Rotary Spark Gap Tesla Coil

interactive design calculator — resonance, coupling & streamer length

Electrical resonance chain (L, C, F, k, Q) uses closed-form approximations (Wheeler current-sheet inductance, Medhurst self-capacitance, Maxwell coaxial-filament mutual inductance). The streamer/arc length figure is an empirical community correlation (JavaTC / John Freau), calibratable against a real coil. Full citations in bib/REFERENCES.md of the project repository. This is a design aid, not a safety certification — Tesla coils involve lethal voltages; always design and operate with appropriate isolation, grounding, and RF/eye/ear protection.