Re: Sparklength inquiry

```Greg, John -
My appologies. I did screw up the equation when I first
posted as I did with the Vs equations. Must of been a
bad typing night. John, I usually represent your
equation in my spreadsheets as sparklength =
(Vs*1000/65)^1.43 = (KVs/65)^1.43. I apparently hit the

As you stated, this is purely emperical and probably the
best out there I know of. You also stated it can be
related to breaks and power, however, I'm getting some
wild numbers way out there using both equations. I
assume there's a step or two missing to calculate
sparklength?

Bart

Tesla List wrote:
>
> Original Poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
>
>   Bart, Greg -
>
>   I agree the equation (Vs/1000/65)^1.43 is not correct. It should be
> (Vs/65000)^1.43 where Vs is the secondary volts or
> (KVs/65)^1.43 where KVs is the secondary kilovolts.
>
>   This equation is an empirical equation based on real coil test data from
> many coilers. The reason for the non-linear 1.43 power is because the spark
> length is dependent on both voltage and the ionization of the air path from
> the previous spark. Some day it may be possible to equate the ionization in
> a more accurate manner.
>
>   To my knowledge this is the best equation presently available for TC
> spark length. It will probably change when more accurate data from coilers
> becomes available. It appears to be working well at present. It can be
> related to breaks and power by
>
>   Watts = .5 Cs Vs^2 BPS  or  Vs = sqrt(2 watts/(CS BPS))
>
>   Hopefully coilers like you will develop a better equation.
>
>   Tesla coils are like women, they are more fun to play with than to try
> and understand.
>
>   John Couture

```