Re: Medhurst Table

• To: tesla-at-pupman-dot-com
• Subject: Re: Medhurst Table
• From: "Barton B. Anderson" <mopar-at-uswest-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Sat, 09 Jan 1999 22:34:49 -0700
• Approved: twf-at-verinet-dot-com

Antinio, Mike, and Reinhard,

Thanks for the equations. They were exactly what I was looking for.
Regarding accuracy, all faired well, even Mikes "h/d above 2 calculation".
I personally have chosen Reinhard's equation because it was easy to
incorporate in my spreadsheet with forth order accuracy (may as well be as
accurate as possible - it's just as easy for excel).

For reference and consolidation, I willl paste the equations given.

Thanks guys,
Bart


>From Antonio:
I use this formula (L=length, R=radius, in meters, capacitance in farads):
capacitance=(11.26*L+16*R+76.4*sqrt(R*R*R/L))*1e-12


From: Mike
K = 0.100976*(H/D) + 0.309630
If you want K for the entire series including (H/D) less that two, it
becomes a forth order equation.
K = 0.0005x^4 - 0.0097x^3 + 0.0648x^2 - 0.0757x + 0.4723


From: Reinhard
K = (.585-.25442*(H/D)+(.15563*(H/D)^2)-(.02777*(H/D)^3)+(.00172*(H/D)^4))
Use H/D values in cm unless converting to cm at the Cself equation.


(for reference)
Medhurst formula: C = K * D
C = solenoid self-capacitance in picofarads
D = diameter of solenoid in centimeters
K = (originally) extracted from the Medhurst table of h/d ratio's
Cself(pF) = K * (D * 2.54) <<<converting at the Cself equation

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