[TCML] Calculate Output Voltage

[Sparktron01 at comcast.net]

Hello,
    I was wondering if anybody knows of a formula to calculate the 
secondary voltage of a Tesla coil. The only one I thought to try was 
Vout=(Vin/Pri)Sec which should work with a standard transformer if Vout 
is voltage out, Vin is volts in, Pri is primary turns, and Sec is 
secondary turns. However, this seems to be returning an extremely high 
voltage.

Thanks,
Clive

--------------------------------------------------------------------------------

Clive

Generally accepted historical equation (100% effiiciency assumed) is 
Vs ~ Vp *sqrt(Ls/Lp) where L is same base unit of inductance (uH, mH, H),
and voltage values are rms equivalents.

Example:  If Vp = 20kV, Lp = 20uH (0.02mH), Ls = 20mH
then Vs (predicted) ~ 20*sqrt(1000); = 20 * 31.6 = 632kV

Actual output is on order of 40-60% of predicted, based on charge
transfer speed, coupling coefficient, top load radius of curvature,
power capability (Cp, SG BPS, kVin) and probably many more 
variables that I've overlooked.

Regards
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA