Re: I've lost my k. Can someone help me find it?

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

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

On 26 Sep 2002, at 13:56, Tesla list wrote:

> Original poster: "Jolyon Vater Cox by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
> 
> Single-MOT coil? How do you do that?

The coil wasn't powered by a single MOT. I don't think I said that 
did I? The transformer was custom-wound by me.

Regards,
Malcolm
 
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Thursday, September 26, 2002 2:57 PM
> Subject: Re: I've lost my k. Can someone help me find it?
> 
> 
> > Original poster: "Malcolm Watts by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
> >
> > Hi Dan,
> >
> > On 25 Sep 2002, at 23:07, Tesla list wrote:
> >
> > > Original poster: "Daniel Barrett by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <dbarrett1-at-austin.rr-dot-com>
> > >
> > >     Hi List-
> > >
> > >     Thanks to everyone who helped me find my K. I spent about 3 hours
> with
> > > my single-MOT coil  today constructing an arrangement to vary my
> secondary
> > > height. I carefully measured K12 at each 1/8" interval beginning with
> the
> > > bottom turn of secondary 1/2 inch below the primary plane, all the way
> up to
> > > 4" above. Armed with this spiffy spreadsheet we went out to the backyard
> to
> > > play. After trying all the variations I came to the following
> conclusion:
> > >
> > >     "It just doesn't freekin' matter."
> > >
> > >     I don't see any sweet spots, nulls or anything exciting at all. Arc
> > > length appears to be proportional to K until it gets so high that racing
> > > arcs occur and corrona starts coming out of all the bits it isn't
> supposed
> > > to.
> > >
> > >     I get arcs about 60 inches (at 1.4kW) with k at about .19 and racing
> > > sparks above about .21.  My observations suggest that K is not something
> > > worth tweaking, at least not as important as detuning to compensate for
> > > streamer loading, spark gap, etc.
> > >
> > > Is this consistant with what others are seeing?
> >
> > You're getting about the same sparklength as I got in one coil with
> > about the same power and a bit lower k. k is not a parameter I've
> > bothered playing with much. I mainly measure it in a finished coil
> > for interest's sake.
> >
> > Regards,
> > Malcolm
> >
> > > Does it become more critical at higher power levels or other conditions?
> > >
> > > db
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> >
> 
> 
> 
>