Measurement Center
Measurement Center — The 4-Layer Protocol
Section titled “Measurement Center — The 4-Layer Protocol”Traditional measurement forms list 50-80 data points in a flat table, making it easy to miss critical dimensions or get overwhelmed by details. Our approach is different.
Core principle: “Big picture first, details follow.” We organize measurement into four logical layers, prioritized from most critical to least.
The 4-Layer Hierarchy
Section titled “The 4-Layer Hierarchy”Layer 1: Geometry (Maximum Dimensions)
Section titled “Layer 1: Geometry (Maximum Dimensions)”Defines how big the sail can be. This is the most critical data — it sets the geometric boundaries. If L1 is wrong, the sail won’t fit the rig.
- Focus: Maximum possible space
- Key data:
- Mainsail: P (Luff max), E (Foot max)
- Headsail: I (Foretriangle height), J (Foretriangle base)
- Verification: Pythagorean check (diagonal stays)
Layer 2: Physical Constraints
Section titled “Layer 2: Physical Constraints”Defines what shape the sail can take. Within the geometric frame, how much roach is possible? Will the leech hit the backstay?
- Focus: Sail-to-rig interference
- Key data:
- Backstay: Determines mainsail roach and head width
- Spreaders: Length and sweep angle — affects headsail and mainsail clearance
- Mast Bend (Pre-bend): Determines mainsail luff curve
Layer 3: Hardware Interfaces
Section titled “Layer 3: Hardware Interfaces”Defines how the sail attaches. The finished sail must physically connect to the boat. This is the “interface” layer.
- Focus: Connection points
- Key data:
- System: Slides / Cars / Bolt rope
- Corners: Tack, Head, Clew — specific connection method (pin diameter, cutback, offset)
- Deductions: Hardware fitting allowances
Layer 4: Protection & Systems
Section titled “Layer 4: Protection & Systems”Defines durability and ease of handling.
- Focus: Where does it need reinforcement? What needs clearance?
- Key data:
- Protection: Spreader patches, lifeline height
- Handling: Reefing type, furler drum height
Documents in this Module
Section titled “Documents in this Module”The thinking behind the 4-Layer approach. Why it works, how to use it in the field, and common mistakes to avoid.
Step-by-step mainsail measurement following the L1→L4 protocol.
Headsail and furling system measurement, including foretriangle geometry, furler compatibility, and UV coverage.
(In development) Spinnaker and Code Zero measurement procedures.
Related Modules
Section titled “Related Modules”- Products — Sail systems that these measurements feed into
- Components — Hardware specifications referenced during L3 measurement