Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
40.83 ft
J ?
13.66 ft
P ?
35.16 ft
E ?
14.00 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 | 246.1 | 22.9 |
| 100% ForetriangleI × J ÷ 2 | 278.9 | 25.9 |
| 150% GenoaTypical light-air headsail | 418.3 | 38.9 |
| Storm Jib~50% of foretriangle, high-cut | 139.4 | 13.0 |
| Symmetric SpinnakerEstimated from I, J | 1,003.9 | 93.3 |
| Total Working Sail AreaMain + 100% foretriangle | 525.0 | 48.8 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · Philip Rhodes design
Performance Ratios
How the Seafarer 36C Sloop carries its sail relative to its displacement.
SA/D Ratio
13.1
Heavy and modestly canvassed — a comfortable cruiser, not fast.
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 Seafarer 36C Sloop owners usually carry and what's worth buying used vs. new.
Mainsail 246.1 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 418.3 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~307 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 139.4 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~1,004 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 Seafarer 36C Sloop — Dacron, laminate, and cruising performance tiers.