Rowing Shell Oarlock Lateral/Fore-Aft Pitch Bushing, Spread & Footstretcher Calibrator

Deterministic 3D tilted-pin spherical trigonometry mapping stern/lateral pin inclination (alpha_s, alpha_l) into effective blade pitch angle P(theta_oar) from -55 to +35 deg engine (.json, .pdf, .svg) built for Concept2 Oarlocks, Empacher, Filippi Boats, Hudson Boat Works — zero-upload ephemeral Wasm RAM execution.

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