Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
18.25 ft
J ?
5.40 ft
P ?
18.40 ft
E ?
8.40 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 | 77.3 | 7.2 |
| 100% ForetriangleI × J ÷ 2 | 49.3 | 4.6 |
| 150% GenoaTypical light-air headsail | 73.9 | 6.9 |
| Storm Jib~50% of foretriangle, high-cut | 24.6 | 2.3 |
| Symmetric SpinnakerEstimated from I, J | 177.4 | 16.5 |
| Total Working Sail AreaMain + 100% foretriangle | 126.6 | 11.8 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Fractional Sloop · Jim Taylor design
Performance Ratios
How the Precision 165 carries its sail relative to its displacement.
SA/D Ratio
30.9
Performance-oriented — carries a lot of sail for its weight.
Mast Height (above DWL)
25.3 ft
Clears the 65 ft ICW fixed-bridge standard with room to spare.
Ballast Ratio
33%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What Precision 165 owners usually carry and what's worth buying used vs. new.
Mainsail 77.3 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 73.9 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~54 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 24.6 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~177 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 Precision 165 — Dacron, laminate, and cruising performance tiers.