Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
44.00 ft
J ?
12.90 ft
P ?
37.80 ft
E ?
12.10 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 | 228.7 | 21.2 |
| 100% ForetriangleI × J ÷ 2 | 283.8 | 26.4 |
| 150% GenoaTypical light-air headsail | 425.7 | 39.5 |
| Storm Jib~50% of foretriangle, high-cut | 141.9 | 13.2 |
| Symmetric SpinnakerEstimated from I, J | 1,021.7 | 94.9 |
| Total Working Sail AreaMain + 100% foretriangle | 512.5 | 47.6 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · Jean Berret design
Performance Ratios
How the First 345 Beneteau carries its sail relative to its displacement.
SA/D Ratio
21.0
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
36%
Typical cruising ballast — balanced stability underway.
Typical Sail Inventory
What First 345 Beneteau owners usually carry and what's worth buying used vs. new.
Mainsail 228.7 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 425.7 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~312 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 141.9 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~1,022 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 First 345 Beneteau — Dacron, laminate, and cruising performance tiers.