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Re: The forever ongoing upgrade

Tesla List wrote:
> 
> Original Poster: grayson b dietricg <electrofire-at-juno-dot-com>
> 
> On Sun, 06 Jun 1999 22:18:10 -0600 Tesla List <tesla-at-pupman-dot-com> writes:
> >Original Poster: Bert Hickman <bert.hickman-at-aquila-dot-com>
> >
> >Tesla List wrote:
> >>
> >> Original Poster: Sebrf-at-aol-dot-com
> >>
> >> Hi all:
> >>         Since our revamped Tesla coil is up and running, it's going
> >back to
> >> the high school for more demo's.  My son's science teacher is
> >becoming a fan.
> >>         While the coil is out of the house, I'm going to build a new
> >> secondary.  I have some 4" PVC pipe and 1/2 pound of 22 gage wire.
> >What I
> >> can't decide is weather to build a 16" or a 20" coil.  And do I have
> >enough
> >> wire for the task?  Any comments would be appreciated.
> >>
> >> Rich Sebzda
> >> Your friendly neighborhood catscan repairman.
> >
> >Rich,
> >
> >Unfortunately, 1/2 pound of #22 AWG will only be enough to make a
> >winding a little over 6" long if you use schedule 40 PVC. You'll need
> >at
> >least 1.75 pounds (buy 2 pounds) of wire to wind a 20" long winding,
> >which is the length I'd recommend). A 16" coil would be too short.
> >
> >-- Bert --
> 
> I use a 16" winding on 4" schedule 40, and feeding it 12000V 60ma have
> gotten sparks nearly 30" long, with no secondary breakdown or ever even
> one strike to the primary. There are no divisions with the coil, to block
> an internal strike, but this has never happened. Am I just really lucky,
> and my coil is a disaster waiting to happen?
> 
> 
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Grayson and all,

A nicely built 2-coil system will usually achieve streamers that are 2X
winding length with no great difficulty. With proper E-field control and
a flat or stacked primary it's possible to achieve streamer lengths that
exceed 3X coil length. In general, smaller diameter coils tend to
perform better with longer winding lengths partially because the higher
inductance lowers the operating frequency. However, as you increase
input power (which most coilers do over time), coil length tends to
become THE main factor limiting coil performance. Using a winding length
that's 4" longer can potentially (npi) result in a system that "maxes
out" with streamers that are 1 foot longer... 

Safe coiling to you!

-- Bert --