may be patentable
information in his design, which he may want to hold to himself for now.
Unlike the usual hobbyist Tesla Coil that is purposefully detuned to
produce streamers, a proper wireless power transmitter must be perfectly
tuned for pure resonance so that there are no streamers; where most of the
energy is stored in the environment, and where over time, the environmental
stored energy will build up. This does appear to be the case with Greg's
design, as he didn't have instantaneous acceleration as soon as the
transmitter was turned on. It seemed like a gradual power buildup. It may
be that the metal building assisted in keeping the environmental power
buildup local.
If the transmitting coil is properly tuned, there will be no output
streamers at all, but there may be a glowing discharge around the top load.
I have somewhat succeeded at producing such a discharge in one of my
coils, although it was more like a full-space-purple-spray than a glow.
When I performed that particular experiment, it was within a room covered
with aluminum coated space blankets, and the discharge on the top load then
also had a gradual buildup.
In any case, Greg has inspired me to look again at my old coils to see if I
can replicate his work at least in principle.
David Thomson
On Sun, Aug 2, 2020 at 9:45 AM Steve White <steve.white1@xxxxxxxxx> wrote:
> Lets not get crazy here. Its been known for a long time that the power
> attenuates according to 1/(R**2) for far-field reception and 1/(R**3) for
> near-field reception and I believe that this video confirms that. I love a
> good demo as much as anyone even when it demonstrates no real practical
> value. To his credit Greg hasn't promoted this demo as anything more than a
> lab curiosity that is only practical for very short ranges (10s of feet).
> Its still very inefficient with kilowatts transmitted and tens of watts
> received even over these very short range lab demos, at least according to
> my eyeball analysis. He isn't saying that this can be applied to wide-area
> long range wireless power ala Tesla's 120-year old scheme, at least I hope
> not. That is my only problem with these short-range wireless power demos.
> Many viewers who are perhaps not trained in electrical engineering concepts
> will extrapolate this immediately to Tesla's world-wide wireless power and
> the conspiracy theories ge
> t started up all over again.
>
> Steve White
> Cedar Rapids, Iowa
>
> ----- Original Message -----
> From: "Liberty Rising" <garretsontech@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Saturday, August 1, 2020 8:20:25 PM
> Subject: Re: [TCML] More fun with wireless power
>
> I love it. Fantastic demonstration. But I hope that you are working to
> determine, refine and publish the overall efficiency of such an
> application. I like to show off to my friends the fact that my TC can
> brightly illuminate a 48" fluorescent tube at 10' from the source. But in
> order to do that I am pulling 12 amps at 140 volts for the primary input.
> Its an incredible waste of energy to say the least. That being said, I am
> merely a hobbyist. I have zero formal training on the matter other than
> having a HAM license. I would really like to see the numbers regarding
> power output from the transmitting coil compared to the actual work being
> done in HP or some other quantifiable measurement by the receiving device.
>
> My two cents
>
> - Brandon Garretson
>
> On Sat, Aug 1, 2020 at 8:56 PM jimlux <jimlux@xxxxxxxxxxxxx> wrote:
>
> > On 8/1/20 3:36 PM, David Thomson wrote:
> > > Is there any doubt that if someone had attempted to discuss this
> project
> > on
> > > this list before building the working model that they would have been
> > > moderated into silence?
> >
> >
> > Not at all - this would be a perfectly appropriate topic - where it
> > would get the side-eye from the moderators if you started to talk about
> > "powering the entire country" kinds of things.
> >
> > If you want to discuss power transmission using tesla coils in a
> > physics/engineering practical sense - how much power into your
> > transmitter, what voltages are practical, how would you build a
> > receiver, and those sorts of questions, I don't have a problem with it.
> >
> >
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