Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
52.00 ft
J ?
18.30 ft
P ?
47.00 ft
E ?
17.30 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 | 406.6 | 37.8 |
| 100% ForetriangleI × J ÷ 2 | 475.8 | 44.2 |
| 150% GenoaTypical light-air headsail | 713.7 | 66.3 |
| Storm Jib~50% of foretriangle, high-cut | 237.9 | 22.1 |
| Symmetric SpinnakerEstimated from I, J | 1,712.9 | 159.1 |
| Total Working Sail AreaMain + 100% foretriangle | 882.4 | 82.0 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Cutter · Mark Ellis/Hinterhoeller design
Performance Ratios
How the Aurora 40 carries its sail relative to its displacement.
SA/D Ratio
17.8
Moderate — comfortable coastal cruiser, not overcanvassed.
Mast Height (above DWL)
56.5 ft
Clears the 65 ft ICW fixed-bridge standard at normal tide.
Ballast Ratio
33%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What Aurora 40 owners usually carry and what's worth buying used vs. new.
Mainsail 406.6 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 713.7 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~523 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 237.9 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~1,713 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 Aurora 40 — Dacron, laminate, and cruising performance tiers.