Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
50.00 ft
J ?
15.40 ft
P ?
45.80 ft
E ?
13.20 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 | 302.3 | 28.1 |
| 100% ForetriangleI × J ÷ 2 | 385.0 | 35.8 |
| 150% GenoaTypical light-air headsail | 577.5 | 53.7 |
| Storm Jib~50% of foretriangle, high-cut | 192.5 | 17.9 |
| Symmetric SpinnakerEstimated from I, J | 1,386.0 | 128.8 |
| Total Working Sail AreaMain + 100% foretriangle | 687.3 | 63.9 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · Robert Perry design
Performance Ratios
How the Reliance 37 carries its sail relative to its displacement.
SA/D Ratio
16.6
Moderate — comfortable coastal cruiser, not overcanvassed.
Mast Height (above DWL)
— ft
Air draft not published — measure yours before any bridge transit.
Ballast Ratio
33%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What Reliance 37 owners usually carry and what's worth buying used vs. new.
Mainsail 302.3 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 577.5 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~424 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 192.5 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~1,386 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 Reliance 37 — Dacron, laminate, and cruising performance tiers.