An interactive vortex-cannon laboratory. Fire smoke rings at targets, watch a shear layer roll up, and read the ring's own self-induced speed out of a simulated vorticity field. An axisymmetric vortex-filament engine with an exact elliptic-integral Biot-Savart kernel; the formation window is bisected on both edges. Pure client-side: no model, no credits, no network.

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