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Re: Sparklength inquiry
> Original Poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
> Power Input JohnF JHCTES
> 680 W 42" 15"
> 2100 W 64" 35"
> 8400 W 128" 97"
> 10 KW 15' 9.3'
> 26 KW 25' 18.3'
> 33.6 KW 21' 23'
> 67 KW 31' 38'
> 109 KW 45' 55'
> 134 KW 42' 64'
> 538 KW 84' 180'
>
> Note that both curves cross at about 33.6 KW with a 21 and 23 ft spark
> length. The streamer sparks are longer below this level and shorter above
> compared to the controlled sparks. The JHCTES data is from the computer
> program and the Fig 2 graph in the TC Design Manual. This graph is based on
> power levels to only 60 KW and has been extended to higher power levels
> without actual test confirmation.
Just curious, what were the specs on the 60kW coil?
> It should be noted that the square root curve flattens out and ends up
> with very little increase in spark length regardless of power input. This
> would make a lightning bolt a couple miles long almost impossible? The
> average lightning bolt has about 150 joules of energy.
150 Joules???!!! Perhaps an umbrella is all you need after all!
See Page 215, 'Lightning', by Uman.
The typical energy in a strike is approximately 100kJ/m.
Therefore a 2 mile strike would therefore dissipate about
_322 MILLION_ Joules.
I'm beginning to think that this thread is 'flame bait',
and so I will bow out at this point. The book is very
good reading, you should pick up a copy.
--
-GL
www.lod-dot-org