Inputs
Crew size, usual wind range, priority and rig layout describe the handling problem before size is discussed.
Headsail planning
Working jib and genoa selector
Start with the headsail’s job and sheet-track geometry, then verify area, clew height and useful reefing range.
Worked example
Example: short-handed fractional cruiser
A high-clew 105–110% furling headsail may give easier tacking and visibility, with a separate reacher covering light-air power.
Tool guide
How to use and interpret this tool
It compares the everyday jobs of a working jib, overlapping genoa, furling headsail and self-tacking jib.
Decision logic
The tool weighs tacking effort, visibility, light-air power, partial-furling needs and the physical layout of the rig.
Read the result
Use the result to define the headsail's job and then verify LP, luff, clew, tracks and furler. A separate reaching sail may cover light-air power more effectively than greater overlap.
Worked example
A short-handed fractional cruiser in mixed conditions may start with a high-clew 105–110% furling sail, then add a reacher if a genuine light-air gap remains.
Common mistakes to avoid
- Choosing overlap before checking the sheet lead
- Expecting one furled sail to retain ideal shape across every wind speed
- Ignoring visibility and tacking load for the normal crew
Professional verification
This tool supports briefing and comparison. It does not replace measurement on the boat, structural engineering, class or safety rules, or a sailmaker's final design.
Continue the decision