Re: [TCML] New coil modeled after Green Monster

[futuret@xxxxxxx]

Bill,

Seems to me the problem you mentioned of the burning secondary sounds like
the coil was too tightly coupled.  If you repaired the secondary after the burning,
maybe there was still some carbon tracking in the secondary form which led
to further breakdown.  This persistent burning problem is rather rare and usually
has a very simple solution.  There are generally no mysterious causes for such
an event.  I realize you said you played a lot with the secondary spacing.  Maybe
there was some carbon burning in the form.  Or maybe even with your furthest
secondary spacing, it was still too closely coupled.  

If the gap is not quenching well, this can cause racing sparks on the secondary,
but usually they occur all over the secondary, not just at the bottom.  

But in any case by copying an existing design, you should avoid problems as
you suggested.

John

 

 


 

 

-----Original Message-----
From: Bill Fuller <bfuller@xxxxxxxxxxxxxx>
To: tesla@xxxxxxxxxx <tesla@xxxxxxxxxx>
Sent: Fri, Jul 9, 2010 12:22 pm
Subject: [TCML] New coil modeled after Green Monster




Hello everyone,



It's been a while since I've been coiling and I'm ready to upgrade my current 

coil.



Currently running a 10" coil with 6 to 8 foot sparks.



Looking to up-scale to a 12". I've had some issues with my 10" burning the 

secondary about 3" up from the primary and hope to avoid this on the 12" coil. 

Endless playing with primary to secondary spacing didn't tell me anything. It's 

not a primary to secondary arc, it seems to be shorting secondary turns after 

running for a few minutes. Been through 3 secondaries and all had the same 

problem. Flashover perhaps, something geometry related with this design I think.



That said, I was wondering if anyone can provide me with some core spec's on the 

green monster coil so I can use it as a base model for my next. David, still 

around???



I've looked at the YouTube videos and flickr pictures many times. This coil 

makes long runs with minimum flashover and throws arcs quite a distance. Nice 

work.



Anyway, I have been able to collect some specs (please correct if wrong);



Secondary: 12.5" x 54", 49" of #19 wire

Topload 12" x 56"

Cap BNZ 2500-104  0.1uF

Primary to secondary spacing 1.5"



Looking for some specifics to avoid flashover and burned secondarys.



Secondary height above primary:

Toroid height above secondary:





For a sanity check on my design it would be nice to know (you may or may not 

have this info...):

Primary and secondary resonant freq.

Coupling factor

Primary and secondary inductance





Thanks in advance!!!



Bill





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