Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
17.52 ft
J ?
6.80 ft
P ?
217.00 ft
E ?
162.26 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 | 17,605.2 | 1,635.6 |
| 100% ForetriangleI × J ÷ 2 | 59.6 | 5.5 |
| 150% GenoaTypical light-air headsail | 89.4 | 8.3 |
| Storm Jib~50% of foretriangle, high-cut | 29.8 | 2.8 |
| Symmetric SpinnakerEstimated from I, J | 214.4 | 19.9 |
| Total Working Sail AreaMain + 100% foretriangle | 17,664.8 | 1,641.1 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop
Performance Ratios
How the Ocean Craft 21 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
—
Ballast ratio not published.
Typical Sail Inventory
What Ocean Craft 21 owners usually carry and what's worth buying used vs. new.
Mainsail 17,605.2 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 89.4 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~66 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 29.8 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~214 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 Ocean Craft 21 — Dacron, laminate, and cruising performance tiers.