Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
16.58 ft
J ?
5.41 ft
P ?
19.19 ft
E ?
7.87 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 | 75.5 | 7.0 |
| 100% ForetriangleI × J ÷ 2 | 44.8 | 4.2 |
| 150% GenoaTypical light-air headsail | 67.3 | 6.2 |
| Storm Jib~50% of foretriangle, high-cut | 22.4 | 2.1 |
| Symmetric SpinnakerEstimated from I, J | 161.5 | 15.0 |
| Total Working Sail AreaMain + 100% foretriangle | 120.4 | 11.2 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Fractional Sloop · Jacek Centkowski design
Performance Ratios
How the Sun Fast 17 Jeanneau carries its sail relative to its displacement.
SA/D Ratio
19.3
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
21%
Light ballast — tends to be tender; reef earlier.
Typical Sail Inventory
What Sun Fast 17 Jeanneau owners usually carry and what's worth buying used vs. new.
Mainsail 75.5 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 67.3 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~49 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 22.4 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~161 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 Sun Fast 17 Jeanneau — Dacron, laminate, and cruising performance tiers.