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*To*: tesla@xxxxxxxxxx*Subject*: Re: uestion*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Tue, 12 Apr 2005 21:46:45 -0600*Delivered-to*: chip@pupman.com*Delivered-to*: tesla@pupman.com*Old-return-path*: <teslalist@twfpowerelectronics.com>*Resent-date*: Tue, 12 Apr 2005 21:47:53 -0600 (MDT)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <wTnyUC.A.NpH.TZJXCB@poodle>*Resent-sender*: tesla-request@xxxxxxxxxx

1. When tuning (at low power and with a target next to the toroid) is there a max spark length one can get? Is there a mathematical equation for this? I've seen the following eqn, but I imagine it does not apply to the sparks obtained when tuning your TC.

spark length (inches) = 1.7* input power (watts)

Ben,

The formula should be

spark length (inches) = 1.7*sqrt input power (watts).

The spark length may follow the formula at lower powers when tuning but will most likely fall short. As the power is reduced, the sparks tend to have more trouble meeting the formula's "predictions". For example my old research coil gave 42" sparks at about 610 watts. But my smaller TT-32 coil only gave about 26" sparks at 380 watts. So the larger coil met the formulas expectations, but the smaller coil did not. I didn't try simply lowering the power of the TT-42 to see if the sparks gradually failed to match the formula as the power was reduced. That would have been a good test but I never tried it. My guess is that the sparks would have begun to fall short of the formula's expectations. Only fairly efficient coils will reach the formula's expectations in general.

John Freau

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