Mega-Sized Secondaries

["Albert Hassick" <uncadoc-at-xxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

Uh, excuse me for asking, but what is it that is so terribly bad about
this commercially offered system.  Most people cannot even get their
coils up to these specs when they build their first coil. I think this
outfit does an ok job considering the usual beginner coil.  And what is
wrong with winding a Tesla secondary on a cardboard form?   I have wound
many on cardboard and they all work great!   Al.


On Fri, 27 Oct 2000 11:54:44 -0600 "Tesla list" <tesla-at-pupman-dot-com>
writes:
> Original poster: "acmnovak" <acmnovak-at-email.msn-dot-com> 
> 
> Dan-
> I think what is seen on the btc-5 (stands for "big tesla coil") is 
> what we
> coilers call a "hackjob".  The folks at amazing1-dot-com are not tesla 
> coil
> specialists, and aren't all that good at making them. Notice they 
> don't
> actually sell model btc-5, but only the plans for it.  I've seen the 
> plans
> for it an, let me say,  they were quite a laugh.  The secondary is 
> wound on
> a big carboard from (spacewound) with #22 if my memory serves me 
> correctly.
> The power is supplied by a pig, the caps are commercial, there are 
> air
> chokes, and an ASYNC RSG all in the same package. This is the best 
> example
> of tesla coil inefficiency.  The coil runs at excessive break rates 
> with
> small bang size which really sin't any good for "conventional" 
> coils.
> However, if one were to design a magnifying coil to increase the 
> output,
> much better results "might" be achived.  The coupling factor leaves
> something to be desired but at least it avoids arcs...
> Anywho, The secondary on the btc-5 is NOT wound in sections. It is 
> simply
> wrapped in electrical tape to provide a small satndoff to the 
> voltage
> gradient in the middle of the coil. If the tape were not in place, 
> the coil
> would have racing sparks and probably burn down. How do i know this? 
> Well,
> My first coil had such problems. .. Keep in mind this was before the
> popularity of SRSGs and MMCs. I had a 4"x14" secondary which had 
> racing
> sparks because of the helical primary I made. Needless to say this 
> is a
> badthing (tm).
> Moral of the story...
> DO NOT design your coils like the ones seen at amazing1-dot-com... they 
> are
> crap-tacular (tm).
> Geez they are over priced too, the smallest coil can be constructed 
> for
> about $30 but they sell it for WAY more...
> My 2 cents,
> 
> -Michael
> 
> ----- Original Message -----
> From: Tesla list <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Friday, October 27, 2000 9:18 AM
> Subject: Mega-Sized Secondaries
> 
> 
> > Original poster: "Dan Kunkel" <dankunkel-at-hotmail-dot-com>
> >
> > Tesla Enthusiasts,
> >
> > I have notice that (some) extremely large Tesla Coils have the 
> secondaries
> > wound in several sections. At least that is what it appears to be. 
> For an
> > example check out the BTC 5 coil at the bottom of the page...
> >
> > http://www.amazing1-dot-com/tesla.htm
> >
> > You can see several black sections indicating a space in windings 
> on the
> > secondary. Why is this done?
> >
> > Dan
> > 
>
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