Re: Voltage determination

["TruckDrivingMan" <Tom.Ansorg-at-t-online.de> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

John
When I take your formula,I have over 5 million Volt.A little much for a
6"x25" secondary,don't you think ?

Tom

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, July 26, 2000 2:49 AM
Subject: RE: Voltage determination


> Original poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
>
>
> Bart -
>
> It is a well known fact that the secondary coil inductance affects the
> length of the output spark. This is the main reason that 1000 turns are
used
> instead of 100 turns for a Tesla coil. The 1000 turns gives more
inductance
> and longer sparks. Of course there are many other design considerations.
The
> theoretical equation is
>    Vs = Vp sqrt(Ls/Lp)
> Note that when Ls is increased the secondary voltage Vs is increased which
> in turn increases the spark length. The factor I used is non linear and
> obtained from empirical data and using mathematical regression.
>
> Empirical Tesla coil design is a complex combination of many parameters
> involving both theoretical and empirical equations. The Tesla coil output
> spark length equation is obtained from empirical data and subject to many
> variations.
>
> John Couture
>
> --------------------------------
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Tuesday, July 25, 2000 11:13 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: Voltage determination
>
>
> Original poster: "Barton B. Anderson" <tesla123-at-pacbell-dot-net>
>
> Hi John,
>
> Couple questions below:
>
> Tesla list wrote:
> >
> > Original poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
> >
> > How about using the following equation that takes in the most important
> > conditions that affect the output spark? One advantage of using factors
is
> > that you do not need to know the efficiencies. The factors are based on
> > empirical data.
> >
> >   Spark length = W*Vp*Ls*B
> >
> >  W = Input watts
> >
> >  Vp = Factor for Tesla primary volts
> >
> >  Ls = Factor for secondary inductance
> >
> >  B = Factor for breaks per second
> >
> > The JHCTES program uses a similar equation.
>
>
>
> How is the secondary's inductance important to spark length? I can see
it's
> importance to Fr, but not to spark length (power processing maybe?).
> Inductance
> is a factor that naturally increases with coil size - size generally means
> more
> power applied and therefore greater spark length. Is it possible that
> inductance here is mistaken as a factor due to naturally occuring
mechanics?
> Maybe not, I just haven't seen a reason Ls would be thought of as a major
> factor to spark length, and if it is, I'd like to know why?
>
> The equation would suggest just increasing Ls to gain spark length. I'm
sure
> you didn't mean the equation in that way. Maybe you are referring to a
> higher Q
> secondary?
>
> Thanks,
> Bart
>
>
>
>
>