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Re: [] RE: Tesla coil on Ebay; 80-300' lightning?

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Anthony,
The coupling is just like any other configuration. It is based on the mutual inductance between coils as based on their individual inductance and proximity to one another. One can certainly build an internal primary. But, in order to mechanically make it a viable option, the secondary would need to be pretty large for winding purposes, placement and fastening techniques, etc.. Thus, most primary windings are external. Greg's extreme Electrum coil did incorporate an internal primary. To figure out the coupling, simply use Javatc. It can do internal primary's as easily as external. Just feed it the data. 

http://www.classictesla.com/java/javatc.html

Also, Antonio's programs may also be able to do this type of modeling.

Take care,
Bart

Tesla list wrote:


Original poster: "Anthony R. Mollner" <penny831@xxxxxxxxxxxxx>

I want to know more about using an internal primary. It seems like it would
be over coupled but, I have no idea really. How is the coupling figured out
with an internal primary?

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Tuesday, April 10, 2007 6:33 PM
To: tesla@xxxxxxxxxx
Subject: [PHISH] RE: Tesla coil on Ebay; 80-300' lightning?


Original poster: "Hans Schattenmeister" <klugmann@xxxxxxxxxxx>

Operating at 6 kW (220 X 30 Amps) you would be luck to get 80"
discharges. I remember a guy who was running a 38 kW coil and getting
55' - 105' arcs. The coil was 5' in diameter, had an internal primary
and stood about 25' tall.









>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Tesla coil on Ebay; 80-300' lightning?
>Date: Sun, 08 Apr 2007 18:56:27 -0600
>
>Original poster: "M G" <gt4awd@xxxxxxxxx>
>
>Sometimes I check ebay "Tesla coil" to see if there is anything new
>that I would like to get. While searching I run into an auction
>where a coil is being sold for just about $15,000. The description
>says that it can create verticle streamers 80-300' straight up in
>the air. Looking at the coil you can see the primary does not have
>that many turns, and considering the secondary is so large, the
>capacitor must be huge. I have my doubts that this coil can create
>streamers that long using only 220volts at 30amps. It also seems
>that this coil is being sold to anyone willing to pay the high
>price, regardless of electrical knowledge, which is a bad idea in my
>opinion. Here is a quote of the entire description.
>
>http://cgi.ebay.com/Giant-Megavolt-Tesla-Coil-for-Special-effects-HUGE_W0QQ
itemZ220099893593QQihZ012QQcategoryZ4665QQrdZ1QQcmdZViewItem
>
>"Do not turn on near airports or other sensitive installations.
>Generates Giant Lightning bolts from 80 to 300 feet tall going
>straight up. Uses 220 volts single phase at 30 amps. Noise will wake
>the dead. Might bring them back to life to, dont know for sure but
>dont try it to be sure.. I will not help you re-bury anyone you
>re-animate. This is not a toy. Buyer will be responsible for pickup
>and transportation. This was custom made for my boss by the same guy
>who builds them for Hollywood Special effects people in the 80's.
>Built into Mahogony wood furniture, control will support remote
>activation ( while under cover ). Comes with various books, papers,
>letters and a hard back rare collectable Tesla book too. This is not
>somthing you will see again in your lifetime. No its not UL
>approved. Resulting display can give goosebumps, make women flee and
>children to become incontinent. Use proper discretion when
>activating, recomend out someplace away from everything important.!
>Does set off EMP detectors at the Feds Nuclear Monitoring stations,
>it looks like a 10-15 ton nuke going off on the detector. Have fun."
>
>----------
>Create and Share your own Video Clip Playlist in minutes at Lycos
>MIX (<http://mix.lycos.com/?if_Event=MAILmixtagline>http://mix.lycos.com)
>

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