Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
25.10 ft
J ?
8.37 ft
P ?
29.04 ft
E ?
9.84 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 | 142.9 | 13.3 |
| 100% ForetriangleI × J ÷ 2 | 105.0 | 9.8 |
| 150% GenoaTypical light-air headsail | 157.6 | 14.6 |
| Storm Jib~50% of foretriangle, high-cut | 52.5 | 4.9 |
| Symmetric SpinnakerEstimated from I, J | 378.2 | 35.1 |
| Total Working Sail AreaMain + 100% foretriangle | 247.9 | 23.0 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Fractional Sloop · Koos De Ridder design
Performance Ratios
How the Friendship 25 Ts carries its sail relative to its displacement.
SA/D Ratio
19.7
Powerful cruiser/racer — quick in light air, reef early in a blow.
Mast Height (above DWL)
32.2 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 Friendship 25 Ts owners usually carry and what's worth buying used vs. new.
Mainsail 142.9 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 157.6 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~116 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 52.5 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~378 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 Friendship 25 Ts — Dacron, laminate, and cruising performance tiers.