A real flying-disc aerodynamics model: lift and drag are computed from the angle of attack, and a spin-decay term reproduces the classic "turnover" curve as a fast throw slows down and rolls over late in flight.
The disc's lift and drag coefficients are modeled as functions of angle of attack α (the angle between the disc face and its direction of travel): Cₗ = Cₗ₀ + Cₗᶜ·α, Cₑ = Cₑ₀ + Cₑᶜ·(α−α₀)². Forces are F = ½ρAV²C, integrated at every timestep — this is the same structure used in published flying-disc aerodynamics studies.
Spin stabilizes the disc's roll (bank) angle like a gyroscope, but aerodynamic drag steadily bleeds off rotation. As spin decays, the disc becomes less resistant to the lift-induced roll torque and rolls further toward flat/anhyzer — the well-known "turnover" every ultimate thrower fights on a forehand or backhand.
The top-down field view shows the disc's ground track curving as it rolls; the side trace shows the true parabolic-but-lift-shaped arc. A completion needs the disc to still be above the ground and inside the field markings when it reaches the receiver's downfield distance.