⛵ SailboatsUSA.com — Free Download
⛵ Sail Measurement Worksheet
The standard measurements your sailmaker needs to design and quote any sail. Measure along spars — not through air. Fill in what you know; estimate the rest.
Boat Make / Model:
Year:
Rig Type:
Date measured:
Core Rig Measurements — I, J, P, E (Essential for All Sails)
Measure the boat as it sits in the water today, not from old sails (which may be stretched) or from brochure specs (which may not match your rig).
| Letter | Measurement | Where to Measure | Your Boat |
|---|---|---|---|
| P | Mainsail Luff | Along the mast from the top of the gooseneck to the maximum hoist point (black band or top of track) | ft |
| E | Mainsail Foot | Along the boom from the aft face of the mast to the maximum outhaul position (black band or end of boom) | ft |
| I | Foretriangle Height | From deck to the highest point where a genoa halyard exits the mast (or forestay attachment) | ft |
| J | Foretriangle Base | Horizontal distance along the deck from the front of the mast to where the forestay attaches to the deck | ft |
| ISP | Spinnaker Pole | From aft face of mast to pole end fitting (sets max spinnaker luff) | ft |
| TPS | Bowsprit | From bow to tack fitting on bowsprit or prod (if fitted) | ft N/A ☐ |
LP (Luff Perpendicular) — perpendicular distance from clew to luff on headsails. LP ÷ J × 100 = overlap%. Example: J=11 ft, 135% genoa → LP = 11 × 1.35 = 14.85 ft
For Ketch / Yawl — Mizzen Measurements
| Letter | Measurement | Where to Measure | Your Boat |
|---|---|---|---|
| PY | Mizzen Luff | Along the mizzenmast from gooseneck to max hoist | ft |
| EY | Mizzen Foot | Along the mizzen boom | ft |
Hardware Details (Tell Your Sailmaker)
| Item | Detail | Your Boat |
|---|---|---|
| Mast track / luff system | Slides, bolt rope, cars, groove? Size? | |
| Forestay / furling system | Brand, drum height from deck, luff extrusion diameter | |
| Hank type (if hanked-on) | Piston hank size (small/medium/large) | |
| Battens | Full or partial? How many? Pocket orientation? | |
| Reefing | Number of reefs needed in new main? | |
| UV cover (headsail) | Color preference? Which side (port/starboard)? |
Your Sailing Priorities (Tell Your Sailmaker)
Sailing style: ☐ Coastal cruising ☐ Offshore / bluewater ☐ Racing ☐ Daysailing
Priority: ☐ Maximum durability ☐ Light-air performance ☐ Heavy-weather capability ☐ Ease of handling
Shorthanded / solo sailing: ☐ Yes ☐ No
Preferred cloth: ☐ Dacron (most durable) ☐ Laminate (lower stretch) ☐ Sailmaker's recommendation
Wind range (typical): ☐ Light (under 12 kts) ☐ Moderate (12–20 kts) ☐ Full range
⛵ Full guide: sailboatsusa.com/canvas.html#sailmaker-guide — I, J, P, E explained in detail with worked examples, sailmaker directory, and material comparison (Dacron vs. Laminate vs. 3Di).