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Re: Medhurst Formula



The same relation is given in the following formulae:

'Cd = 5.08*R*(.0563*L/R+.08+.38*SQR(R/L)) 'uufd. DIMENSIONS IN INCHES

'Cd = 2*R*(.0563*L/R+.08+.38*SQR(R/L)) 'uufd. DIMENSIONS IN CENTIMETERS

'WHERE R IS THE RADIUS AND L IS THE LENGTH.  "SQR(X)" MEANS THE SQUARE
'ROOT OF X.

This, plus Wheeler's approximate inductance formula, has given
me very good results in prediction self-resonant frequency of a
number of coils I have built here.
Ed Phillips