Re: A 1/4 wave Tesla coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-uswest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Barry,

On 7 Feb 01, at 17:27, Tesla list wrote:

> Original poster: "B2 by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <bensonbd-at-erols-dot-com>
> 
> > Performance:
> > Operating frequency: 280khz
> > Spark length with no breakout tab: multiple arcs 48"(+)
> > Spark length with breakout tab: single arcs 60"(+), very, very thick
> > Interesting note: With no Cop, arcs are close to 42" from top
> > terminal, but coil is obviously poorly tuned and much corona around
> > top turns of secondary.
> 
> Hi Skip(1),
>     I've seen John Freau's coil make sparks about this long with about
>     half
> as much energy (HTSTWMOE(2)).  It would be an informative experiment
> to halve the primary capacitance and add a few more turns to the
> primary to bring it back into tune (start with it undercoupled).  John
> Freau used #12 PVC insulated wire (machine tool wire?) for his primary
> with about 34 (?) turns.  After seeing this I will never build a
> subpig system with copper tubing.

Are the physical secondary sizes comparable (i.e. capacitances)? That 
result could be explained by a difference in output voltage could it 
not?

Regards,
malcolm