Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
45.83 ft
J ?
15.00 ft
P ?
43.00 ft
E ?
12.83 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 | 275.8 | 25.6 |
| 100% ForetriangleI × J ÷ 2 | 343.7 | 31.9 |
| 150% GenoaTypical light-air headsail | 515.6 | 47.9 |
| Storm Jib~50% of foretriangle, high-cut | 171.9 | 16.0 |
| Symmetric SpinnakerEstimated from I, J | 1,237.4 | 115.0 |
| Total Working Sail AreaMain + 100% foretriangle | 619.6 | 57.6 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Fractional Sloop · Finot / Conq Assoc. design
Performance Ratios
How the Beneteau 37 carries its sail relative to its displacement.
SA/D Ratio
17.1
Moderate — comfortable coastal cruiser, not overcanvassed.
Mast Height (above DWL)
— ft
Air draft not published — measure yours before any bridge transit.
Ballast Ratio
30%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What Beneteau 37 owners usually carry and what's worth buying used vs. new.
Mainsail 275.8 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 515.6 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~378 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 171.9 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~1,237 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 Beneteau 37 — Dacron, laminate, and cruising performance tiers.