Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
33.00 ft
J ?
11.80 ft
P ?
28.50 ft
E ?
10.50 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 | 149.6 | 13.9 |
| 100% ForetriangleI × J ÷ 2 | 194.7 | 18.1 |
| 150% GenoaTypical light-air headsail | 292.1 | 27.1 |
| Storm Jib~50% of foretriangle, high-cut | 97.4 | 9.0 |
| Symmetric SpinnakerEstimated from I, J | 700.9 | 65.1 |
| Total Working Sail AreaMain + 100% foretriangle | 344.3 | 32.0 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · Rob Ball design
Performance Ratios
How the Cc 27 Mk I carries its sail relative to its displacement.
SA/D Ratio
18.4
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
48%
Race-oriented ballast ratio — stiff and powerful.
Typical Sail Inventory
What Cc 27 Mk I owners usually carry and what's worth buying used vs. new.
Mainsail 149.6 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 292.1 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~214 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 97.4 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~701 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 Cc 27 Mk I — Dacron, laminate, and cruising performance tiers.