Blasius (1999 UPCA food chain) — du/dt=a·u−a₁uv/(1+k₁u), dv/dt=−b·v+a₁uv/(1+k₁u)−a₂vw, dw/dt=−c(w−wₚ)+a₂vw. Classic a=1 b=1 c=10 a₁=0.2 a₂=1 k₁=0.05 wₚ=0.006. Dual a₁+c sliders; a/b/a₂/k₁/wₚ fixed. Display embed (u,v,w). Distinct from lotka-volterra.html (Hastings–Powell two Holling-II), willamowski.html, oregonator.html, bell.html. Bulk centroid ≈ (7.7033, 6.9251, 0.0840). RK4 food-chain chaos. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.