Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
41.50 ft
J ?
12.00 ft
P ?
36.30 ft
E ?
12.00 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 | 217.8 | 20.2 |
| 100% ForetriangleI × J ÷ 2 | 249.0 | 23.1 |
| 150% GenoaTypical light-air headsail | 373.5 | 34.7 |
| Storm Jib~50% of foretriangle, high-cut | 124.5 | 11.6 |
| Symmetric SpinnakerEstimated from I, J | 896.4 | 83.3 |
| Total Working Sail AreaMain + 100% foretriangle | 466.8 | 43.4 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · Steve Killing design
Performance Ratios
How the Express 30M Killing carries its sail relative to its displacement.
SA/D Ratio
22.2
Performance-oriented — carries a lot of sail for its weight.
Mast Height (above DWL)
— ft
Air draft not published — measure yours before any bridge transit.
Ballast Ratio
—
Ballast ratio not published.
Typical Sail Inventory
What Express 30M Killing owners usually carry and what's worth buying used vs. new.
Mainsail 217.8 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 373.5 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~274 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 124.5 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~896 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 Express 30M Killing — Dacron, laminate, and cruising performance tiers.