Rigging Dimensions
The four foretriangle measurements sailmakers need to quote a new suit.
I ?
38.86 ft
J ?
12.32 ft
P ?
34.00 ft
E ?
9.17 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 | 155.9 | 14.5 |
| 100% ForetriangleI × J ÷ 2 | 239.4 | 22.2 |
| 150% GenoaTypical light-air headsail | 359.1 | 33.4 |
| Storm Jib~50% of foretriangle, high-cut | 119.7 | 11.1 |
| Symmetric SpinnakerEstimated from I, J | 861.8 | 80.1 |
| Total Working Sail AreaMain + 100% foretriangle | 395.3 | 36.7 |
Foretriangle Diagram
Drawn to scale from published I, J, P, E measurements — Masthead Sloop · Douglas Peterson (Unauthorized) design
Performance Ratios
How the Us 29 carries its sail relative to its displacement.
SA/D Ratio
17.3
Moderate — comfortable coastal cruiser, not overcanvassed.
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 Us 29 owners usually carry and what's worth buying used vs. new.
Mainsail 155.9 ft²
Dacron cross-cut with 2 reef points is standard. Full-batten is a common upgrade.
Replace new
150% Genoa 359.1 ft²
The workhorse headsail. Most boats have one on a furler by now.
Replace new
110% Working Jib ~263 ft²
Good secondary sail for breezy days — used market is strong.
Buy used
Storm Jib 119.7 ft²
Bright orange recommended. Rarely used, hard to justify new.
Buy used
Asymmetric Spinnaker ~862 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 Us 29 — Dacron, laminate, and cruising performance tiers.