RE: John's formula, spark length

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

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


All -

The sqrt of the input power to determine the spark length is  well
established. To find the spark length the JHCTES computer program takes this
a step further by including two more parameters that also affect the spark,
TC input voltage from the power transformer and secondary inductance. These
parameters are important because they can sometimes negate the effects of
increasing the input power when using a program. Of course this is only
approximate because it is based on empirical data.

John Couture

------------------------------


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, September 03, 2002 11:14 AM
To: tesla-at-pupman-dot-com
Subject: Re: John's formula, spark length


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

In a message dated 8/29/02 12:51:05 PM Pacific Daylight Time,
tesla-at-pupman-dot-com
writes:


>
> Hi,
>
> John's formula is at the bottom of this page:
>
> http://hometown.aol-dot-com/futuret/page5.html
>
> It is:
>
> Ques: How long will my sparks be for a given input power?
>
> Ans: In a well designed TC, the spark length will follow the formula:
>
> spark length (inches) = 1.7*sqrt input power (wallplug watts)
>
> Cheers,
>
>         Terry




Haven't looked at John's page for a while.  Does the formula somehow take
into
consideration the size of the coil?  My 6.0" diameter coil which I run at
about
6kva should produce about 132" sparks according to the formula.  The best I
have achieved is 104".  I do believe that a 10" or 12" diameter coil with
this
much power input could certainly produce 132" sparks.  For a given size
coil,
there is a maximum level of power that can be input to the system.  By just
using the formula, one could expect 132" sparks with 6,000 watts input to a
3.0" diameter secondary - which I don't think is feasible.

Sometimes I think I am on the verge of destroying my secondary at 6 kva.

Ed Sonderman