Re: 5MV, 15/120mA Tesla Coil

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

Original poster: "Richard Modistach" <hambone-at-dodo-dot-com.au> 

1.7mw out for 3kw in,
i'v heard claims of overunity
but that one takes the cake.


regards
richard
aus.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, January 06, 2004 10:47 AM
Subject: RE: 5MV, 15/120mA Tesla Coil


 > Original poster: "John H. Couture" <couturejh-at-mgte-dot-com>
 >
 >
 > Bart -
 >
 > I believe you have my TC Construction Guide. Look on page 14-12 for a
 > description of the 5MV coil and on page 5-5 for a short description of the
 > operation.
 >
 > This TC was immerged in a large tank of oil which made high voltages
 > possible. It produced 1700 KW with an input of 3 KW a gain of over 500
with
 > an energy transfer efficiency from primary to secondary circuits of about
 > 25%.
 >
 > John Couture
 >
 > -----------------------------------
 >
 >
 > -----Original Message-----
 > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > Sent: Sunday, January 04, 2004 9:06 PM
 > To: tesla-at-pupman-dot-com
 > Subject: Re: 5MV, 15/120mA Tesla Coil
 >
 >
 > Original poster: Bart Anderson <classi6-at-classictesla-dot-com>
 >
 > Does anyone have any specific details on the whole system?
 > Bart
 >
 > Tesla list wrote:
 >
 >  >Original poster: dhmccauley-at-spacecatlighting-dot-com
 >  >
 >  >I seriously doubt they were even close to 5MV.  There are problems with
 > this
 >  >that are blatantly obvious.
 >  >
 >  >1.  If this was a classic magnetically coupled tesla coil, that kind of
 >  >voltage could never form on the discharge terminal (topload) of that
 >  >secondary without
 >  >first striking over to the primary at a much lower voltage.
 >  >
 >  >2.  The topload would have to be absolutely huge to allow that kind of
 >  >voltage to build-up.  Small toroids would have a much lower break-out
 >  >voltage and there would be
 >  >a discharge at a much lower voltage that obtainable.
 >  >
 >  >3.  Also, with only 120mA at 15kV, there is not enough power available
to
 >  >get 5MV in a single discharge cycle unless you were
 >  >charge pumping a topload capacitor or similar over many cycles.  The
gain
 > is
 >  >approximately = 333 which is ENORMOUS!
 >  >Since Gain = SQRT (Cp/Cs) the secondary capacitance (self-capacitance of
 >  >secondary + topload capacitance) would have to be approximately 110,000
 >  >times
 >  >smaller than the primary capacitance!  Considering you new a large
topload
 >  >to begin with to allow the voltage to build-up that high, you would have
a
 >  >very large
 >  >primary capacitance and a 15kv/120mA transformer would NEVER be able to
run
 >  >that.
 >  >
 >  >I may be wrong here, but I think even the largest pole transformer tesla
 >  >coils (>30kW) would have trouble getting to 5MV output!
 >  >
 >  >
 >  >Dan
 >  >
 >  >
 >  > > I read somewhere a few years ago on the TCBA newsletter (I think)
about
 > a
 >  > > team of coilers (pro physisicts? can't remember) that made an 8"x40"
 >  > > secondary with ~7000 turns of 42 awg. They managed still to get 5
 > million
 >  > > volts out of it with if I remember right a 15/120 supply. I take it
that
 >  > > higher voltage doesn't necessarily mean longer spark, but am I
 > overlooking
 >  > > something else? I don't think they mentioned the output length, but
5MV
 > is
 >  > > hard to picture short.
 >  > >   What if I keep the primary inductance high and add a bigger
topload?
 >  >This
 >  > > was my original idea, but was thinking that adding a breakout point
 >  >reduces
 >  > > the effective capacitance, or does it do the equivelent of making it
a
 > big
 >  > > leakier capacitor? Can't test this without my scope and kinda chicken
to
 >  >try
 >  > > since it's not a robust tube unit.
 >  >
 >  >
 >  >
 >  >
 >
 >
 >