# Re: SSTC does 10 foot sparks

```Original poster: "John Couture" <johncouture-at-bellsouth-dot-net>

Steve -

Congratulations on your getting 10 foot output sparks from your SSTC coil
with 4800 watts input. Do you know that the power output of your Tesla coil
can be much greater than the power input? In other words the output power of
your
TC can be much greater than the input of 4800 watts. This means the power
efficiencies (power output/power input) of your TC  can be well over 100
percent. It is very difficult if not impossible to determine the true power
input or power output for a particular output spark. The ratio of power
output to power input is mostly an unknown for TC's. To my knowledge no
coiler has ever properly made these measurements.

This is why it makes more engineering sense to use energy input and energy
output in rating TC's. The energy efficiency is then equal to energy
output/energy input. This efficiency is always less than one or 100 percent
and can be measured as I have shown in the past.

As a final comment and to avoid muddying the waters I believe the statement
"4800 watts input for a 10 foot spark" is an acceptable wording for rating
TC's in a free speech country. The pictures of those sparks show that no
matter what you call them they represent a great achievement in Tesla coil
progress for SSTC's.

John Couture
---------------------------------------

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, June 18, 2004 1:52 PM
Subject: Re: SSTC does 10 foot sparks

> Original poster: "Steven Ward" <srward16-at-hotmail-dot-com>
>
> Oops, forgot to mention the power consumption is less than 4800W... not
> exactly sure because i dont have a watt meter that big but i have it both
> fused and breakered to 20A and even after quite long runs it has never
> popped the fuses or breakers.  My guess is around 4kw to make 10 foot
> sparks.  Solid State is the only way i would ever have a coil this large
at
> my house... i cant really feed a pig on my 20A line.
>
> Anyway, i ran the coil again last night for a pretty long time.  We had a
> "cage of death" set up so i limited my output to 7 feet (though it hit the
> ground at 9 feet several times as well).  At this distance there arent
> streamers... just power arcs to the cage the whole time.  The friends all
> loved it and we had a fun safe night that went without problems ;)
>
> Steve Ward
>
>
> >From: "Tesla list" <tesla-at-pupman-dot-com>
> >To: tesla-at-pupman-dot-com
> >Subject: Re: SSTC does 10 foot sparks
> >Date: Thu, 17 Jun 2004 18:54:02 -0600
> >
> >Original poster: "Brian" <ka1bbg-at-webryders-dot-net>
> >
> >Hi, NICE! do you have any idea what the power input is? you are "HOT" on
> >these ss coils! cul brian f.
> >----- Original Message -----
> >From: "Tesla list" <tesla-at-pupman-dot-com>
> >To: <tesla-at-pupman-dot-com>
> >Sent: Thursday, June 17, 2004 10:46 AM
> >Subject: SSTC does 10 foot sparks
> >
> >
> > > Original poster: "Steven Ward" <srward16-at-hotmail-dot-com>
> > >
> > > Coilers,
> > >
> > > Recently there has been a lot of advancements in the SSTC area of
coiling.
> > > Im proud to be the first (or at least i *think* im the first) to
achieve
> >10
> > > foot (or better) sparks from a solid state tesla coil!  The design is
> > > similar to that of my first ISSTC but using more robust gate drivers
and
> > > switching devices, and of course MUCH larger coils.
> > >
> > > I will eventually get the details up on my site, but for now here are
some
> > > pictures:
> > >
> > > http://www.hot-streamer-dot-com/srward16/ISSTCII/ISSTCII_goodpics/
> > >
> > > In some of the pics you will see it arcing to a green chair in the
> > > forground, this is 115"... a few times it struck out beyond that at (i
> > > approximate) 125".  And i havent even put the max voltage on it!  Im
> > > limited by the ground being so close ;)  The coil stands 5" taller
than
> > > myself at 6'11".  The output is fierce and constantly power arcs to
> >objects
> > > in the 9 foot range with some scattered action at 10+'... im sure if i
set
> > > it up just right i can get about 12 feet from this monster and that is
my
> > > goal (it was 9 feet but that was effortlessly achieved).
> > >
> > > Enjoy!
> > >
> > > All comments welcome.
> > >
> > > Steve Ward
> > >
> > > _
> > >
> > >
> > >
> >
>
> _________________________________________________________________
> Is your PC infected? Get a FREE online computer virus scan from McAfeeŽ