Sailboat Mainsheet & Vang Tackle Purchase Sheave-Friction & Hand-Pull Calculator

Deterministic Multi-sheave tackle efficiency series product sum(eta_sheave^k) for k=1..N + mid-boom lever ratio & cascade Dyneema stroke length engine (.json, .pdf, .svg) built for Harken Carbo, Ronstan Orbit, Spinlock, Selden — zero-upload ephemeral Wasm RAM execution.

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