Re: Possible Tesla list survey

To: tesla-at-pupman-dot-com
Subject: Re: Possible Tesla list survey
From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
Date: Tue, 22 Sep 1998 04:50:46 -0600
Approved: terryf-at-verinet-dot-com

I did one of these a couple of years back (still in the hands of 
someone out there BTW ;)  One of the drawbacks of such a survey is 
that the type of sparks produced by a coil is somewhat subjective.
Further impediments to dragging useful data out included guesses
at the actual power input (often based on transformer ratings). In 
the case of NSTs I was able to make an educated guess based on cap 
size (res/nonres charging), probable gap setting etc.  In the end 
there was a fair bit of correlation between different coils based on 
power input. One thing that did seem to pop out prompted me to look 
at the merits of trying to run charging inductors with iron designed 
for efficient operation at 50Hz at break rates of 400+. There was a 
hint of a suggestion that charging efficiencies were not all they 
could be. There didn't seem to be anything special about coils with 
toploads that made frequency = 1/4 wavelength of the wire. Async 
rotaries when used with unspecified ballasting made power input calcs 
all but impossible in those cases. Secondary surge impedances were 
wide ranging but didn't seem to make a lot of difference. I'd have to 
see the chart again to do more digging.

Malcolm

> Original Poster: Steve Rodway <Legion-at-bigfoot-dot-com> 
> 
> Tesla List wrote:
> 
> > Original Poster: Greg Leyh <lod-at-pacbell-dot-net>
> >
> > > Original Poster: Steve Rodway <Legion-at-bigfoot-dot-com>
> > >
> > > Hi all,
> > >     I've been wondering if there would be any interest in an "official"
> > > tesla list survey. I figure that with around 500 members (I think) there
> > > must be at least 300 coils out there, if even half of those were entered
> > > into a survey, it would make one hell of a design resource.
> >
> > At this point, perhaps there should be a "survey of coil surveys".
> > It seems to me that over a dozen people on the List have attempted
> > some form of coil census or other, since I have been a subscriber.
> >
> > How about it?  Does anyone have a list of coil surveys, and know
> > down which black hole all of that data went?
> 
>     I was hoping to collect all that data together in the one "official"
> survey, and since it would run non-stop there would be no need for any
others,
> but as I have only had 2 positive replies ( including yourself) I must
assume
> that there is no call for one, pity.