Sailboat Forestay Catenary Sag, Backstay Hydraulic Tension & Pointing-Angle Calculator

Deterministic Parabolic catenary wire sag f_sag = (q_sail * L_stay^2) / (8 * T_forestay) + masthead/fractional rig geometry backstay tension transfer engine (.json, .csv, .pdf) built for Navtec Hydraulics, Holmatro Marine, Harken, North Sails — zero-upload ephemeral Wasm RAM execution.