Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
16.46 ft
J ?
15.65 ft
P ?
629.00 ft
E ?
298.44 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 | 93,859.4 | 8,719.8 |
| 100% ForetriangleI × J ÷ 2 | 128.8 | 12.0 |
| 150% GenoaTypical light-air headsail | 193.2 | 17.9 |
| Storm Jib~50% of foretriangle, high-cut | 64.4 | 6.0 |
| Symmetric SpinnakerEstimated from I, J | 463.7 | 43.1 |
| Total Working Sail AreaMain + 100% foretriangle | 93,988.2 | 8,731.8 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · Gary Mull design
Performance Ratios
How the Ranger 37 carries its sail relative to its displacement.
SA/D Ratio
—
Sail Area / Displacement ratio not published.
Mast Height (above DWL)
— ft
Air draft not published — measure yours before any bridge transit.
Ballast Ratio
48%
Race-oriented ballast ratio — stiff and powerful.
Typical Sail Inventory
What Ranger 37 owners usually carry and what's worth buying used vs. new.
Mainsail 93,859.4 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 193.2 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~142 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 64.4 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~464 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 Ranger 37 — Dacron, laminate, and cruising performance tiers.