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Original poster: Jared E Dwarshuis <jdwarshui@xxxxxxxxx>

Hi: Langer

Tesla coils for producing sparks and Tesla coils for energy
transmission are likely tuned diffrently.

Sorry Matt:

I have not seen a shred of evidence that would suggest that any of the
following is true.

1) Propagation along a coil is not the same as propagation along a
straight wire.
2) Adding a topload drops the operating frequency ~50% and alters the
current distribution.



Velocity factors from radio handbooks describe the velocity down a
single wire with a ballpark figure of around .95C . Proximity to
ground and other factors presumably change this.

Velocity factors for twin leads become even more complicated. If the
current flows in opposite directions you get a diffrent velocity
factor then if they travelled in the same direction.

Velocity factor also change, when we go from an individual pulse to a
chain of sinusoidal pulses.

The only velocity factor measurements for a  Tesla coil that I am
aware of were made by Paul Nicholson and company. His subsequent
computer simulations for coils with a variety of H/D ratios showed
that the velocity factor could go as high as twice the speed of

(But our experiments demonstrate that this is not true.)


We operate coils at the wire length and have found that top end
capacitance requirements are mainly a function of the amount of
current you want to process. Large top ends have not mean a change in
tank frequency.

Large top ends may change the ratio of conduction current to
displacment current, but I would not assume that this alters the
distribution of their sum.

Sincerely: Jared Dwarshuis