[TCML] Small coil results

[David Rieben]

Ok, I supppose I didn't read Ben's original posting closely enough.
I was making that proverbiable mistake of "assuming" that he must
be running with a RSG to even suggest a 5K BPS rate. Maybe
also when you mentioned "fire and clear quickly enough to support
5,000 BPS" made me think of MECHANICAL seperation to
"clear". I think we are definitely in agreement that that kind of
a BPS claim with a static gap, when the line frequency is 50 or
60 hz, SEEMS absurd, though. Anyone care to explain how this
could be?

David




----- Original Message ----- 
From: "Helen Lo" <quarkster at att.net>
To: "Tesla Coil Mailing List" <tesla at pupman.com>
Sent: Monday, April 14, 2008 4:58 PM
Subject: Re: [TCML] Small coil results


> David -
>
>  No mistake about the "conventional static spark gap". Per his 
> description,  Ben used 5 X 1/2" copper pipe sweat couplings to make a 
> 4-segment static gap (total gap width was not mentioned).
>
>  So, 5,000 BPS with an RSG would have been at the upper end of the 
> capability of conventional RSG design. 5,000 BPG with a copper-pipe static 
> gap would be, well, incredible (as in not credible?).
>
>  Regards,
>  Scott Hanson
>
> David Rieben <drieben at comcast.net> wrote:
>  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"
> To: "Tesla Coil Mailing List"
> 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 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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