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Simple Rules for Producing Longest Sparks Using Minimum Power Input


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From:  Richard Hull [SMTP:rhull-at-richmond.infi-dot-net]
Sent:  Saturday, August 15, 1998 11:35 AM
To:  Tesla List
Subject:  Re: Simple Rules for Producing Longest Sparks Using Minimum Power Input



Tesla List wrote:

> ----------
> From:  FutureT-at-aol-dot-com [SMTP:FutureT-at-aol-dot-com]
> Sent:  Thursday, August 13, 1998 5:49 PM
> To:  tesla-at-pupman-dot-com
> Subject:  Simple Rules for Producing Longest Sparks Using Minimum Power Input
>
>  All,
>
>  These rules may be helpful for some who may wish to experiment
>  with sync-gaps at low break rates.  In a recent posting, I showed the
>  better efficiency I obtained using these methods.  It is important to
>  have a well matched system when using sync-gaps.  These rules are
>  based on my 42" and 64" spark TC's.  It should be possible to scale
>  the results up or down, by following these rules.  These rules are just
>  a rough guide, and some slight non-linearities may be seen with up or
>  down scaling.  Results will be affected by transformer losses, design
>  techniques, etc.  These rules are based upon a square law for power
>  versus spark-length scaling, which seems to fit well with empirical
>  results.
>
>  1.  Select desired spark length in inches.
>  2.  Divide by 2.5, this gives the desired toroid dia.  (approx)
>  3.  Divide the desired spark length by 10, this gives the desired toroid
>       thickness.  (approx)
>  4.  Power input (watts) = (spark length/1.7)^2   (approx)
>  5.  (Watts/120BPS)/1.5 = Joules/bang   (the 1.5 factor covers losses)
>  6.  Minimum rating for transformer = power input (watts) from (4) above,
>       for non-shunted transformer.  (approx)
>  7.  Voltage on capacitor, Vc = input voltage times 2.22 times transformer
>       nameplate rms voltage rating, for resonant charging with some losses
>       thrown in.    (approx)
>  9.  Capacitor size;  C = 2 J/Vc^2  (joules from (5) above) (approx)
>  10.  Spark gap;  synchronous rotary, 120BPS.
>  11.  Primary and secondary coils;  use traditional designs.
>  12.  Inductive ballast; adjustable as needed.
>

snip

>  John Freau
>

John,

This is a very well done and well thought out list and should serve a a good
guide to folks seeking general ideas and specs for larger systems.  I like it
very much and it mimes much of what I find works well.

Richard Hull, TCBOR