Re: Racing sparks vs. primary design

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Steve,

That was always my feeling too.  In a mistuned coil, you can get giant hot 
foot long arcs from the primary to secondary.  I think it is just pure 
transformer action.  20kV in 15 turns to say 200kV in 150 turns...

Cheers,

        Terry

At 04:23 AM 7/9/2005, you wrote:
> Hi all
>
> The discussion between John Freau and Jim Mora got me thinking.
>
> I have been wondering for a while whether the voltage profile on the 
> secondary is determined by the shape of the primary. I think a little 
> solenoid primary that hugs the bottom of the secondary will induce most 
> voltage in the bottom of the secondary. Because of its small size, the 
> field is very intense near to the primary coil and dies away quickly with 
> distance, so it will roast the bottom of the secondary while hardly 
> touching the top.
>
> Hence I expect it will give racing sparks sooner than a large diameter 
> solenoid, cone, or pancake that "throws" the field further up and spreads 
> it more evenly over the secondary. Even if both primaries had the same 
> overall coupling coefficient.
>
> Does anyone have any thoughts on this?
>
> Steve Conner