Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
27.00 ft
J ?
9.58 ft
P ?
21.75 ft
E ?
9.00 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 | 97.9 | 9.1 |
| 100% ForetriangleI × J ÷ 2 | 129.3 | 12.0 |
| 150% GenoaTypical light-air headsail | 194.0 | 18.0 |
| Storm Jib~50% of foretriangle, high-cut | 64.7 | 6.0 |
| Symmetric SpinnakerEstimated from I, J | 465.6 | 43.3 |
| Total Working Sail AreaMain + 100% foretriangle | 227.2 | 21.1 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · Capital Yachts Inc. design
Performance Ratios
How the Neptune 24 Cb carries its sail relative to its displacement.
SA/D Ratio
18.5
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
38%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What Neptune 24 Cb owners usually carry and what's worth buying used vs. new.
Mainsail 97.9 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 194.0 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~142 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 64.7 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~466 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 Neptune 24 Cb — Dacron, laminate, and cruising performance tiers.