Re: WinTesla Equations Version 5.5

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

Original poster: "Lee Hennes by way of Terry Fritz <twftesla-at-qwest-dot-net>" <leehennes-at-cox-dot-net>

Hi all... 

OOOPS! I gave you a formula for breakdown voltage in dry air at sea level. The
formula was fine but I had a brain fart on the units. The formula again is: 

v = 2440 d + 61 d^2 

v:  kilovolts 
d:   gap in meters  (NOT inches as I previously said!) 

converting the formula to inches gives us: 

v = 61.9760 d + 1.5494 d^2 

Therefore using this formula it would take 63.6 kv for the 1 inch gap. A gap
supplied by a standard 15kv NST  breaks down at a 0.25" gap which is
reasonable.  The reference is: High Voltage Engineering by M. Khalia, Marcel
Dekker, Inc., 1990. Sorry for my math blunder. I am sure some of you were
scratching your head when you tried to use the previous formula.... 

Lee 

Tesla list wrote: 
>
> Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <resonance-at-jvlnet-dot-com> 
>
> The 8.7 kV/in was a measurement for sec. coil discharges, not in the primary 
> circuit. 
> This value was measured with a coil running at 7.5 kva. 
>
> Dr. Resonance 
>
> ----- Original Message ----- 
> From: "Tesla list" <tesla-at-pupman-dot-com> 
> To: <tesla-at-pupman-dot-com> 
> Sent: Friday, October 25, 2002 10:30 AM 
> Subject: RE: WinTesla Equations Version 5.5 
>
> > Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
> <Gary.Lau-at-hp-dot-com> 
> > 
> > I would suggest that WinTesla make no attempt to calculate static gap 
> > spacings.  This is something that must be determined experimentally, since 
> > everyone's electrode geometry (and altitude!) will be different.  While a 
> > ballpark figure would be useful, I fear that nubies seeing a figure 
> > generated by a widely used computer program would take that as Gospel and 
> > make no further attempt to set the gap experimentally. 
> > 
> > But even as a ballpark, do you really believe that a 6kV NST (8.4kV peak) 
> > will jump a 1 inch gap?  Certainly not at sea level! 
> > 
> > Regards, Gary Lau 
> > MA, USA 
> > 
> > 
> > >Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
> > <Rscopper-at-aol-dot-com> 
> > > 
> > >Looks to me like no one really knows what the correct equation should be. 
> If 
> > >we all decide on one I'll put it in WinTesla Version 5.5.  There's quite 
> a bit 
> > >of work to do on the rotary spark gap section anyway.  8400V/in was good 
> > at the 
> > >time I wrote Version 3.2 over 2.5 years ago. 
> > > 
> > >R. Scott Coppersmith 
> > 
> > 
> >