Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
40.75 ft
J ?
17.16 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 | 349.6 | 32.5 |
| 150% GenoaTypical light-air headsail | 524.5 | 48.7 |
| Storm Jib~50% of foretriangle, high-cut | 174.8 | 16.2 |
| Symmetric SpinnakerEstimated from I, J | 1,258.7 | 116.9 |
| Total Working Sail AreaMain + 100% foretriangle | 595.8 | 55.3 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Staysail Ketch · Philip L. Rhodes design
Performance Ratios
How the Seafarer 38 Ketch carries its sail relative to its displacement.
SA/D Ratio
16.3
Moderate — comfortable coastal cruiser, not overcanvassed.
Mast Height (above DWL)
45.0 ft
Clears the 65 ft ICW fixed-bridge standard with room to spare.
Ballast Ratio
33%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What Seafarer 38 Ketch 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 524.5 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~385 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 174.8 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~1,259 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 38 Ketch — Dacron, laminate, and cruising performance tiers.