Re: KVA Model 9J

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Tesla729-at-cs-dot-com>

In a message dated 10/6/01 2:45:09 PM Central Daylight Time, tesla-at-pupman-dot-com
writes: 

snipperzz.... 

>
> Jeff's Model 9J was inspired by Wysock's Model 9.  The coils are about the 
> same size but they are NOT carbon copies of each other.  I'm guessing that 
> Jeff's 9J was built about 12-15 years after Bill did his original Model 9 
> research.  Note that Bills coils have no letters on the model numbers 
> (except Bill's maggies which have an "M").  Jeff's coils always have a "J". 
>
> Go to Jeff's site and click on equipment. 
> Here is a summary of "designed by Jeff" coils. 
>
> ----- 
> 10J 
> 25 ft, 240V, 100A, therefore 24KVA or 1.04 ft/KVA 
>
> 9J 
> 16 ft, 240V, 75A, therefore 18KVA or 0.88 ft/KVA 
>
> 8J 
> 12 ft, 240V, 50A, therefore 12KVA or 1.00 ft/KVA 
> ----- 
>
> I'm betting that Jeff's numbers are "reliable" arc lengths and not the 
> occasional long streamer that all coilers sometimes measure on a cold night 
> with no wind, a full moon, and after torturing the Edison voodoo doll.  Keep 
> in mind the numbers on his page are used to size power requirements so it 
> only makes sense to publish medium arc length values and high power demand 
> values. 
>
> A 9 ft arc with 6KVA in (1.5 ft/KVA) is really good! 
>
> Most people never get the Freau empiracle equation of 1.7*sqrt(VA). 
> You are getting very close (9ft vs 10.9 ft).  Congratulations. 
>
> Best Regards, 
> Ross Overstreet 
> Austin, TX 
>



Justin, Ross, all, 

I have to concur with Ross on this issue, too. My "Medusa" 
coil system produces consistant 8 to 10 footers from 240 
volts at about 35 to 40 amps input, so I'm a little ways shy 
of Freau's efficiency formula, too. Of course I am running 
asynch and STR (smaller than resonant) with a ballasted 
10 kVA, 14.4 kV pole pig, so that probably has something 
to do with a little less apparent efficiency, as far as spark 
length vs. input power goes :-) 

<The numbers that you quote are found on Bill Wysock's Model 9 page. 
<See http://www.ttr-dot-com/model9_page2.htm. 
<You'll have to redirect this question to Bill.  I'm *guessing* the 5KVA 
<refers to a 5KVA pig that is being severely abused :-) 

That would be my guess, too. Remember, you can pull several 
times the nameplate rating of kVAs from a pole pig for relative- 
ly short runs. 

Sparkin' in Memphis, 
David Rieben