Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
77.10 ft
J ?
22.64 ft
P ?
70.21 ft
E ?
28.22 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 | 990.7 | 92.0 |
| 100% ForetriangleI × J ÷ 2 | 872.8 | 81.1 |
| 150% GenoaTypical light-air headsail | 1,309.2 | 121.6 |
| Storm Jib~50% of foretriangle, high-cut | 436.4 | 40.5 |
| Symmetric SpinnakerEstimated from I, J | 3,142.0 | 291.9 |
| Total Working Sail AreaMain + 100% foretriangle | 1,863.4 | 173.1 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · Edward Dubois design
Performance Ratios
How the Centurion 59 carries its sail relative to its displacement.
SA/D Ratio
20.7
Powerful cruiser/racer — quick in light air, reef early in a blow.
Mast Height (above DWL)
— ft
Air draft not published — measure yours before any bridge transit.
Ballast Ratio
34%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What Centurion 59 owners usually carry and what's worth buying used vs. new.
Mainsail 990.7 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 1,309.2 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~960 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 436.4 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~3,142 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 Centurion 59 — Dacron, laminate, and cruising performance tiers.