Re: Skinny TC problems?

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

Original poster: "Black Moon" <black_moons-at-hotmail-dot-com> 

I don't want a monster here fokes ;) I want like a 12" high coil with about 
10"~12" arcs :)
I got what I estimate to be about 0.7lb left of my 28guage wire, so it 
can't be to wide around.
And what about if I use a very large topload to get the freqency down? will 
I seen an incress in output?

As for the other guy who noted a flyback can only do a few ma, True, but im 
still trying to tune my coil :) don't need much power or high BPS for 
tuning. I do plan to get a NST someday when I can find one...

>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Skinny TC problems?
>Date: Thu, 18 Nov 2004 06:39:09 -0700
>
>Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
>
>
>Output potential is proportional to the inductance of the coil, L, x di/dt
>rate change of current.  The larger the inductance the better the output
>within reason of course.  To get the L value large the inductance goes up as
>the square of the radius of the coil, so for better performance go with the
>largest coilform you can find.
>
>Use 6 or even 8 inch dia PVC tube.  Keep secondary turns to between 1,200
>and 1,500.  This will keep your inductance, L, very high which is important.
>
>Use a height to dia (coilform) of 4.5:1 which will give you good performance
>when you get it all tuned up.
>
>Dr. Resonance
>
>Resonance Research Corporation
>E11870 Shadylane Rd.
>Baraboo   WI   53913
> >
> > Hi, I have abit of a problem with my tesla coil.. first some stats.
> > Secondary: 28 awg, 850~ turns or so, 11" winding height, 1 1/4" PVC pipe
> > (0.875" from center). 12" major diamiter toroid, about 2" minor
> > 1.5" from center primary about 8 turns, 0.01uf primary cap (Not dead set
>on
> > using this value of primary cap or primary)
> > Problem being this coil runs at the rather insane freqency of 580khz
> > according to the tesla coil calculator. allready have the secondary
> > constructed (DOH, should of calced first then built :( )
> > Iv only been able to get about 2 and 1/2" arcs no matter how much I try
>and
> > tune it, and changeing turns seems to have next to 0 effect on the output.
> > So, questions are:
> >
> > Should I keep trying to tune it?
> > If so, with such a high freqency, should I try lowering the primary cap
>and
> > using a flat primary, or is a cylinder primary ok at 1.5"?
> > Or try and lower secondary freqency?
> > if I need to lower freqency, is my only option a large toroid?
> > or is there another decent way?
> > Like puting a grounded metal mesh wall 2' around the coil?
> > Finaly, if I was going to make another coil about 12" tall winding height,
> > with 28 guage wire, (aprox 900 turns) what size PVC pipe should I get? 3"
>? 2"?
> >
> >
> >
> >
>