Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
33.46 ft
J ?
10.33 ft
P ?
36.08 ft
E ?
13.12 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 | 236.7 | 22.0 |
| 100% ForetriangleI × J ÷ 2 | 172.8 | 16.1 |
| 150% GenoaTypical light-air headsail | 259.2 | 24.1 |
| Storm Jib~50% of foretriangle, high-cut | 86.4 | 8.0 |
| Symmetric SpinnakerEstimated from I, J | 622.2 | 57.8 |
| Total Working Sail AreaMain + 100% foretriangle | 409.5 | 38.0 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Fractional Sloop · Håkan Södergren design
Performance Ratios
How the Inferno 29 carries its sail relative to its displacement.
SA/D Ratio
20.5
Powerful cruiser/racer — quick in light air, reef early in a blow.
Mast Height (above DWL)
— ft
Air draft not published — measure yours before any bridge transit.
Ballast Ratio
37%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What Inferno 29 owners usually carry and what's worth buying used vs. new.
Mainsail 236.7 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 259.2 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~190 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 86.4 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~622 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 Inferno 29 — Dacron, laminate, and cruising performance tiers.