Re: [TCML] Small coil results

["David Rieben" <drieben@xxxxxxxxxxx>]

Yep, I've gotta agree with Scott on this one, too. 5,000 BPS seems EXREME
for a
standard SG driven coil. At 10,000 RPM, it would require 30 flying
electrodes to
on the rotary disc to achieve sufficient presentations to accomplish 5,000
BPS!
This would NOT be a trivial ARSG to construct for reliable operation. Are
you
sure that you didn't mean 500 BPS, which would be a much more reasonable
BPS goal range for a typical ARSG driven coil system?

Also, I wouldn't think that even the most robust, high rep rate pulse caps
to
withstand very much of a 5,000 BPS abuse without suffering a premature
death.

David Rieben

PS- Scott, I think you probably meant to say a "conventional rotary spark
gap" instead
of a "conventional static spark gap", as a static SG will only fire a BPS
rate that is mar-
ginally faster than the mains line frequency, depending on the size of the
tank cap
vs. the power rating of the transformer. 5,000 BPS SURE wouldn't be
accomplished
on a STATIC spark gap with standard 50 or 60 hz line frequency!



----- Original Message ----- 
From: "Helen Lo" <quarkster@xxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Sunday, April 13, 2008 11:30 AM
Subject: Re: [TCML] Small coil results


> Ben -
>
>   Exactly how did you measure the 5,000 BPS break rate? What type of test
equipment was used?
>
>   It would seem almost impossible that a conventional static spark gap
could fire and clear quickly enough to support  5,000 BPS.
>
>   Regards,
>   Scott Hanson
>
> Ben Sneath <bsneath@xxxxxxxxxxxxxxxx> wrote:
>   hello all, you might find this interesting,
>
> Today i managed to get my small 1.75" coil working.
> At first, i was getting 3-4" while driving it with a flyback
> transformer/555/mosfet(IRF740) driver, then, not happy with
> that, i connected this tiny little coil with only 10n tank
> capacitance up to a twin mot stack. Thats where things got
> loud. It threw white hot streamers straight into the
> primary, a distance of about 10" or so (wasn't too worried
> about it because i was using a practically indestructable
> power supply and an indestructable tank cap).
> The funny thing is the breakrate it was running at - 1 BPS
> with flyback, FIVE THOUSAND BPS with the mot stack. Now it
> may be a terrible waste of power, pumping 2kva into a 1.75"
> coil, but, it finally made sparks.
> anyways here are the specs:
>
> Power:
> unrectified 4kv mot pair, 2Kva
>
> Gap:
> 5x 1/2" copper couplers
>
> Secondry:
> 1.75", 6" winding length 900ish turns
>
> Topload:
> 1.5x5 toroid (foil covered)
>
> Primary:
> 6" flat spiral, 6.4 turn
> 10.5n beer bottle/salt water cap
>
> Sparks:
> 10" loud streamers, 2 or 3 at a time
>
> ben
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