Re: TESLA MAP UPDATED

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi John,

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<FutureT-at-aol-dot-com>
> Bart, all,
>
> My various equations do not usually make
> much of a distinction between NST or pig power, since power is power.

Ok, that makes sense.

> In general,
> toroid sizes will fit a square law similar to the power input vs spark
> length equation, but using a different factor of course.  If the input
> power is quadrupled, the toroid size should be doubled.  I use a 4" x
> 13" toroid on my 600 watt coil, so a 2400 watt coil should use an
> 8" x 26" toroid from this point of view at 120 bps.  This is just a
> rough guide of course.

Ok, I understand that, but I'm curious how one determines ROC with a power
law. Are
the above watts input watts measured? I would assume the 600 watts was a meter
measurement of input power.

> I just did some quick calcs, and the Tesla Map results you
> cite do indeed fit the quidelines above for 120 bps, and result
> in a 17" by 60" toroid or so, and a larger overall diameter toroid
> could probably be used.   The toroid should be smaller for
> higher bps systems.  Richard Hull used a 13" or 15" by 60"
> toroid on his 10kVA Nemesis TC, which ran at about 500 bps,
> and was probably an actual 320 bps or so, considering missed
> firings of the async rotary.

As you know there are losses that are obviously going to reduce the toroid size
besides breakrate. Actual input power would better determine this, but it's the
cart before the horse with transformer data. I'm guilty myself of using
transformer
data for your sparklength equation. How long the actual sparklength is helps
determine efficiency of power to the spark. It's one thing to run less than
efficient with a sparklength formula, but quite another should a coiler build a
toroid and...... well, you know.

> I have no idea if Tesla Map uses the chord concept or simply the
> overall size for the toroid sizes (I didn't look at the program).
> I always use the overall sizes, never the chord concepts.  When
> I speak of a 60" toroid, I mean 60" overall major diameter.

Glad you identified this. TeslaMap is not using the major overall diameter.
This
may reduce the toroid major diameter in the program (assuming the program
did not
make this adjustment prior to evaluating the optimum toroid size - but,
maybe it
was adjusted).

Take care,
Bart