Self Capacitance of an air core coil
Medhurst formula

Capacitance (pF) = K * Diam (cm)

where K is an empirical function of Length/Diameter

L/DK
5.00.81
4.50.77
4.00.72
3.50.67
3.00.61
2.50.56
2.00.50
1.50.47
1.00.46

Summarized from Medhurst in Wireless Engineer V24.281 (Feb 1947) page 35, and V24.282 (May 1947), p. 80 by Rzeszotarski

Copyright 1998, Jim Lux / medhurst.htm / 24 Jan 1998 / Back to HV Home / Back to home page / Mail to Jim