Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
45.25 ft
J ?
14.75 ft
P ?
39.50 ft
E ?
11.00 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 | 217.3 | 20.2 |
| 100% ForetriangleI × J ÷ 2 | 333.7 | 31.0 |
| 150% GenoaTypical light-air headsail | 500.6 | 46.5 |
| Storm Jib~50% of foretriangle, high-cut | 166.9 | 15.5 |
| Symmetric SpinnakerEstimated from I, J | 1,201.4 | 111.6 |
| Total Working Sail AreaMain + 100% foretriangle | 551.0 | 51.2 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · Hein Driehuyzen design
Performance Ratios
How the Sun 1030 carries its sail relative to its displacement.
SA/D Ratio
18.5
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
—
Ballast ratio not published.
Typical Sail Inventory
What Sun 1030 owners usually carry and what's worth buying used vs. new.
Mainsail 217.3 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 500.6 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~367 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 166.9 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~1,201 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 1030 — Dacron, laminate, and cruising performance tiers.