SailEdge™ by SailrScience Layer 1 is designed for sailors who have an ORC certificate and normal sail measurements (luff/foot/leech/LP), but do not have a modern design export or cut sheet. It produces Edge Map decisions that match common sense: where a sail helps, and why.
← Overview Layer 2 (ORC Racing) →Layer 1 focuses on robust, explainable results without requiring loft files. It is intentionally conservative: it rewards better sails where they should win, and avoids claiming gains that the boat cannot translate into speed due to stability or control limits.
| Input | Where it comes from | Why it matters |
|---|---|---|
| ORC polar grid (TWS × TWA) | Certificate | Certified baseline and grid definition for the Edge Map |
| Rig geometry (I, J, P, E) | Certificate | Reference scale for planform proxies and CE/CLR placement |
| Sail type (Main/Genoa/Jib/Code/Asym) | UI selection | Selects the correct regime behavior and coefficient family |
| Basic sail measurements | UI input | Builds an effective planform and centroid/CE proxy |
| Material / build class | UI input | Bounded modifiers for “light vs heavy” sail behavior (durability tradeoffs) |
Many sailors can’t access (or don’t want to manage) a full cut sheet. Layer 1 still supports rational “new sail” comparisons by building a conservative effective planform from the measurements you can easily provide.
c = (ptack + phead + pclew) / 3
Represent the sail as a small set of spanwise stations (trapezoid stack), then area-weight their centroids.
Layer 1 couples sail force to heel and helm. If the sail produces force the boat can’t carry, the model reduces effective power (depower transforms) rather than claiming free speed. This is one of the core reasons the Edge Map stays realistic for average sailors.
Vhull = 1.34 × √LWL
For planing-capable hulls, the fence relaxes — but Layer 1 remains conservative by design. Higher-fidelity planing behavior is available in Layer 2 with cut-sheet inputs.
Want deeper technical detail on depower, CE/CLR coupling, and diagnostic flags? Jump to Layer 2.
The Edge Map answers three practical questions:
Example: You’re debating a Code 0 vs a smaller jib for light-air reaching. Layer 1 takes both sail measurements, runs the aero model across the full grid, and shows you green clusters in the reaching light-air cells — or not. No cut sheets required. The answer is in the cells.