Barry's Coilguns

Drop in Impedance of Gun Coils
When Projectile Enters Them

(Reproduced from "Zero to Eighty" pp.330-331 by EF Northrup)

The experimental data given here (see chart below) apply only to the particular case studied.

The drop in impedance is a function of

  1. the closeness of coupling (mutual inductance),
  2. he resistance of the coils in circuit,
  3. the frequency of the current, and
  4. the ratio of the secondary resistance and reactance.

The data are accurate for the particular case considered, but are only suggestive of what the dimunition in coil impedance would be in other cases, under other conditions.

Chart of terminal impedance changes in a coil at 2000 cycles
Terminal impedance changes in a coil at 2000 cycles

Sketch of experimental set up in connection with travling wave development
Sketch of experimental set up in connection with taveling wave development

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