Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
42.00 ft
J ?
13.80 ft
P ?
36.30 ft
E ?
13.00 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 | 236.0 | 21.9 |
| 100% ForetriangleI × J ÷ 2 | 289.8 | 26.9 |
| 150% GenoaTypical light-air headsail | 434.7 | 40.4 |
| Storm Jib~50% of foretriangle, high-cut | 144.9 | 13.5 |
| Symmetric SpinnakerEstimated from I, J | 1,043.3 | 96.9 |
| Total Working Sail AreaMain + 100% foretriangle | 525.8 | 48.8 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · William Tripp Jr. design
Performance Ratios
How the Columbia 34 Mk Ii carries its sail relative to its displacement.
SA/D Ratio
16.1
Moderate — comfortable coastal cruiser, not overcanvassed.
Mast Height (above DWL)
48.0 ft
Clears the 65 ft ICW fixed-bridge standard with room to spare.
Ballast Ratio
39%
Stiff enough to carry a 150% genoa comfortably into moderate breeze.
Typical Sail Inventory
What Columbia 34 Mk Ii owners usually carry and what's worth buying used vs. new.
Mainsail 236.0 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 434.7 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~319 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 144.9 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~1,043 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 Columbia 34 Mk Ii — Dacron, laminate, and cruising performance tiers.