Re: Spark Length was Re: Voltage determination

["Barton B. Anderson" <tesla123-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Thanks indicating this John, it clears up all questions. 

Bart 

Tesla list wrote: 
>
> Original poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net> 
>
> Bart - 
>
> I am talking about the JHCTES Ver 3.1 program. If you change only the 
> secondary turns input the spark length will increase. The computer makes all 
> of the other changes necessary to keep the system in tune. You do not have 
> to make any other changes in the inputs to increase the output spark length. 
> I agree that more than Ls changes in the system. 
>
> Note that all of the variables in the posted equation are factors and not 
> the usual parameter values. 
>
> John Couture 
>
> ------------------------- 
> -----Original Message----- 
> From: Tesla list [<mailto:tesla-at-pupman-dot-com>mailto:tesla-at-pupman-dot-com] 
> Sent: Wednesday, July 26, 2000 11:37 AM 
> To: tesla-at-pupman-dot-com 
> Subject: Spark Length was Re: Voltage determination 
>
> Original poster: "Barton B. Anderson" <tesla123-at-pacbell-dot-net> 
>
> Hi Malcom, John C., David, 
> <a few bandwidth snips> 
>
> Tesla list wrote: 
> > 
> > Original poster: "Malcolm Watts" <M.J.Watts-at-massey.ac.nz> 
> > 
> > In order to increase Ls you *have* to change something else if 
> > tune is to be maintained, whether it is decreasing Cs 
> > (physically smaller coil, hence smaller wire, hence higher 
> > secondary losses), increasing Cp (in which case you'd have to 
> > lower Vp in order to retain an identical Ep = same Vout) or 
> > increasing Lp (in which case the impedance ratio is the same = 
> > same Vout). I think it is unrealistic to simply attribute 
> > increased sparklength to a change in one variable only when in 
> > reality others change or must be changed as well. The 
> > foregoing arguments assume negligible losses in the primary 
> > which isn't true either and then of course any modification to 
> > either coil affects k. Not so simple I would say. 
> > 
> > Regards, 
> > malcolm 
> > 
>
> Now this I agree with. It's not as simple as changing Ls, but the equation 
> posted would suggest otherwise (Spark length = W*Vp*Ls*B). 
>
> John, are you saying Ls alone will increase spark length? I'm guessing your 
> not 
> meaning to and maybe "only" in a case where Ls was originally not optimal 
> for 
> the coil to begin with. But even then, there must be a point where further 
> increase of Ls moves away from optimal (regardless of everything else that 
> changes), which suggest that Ls in the equation can't be used in the 
> mathematical way expressed. 
>
> BTW, optimal Ls (IMHO) is governed by the primary tank design. In other 
> words, 
> I might be so brave as to suggest that part of the reason H/D becomes a 
> factor 
> is biased towards a high loss or low loss primary tank circuit. 
>
> Take care, 
>
> Bart