Horse Gait Lab

An EquiPhysics learning app · equiphysics.org

1. Pick a Gait

Walk: 4-beat gait. Feet hit the ground in sequence: LH → LF → RH → RF.

2. Watch the Horse

Top view. Hooves light up when touching the ground. When you switch gaits, the horse takes a moment to transition — how fast depends on the coupling strength K in section 4 (higher K = faster lock-in).

3. Footfall Pattern

Each row is one limb. Colored bars show when the hoof is on the ground (stance); gaps are airborne (swing). The pattern scrolls in sync with the horse above, and the vertical line marks right now.

4. The Math Behind It

LH RH LF RF

dθᵢ/dt = ω + (K/3) Σⱼ≠ᵢ sin((θⱼ−θᵢ) − (φⱼ*−φᵢ*))

Each leg is a hand on its own clock ring — all four spin at the same rate. A solid dot in the shaded slice means that hoof is on the ground; a hollow dot is in the air. Coupling pulls the four clocks into a stable pattern.

In sync

Lower duty = more time airborne. Try a low duty with trot or pace to see suspension.

Target phase offsets (fraction of stride) — drag to invent your own gait:

5. Real Horse Data

80 strides from an actual horse. Each dot = one hoof hitting the ground. Dashed lines = ideal walk.