Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
49.25 ft
J ?
13.92 ft
P ?
45.67 ft
E ?
15.25 ft
Sail Area Breakdown
Calculated from rigging dimensions. Use these as your starting point when ordering a new suit.
| Sail | Area (ft²) | Area (m²) |
|---|---|---|
| MainsailP × E ÷ 2 | 348.2 | 32.4 |
| 100% ForetriangleI × J ÷ 2 | 342.8 | 31.8 |
| 150% GenoaTypical light-air headsail | 514.2 | 47.8 |
| Storm Jib~50% of foretriangle, high-cut | 171.4 | 15.9 |
| Symmetric SpinnakerEstimated from I, J | 1,234.0 | 114.6 |
| Total Working Sail AreaMain + 100% foretriangle | 691.0 | 64.2 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Fractional Sloop · Judel/Vrolijk design
Performance Ratios
How the Najad 380 carries its sail relative to its displacement.
SA/D Ratio
15.0
Moderate — comfortable coastal cruiser, not overcanvassed.
Mast Height (above DWL)
58.3 ft
Clears the 65 ft ICW fixed-bridge standard at normal tide.
Ballast Ratio
34%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What Najad 380 owners usually carry and what's worth buying used vs. new.
Mainsail 348.2 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 514.2 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~377 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 171.4 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~1,234 ft²
Popular downwind upgrade — easier than symmetric for shorthanded sailing.
Optional
Replacement Cost Estimator
Get a rough price range for a new mainsail and genoa for the Najad 380 — Dacron, laminate, and cruising performance tiers.