Re: Determining Max Secondary Size

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

Original poster: "Jason Johnson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <hvjjohnson13-at-hotmail-dot-com>

Well there really is no maximum size that can be driven but there is a
maximum spark length that can be obtained from a given transformer. About
the maximum spark length you can expect from an efficient coil is:

Spark length in inches= 1.7 * Sqrt(input power in watts)

It may be possible to get more but it is unlikely from average construction
from an amatuer. If you have a secondary that is huge for its power supply
you may not get as good of results as you would with an average size
secondary, plus the bigger the secondary the smaller the sparks look in
comparison (it would look much more impressive to get 3 foot long sparks
from a 3"x18" secondary than it would to get the same sparks from a 10"x60"
secondary). It would be far better to figure the smallest secondary you
should have with a power supply, so you don't fry one that you put alot of
time into (probably no shorter than 1/3 to 1/2 the expected spark length,
keeping the height/diameter ratio between 2.5:1 and 7:1) You should check
out John Freau's web page for some really good efficiency stuff. Don't have
the link handy but I'm sure somebody does.

Jason Johnson
G-1 #1129

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, June 12, 2001 9:00 PM
Subject: Determining Max Secondary Size


> Original poster: "Stolz, Mark by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Mark.Stolz-at-st-systems-dot-com>
>
> Hi All!
>
> Hopefully this question gets some response, unlike my PFC question.  How
> does one figure out the largest secondary that can be driven with a given
> power supply?
>
> Mark Stolz
> Houston, TX
>
>
>
>