Distance between the two tips (log scale) vs time. A straight rising line is exponential divergence.
pendulum A pendulum B (offset by Δθ) C (−Δθ)
1e-4 rad
1.0×
1.0
Both arms 1 m, g = 9.81 m/s². Integrated with 4th-order Runge–Kutta at 2,000 steps per second. Space play/pause · R reset · drag a bob while paused to set a custom start.