Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
17.80 ft
J ?
8.30 ft
P ?
20.60 ft
E ?
9.30 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 | 95.8 | 8.9 |
| 100% ForetriangleI × J ÷ 2 | 73.9 | 6.9 |
| 150% GenoaTypical light-air headsail | 110.8 | 10.3 |
| Storm Jib~50% of foretriangle, high-cut | 36.9 | 3.4 |
| Symmetric SpinnakerEstimated from I, J | 265.9 | 24.7 |
| Total Working Sail AreaMain + 100% foretriangle | 169.7 | 15.8 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Fractional Sloop · Diller & Schwill design
Performance Ratios
How the Ds 20 carries its sail relative to its displacement.
SA/D Ratio
18.1
Powerful cruiser/racer — quick in light air, reef early in a blow.
Mast Height (above DWL)
28.0 ft
Clears the 65 ft ICW fixed-bridge standard with room to spare.
Ballast Ratio
35%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What Ds 20 owners usually carry and what's worth buying used vs. new.
Mainsail 95.8 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 110.8 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~81 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 36.9 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~266 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 Ds 20 — Dacron, laminate, and cruising performance tiers.