My New Conical Coil Inductance Calculator
For Calculation of inductance of Conical type coils, simular to this one shown here
Here is My Formula: (((N * R) * (N * R)) / ((8 * R) + (11 * W)))-D
Formula, Copyright © 2003 
N
Number
of
Turns
R
Avg.
Radius
(inches)
W
Linear
Width of Coil
(inches)
D
Outside
Diameter
(inches)
L
Calculated
Inductance
(uH)
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**This Must be "Reset" Between Calculations**
Although this calculator gives Excellent results on my various test coils,
I assume "No Liability" from the use of this Calculator.