Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
59.33 ft
J ?
22.21 ft
P ?
53.50 ft
E ?
20.00 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 | 535.0 | 49.7 |
| 100% ForetriangleI × J ÷ 2 | 658.9 | 61.2 |
| 150% GenoaTypical light-air headsail | 988.3 | 91.8 |
| Storm Jib~50% of foretriangle, high-cut | 329.4 | 30.6 |
| Symmetric SpinnakerEstimated from I, J | 2,371.9 | 220.4 |
| Total Working Sail AreaMain + 100% foretriangle | 1,193.9 | 110.9 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Staysail Ketch · Ted Irwin design
Performance Ratios
How the Irwin 52 carries its sail relative to its displacement.
SA/D Ratio
15.2
Moderate — comfortable coastal cruiser, not overcanvassed.
Mast Height (above DWL)
67.0 ft
Tight on the 65 ft ICW standard — check tide before transiting.
Ballast Ratio
29%
Light ballast — tends to be tender; reef earlier.
Typical Sail Inventory
What Irwin 52 owners usually carry and what's worth buying used vs. new.
Mainsail 535.0 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 988.3 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~725 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 329.4 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~2,372 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 Irwin 52 — Dacron, laminate, and cruising performance tiers.