Disc golf in real 3D, played and scored under the PDGA Official Rules of Disc Golf. Nine holes, fifteen PDGA-approved discs carrying the dimensions the PDGA measured for them, par from the PDGA Par Guidelines. The flight is a coupled state - position, velocity, spin axis, spin rate - and the disc curves because its centre of pressure migrates along the chord as the incidence rises: the pitching moment precesses into roll, the centre of pressure crosses the disc centre mid-flight, and the roll reverses. High-speed turn, then low-speed fade. Nothing scripts the reversal. Rules, target dimensions, disc specifications and par tables are quoted from the PDGA's published documents; flight ratings are the manufacturer's published numbers; every aerodynamic coefficient is reconstructed and labelled as such. An independent reimplementation - see CREDITS.txt for every source URL.

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