Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
26.30 ft
J ?
6.70 ft
P ?
33.00 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 | 198.0 | 18.4 |
| 100% ForetriangleI × J ÷ 2 | 88.1 | 8.2 |
| 150% GenoaTypical light-air headsail | 132.2 | 12.3 |
| Storm Jib~50% of foretriangle, high-cut | 44.1 | 4.1 |
| Symmetric SpinnakerEstimated from I, J | 317.2 | 29.5 |
| Total Working Sail AreaMain + 100% foretriangle | 286.1 | 26.6 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Fractional Sloop · Johann Anker design
Performance Ratios
How the Dragon Int carries its sail relative to its displacement.
SA/D Ratio
19.0
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
59%
Race-oriented ballast ratio — stiff and powerful.
Typical Sail Inventory
What Dragon Int owners usually carry and what's worth buying used vs. new.
Mainsail 198.0 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 132.2 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~97 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 44.1 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~317 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 Dragon Int — Dacron, laminate, and cruising performance tiers.