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4hv.org :: Forums :: General Chatting
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What do you guys think of this video? Some guys attract lightning to a wire.

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ScottH
Mon May 15 2017, 03:33PM
ScottH Registered Member #61373 Joined: Sat Dec 17 2016, 01:45PM
Location: San Antonio, TX
Posts: 87
They use the anode of a flyback to charge the wire attached to a kite. Here is the video Link2

Was this an actual lightning discharge, or some other phenomenon?
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Proud Mary
Mon May 15 2017, 07:25PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Everyone knows Benjamin Franklin's famous experiment in 1752 where he flew a kite into a thunderstorm, and drew sparks from a key hooked up to a Leyden Jar (a capacitor) tied at his end of a silk kite line.

Several people who have tried to copy the great man's experiment have been electrocuted.
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ScottH
Tue May 16 2017, 07:48AM
ScottH Registered Member #61373 Joined: Sat Dec 17 2016, 01:45PM
Location: San Antonio, TX
Posts: 87
The bottle was not a Leyden jar, but a makeshift spool for the wire. How does the relatively small voltage (10s kv+ and milliamps) of a flyback trigger a 100mv lightning bolt from the storm?

Do you think the flyback hooked up to the wire had any effect on attracting the bolt?
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dexter
Tue May 16 2017, 08:38AM
dexter Registered Member #42796 Joined: Mon Jan 13 2014, 06:34PM
Location:
Posts: 195

active lightning rod
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Proud Mary
Tue May 16 2017, 04:59PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
ScottH wrote ...

The bottle was not a Leyden jar, but a makeshift spool for the wire. How does the relatively small voltage (10s kv+ and milliamps) of a flyback trigger a 100mv lightning bolt from the storm?

Do you think the flyback hooked up to the wire had any effect on attracting the bolt?


I don't know, Scott - if the video is genuine, perhaps the flyback voltage had the effect of pre-ionisation around the wire, as used in some triggered spark gaps.
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Conundrum
Mon Jun 05 2017, 06:05AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Probably coincidence, a simple kite in a storm will eventually get hit.
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Proud Mary
Mon Jun 05 2017, 08:16PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
The television does in fact contain a high voltage capacitor very similar indeed to a Leyden Jar. The mu-metal shielding plated onto the glass is designed to function as a capacitor, and is used as such in the HV voltage multipliers in many television designs of that vintage.
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Conundrum
Thu Jul 13 2017, 05:49AM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
I did wonder if a TV tube could be repurposed as HV storage. Turns out that it can, but the ESR makes it almost useless. A typical CRT can take around 3* its normal EHT voltage but this risks it imploding.
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radiotech
Sat Jul 22 2017, 08:28AM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
I would suggest that if you hooked up a kite tethered by a wire strong enough not to break
the coronal loading up the wire would not be supported by the small flyback which also sweeps
the beam and lights up the tube face. Yet the TV on the you tube was working.

Having said that, I have flown the hydrogen balloons on the end of the aerial lead on a Gibson Girl
transmitter, It works just dandy.


I also have written up insurance report for a big TV destroyed by a lightning hit
on the aerial.


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