Inputs
Select only serviceable sails that the normal crew can set, reduce and recover. Add the sailing program and crew size that define the real operating context.
Inventory planning
Sail inventory wind-range mapper
Tick only sails that are serviceable and genuinely usable by the normal crew.
Worked example
Example: coastal cruising inventory
A mainsail, reefing system and 110% jib cover normal upwind work. Adding a furling reacher may close a light-air reaching gap more usefully than a second overlapping genoa.
Tool guide
How to use and interpret this tool
It exposes missing wind-angle coverage and unnecessary duplication across the sails the crew can actually use.
Decision logic
The tool checks whether the inventory has an everyday upwind engine, usable reduction, light-air reaching coverage, downwind coverage and a heavy-weather plan.
Read the result
A flagged gap is a discussion prompt. It does not automatically mean another sail is required; rig changes, a different crossover or better handling may solve the problem.
Worked example
A coastal cruiser with main, reefs and 110% jib may have sound upwind coverage but struggle reaching in light air. A furling reacher can fill that gap more cleanly than another overlapping genoa.
Common mistakes to avoid
- Counting a sail the crew avoids setting
- Buying two sails with almost identical crossover ranges
- Ignoring recovery and storage when judging usefulness
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