Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
29.42 ft
J ?
8.50 ft
P ?
32.67 ft
E ?
12.17 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 | 198.8 | 18.5 |
| 100% ForetriangleI × J ÷ 2 | 125.0 | 11.6 |
| 150% GenoaTypical light-air headsail | 187.6 | 17.4 |
| Storm Jib~50% of foretriangle, high-cut | 62.5 | 5.8 |
| Symmetric SpinnakerEstimated from I, J | 450.1 | 41.8 |
| Total Working Sail AreaMain + 100% foretriangle | 323.8 | 30.1 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Fractional Sloop · William Cook design
Performance Ratios
How the Impulse 26 carries its sail relative to its displacement.
SA/D Ratio
26.7
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
47%
Race-oriented ballast ratio — stiff and powerful.
Typical Sail Inventory
What Impulse 26 owners usually carry and what's worth buying used vs. new.
Mainsail 198.8 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 187.6 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~138 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 62.5 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~450 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 Impulse 26 — Dacron, laminate, and cruising performance tiers.