Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
59.00 ft
J ?
19.92 ft
P ?
51.25 ft
E ?
14.50 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 | 371.6 | 34.5 |
| 100% ForetriangleI × J ÷ 2 | 587.6 | 54.6 |
| 150% GenoaTypical light-air headsail | 881.5 | 81.9 |
| Storm Jib~50% of foretriangle, high-cut | 293.8 | 27.3 |
| Symmetric SpinnakerEstimated from I, J | 2,115.5 | 196.5 |
| Total Working Sail AreaMain + 100% foretriangle | 959.2 | 89.1 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Ketch · Sparkman & Stephens design
Performance Ratios
How the Swan 50 Ms carries its sail relative to its displacement.
SA/D Ratio
13.0
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
28%
Light ballast — tends to be tender; reef earlier.
Typical Sail Inventory
What Swan 50 Ms owners usually carry and what's worth buying used vs. new.
Mainsail 371.6 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 881.5 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~646 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 293.8 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~2,116 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 Swan 50 Ms — Dacron, laminate, and cruising performance tiers.