BONIN 31
Specifications
Hull
| LOA | 30.84 ft |
| Beam | 10.99 ft |
| Draft | 6.56 ft |
| Displacement | 6,614 lb |
Rig & Sails
| Iforetriangle height | 39.47 ft |
| Jforetriangle base | 11.71 ft |
| Pmainsail luff | 39.24 ft |
| Emainsail foot | 13.45 ft |
| FLforestay | 11.7 ft |
| Mainsail | 516.1 sq ft |
| Jib (100%) | 231.1 sq ft |
| Spinnaker | 392.9 sq ft |
About the BONIN 31
The Bonin 31 is a fractional sloop designed by Mario Cossutti and built by Bonin (ITA) in 2007. With a displacement of 6614.0 lb and a capsize ratio of 2.35, this vessel represents a specific, limited-production entry in the market, as the total hulls built count is currently unknown.
- Best for:
- This boat suits coastal cruisers and light offshore sailors who prioritize a manageable 6614.0 lb displacement and a 10.99 ft beam for stability. Its fractional sloop rig and 22.55 SA/D ratio indicate it is well-suited for performance-oriented day sailing and short passages.
- Bluewater capability:
- With a low capsize ratio of 2.35 and a fin keel, the Bonin 31 offers reasonable offshore stability, though its limited production history and lack of extensive bluewater owner reports suggest it is best suited for coastal and nearshore cruising rather than extended ocean passages.
- Comparables:
- Comparable boats include other Italian-built fractional sloops from the mid-2000s with similar displacements around 6614.0 lb, such as the Beneteau First 31 or Dufour 31. These vessels share the same era, fractional rig configuration, and target audience of performance cruisers.
Performance
ORC Performance Data(3 certificates)
Measured performance data from ORC (Offshore Racing Congress) certificates.
Polar Diagram
Boat speed (kn) vs. true wind angle. Source: ORC
Racing Ratings
Triple Number
ORC Measured
Sail Areas (ORC)
Speed Table (kn)
| TWA \ TWS | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 20 | 24 |
|---|---|---|---|---|---|---|---|---|---|
| 52° | 4.0 | 5.3 | 6.2 | 6.7 | 7.0 | 7.1 | 7.1 | 7.2 | 7.1 |
| 60° | 4.3 | 5.6 | 6.4 | 6.9 | 7.1 | 7.3 | 7.3 | 7.4 | 7.4 |
| 75° | 4.4 | 5.8 | 6.6 | 7.0 | 7.3 | 7.5 | 7.7 | 7.9 | 8.0 |
| 90° | 4.3 | 5.7 | 6.6 | 7.1 | 7.3 | 7.6 | 7.9 | 8.4 | 8.6 |
| 110° | 4.2 | 5.7 | 6.7 | 7.2 | 7.7 | 8.0 | 8.3 | 8.8 | 9.1 |
| 120° | 4.0 | 5.5 | 6.5 | 7.1 | 7.6 | 8.1 | 8.6 | 9.4 | 10.2 |
| 135° | 3.5 | 4.9 | 6.1 | 6.8 | 7.3 | 7.8 | 8.3 | 9.7 | 12.3 |
| 150° | 2.9 | 4.2 | 5.3 | 6.3 | 6.9 | 7.3 | 7.8 | 8.8 | 10.8 |
| Beat VMG | 2.5 | 3.5 | 4.2 | 4.7 | 5.0 | 5.1 | 5.1 | 5.1 | 5.0 |
| Run VMG | 2.5 | 3.6 | 4.6 | 5.5 | 6.1 | 6.7 | 7.1 | 7.9 | 9.4 |
Market Price
Estimated Cost of Ownership
Based on 30.84ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
We don't have enough data on the BONIN 31yet to publish model-specific findings we'd stand behind — but here's a free general inspection checklist, built from our research into what actually goes wrong on boats of this kind.
Drawn from 7,029 documented issues across 2,391 models, ordered so the areas that most often turn up problems come first.
Own a BONIN 31? Reports from owners are what turn this into a model-specific checklist — and they're the reason the boats above it have one.
Similar Sailboats
Which engine powers your BONIN 31?
We haven't confirmed the engine for this model yet. If you own or know one, tell us — as owners report in, we build an accurate picture over time.
Already know your engine? Search all engines → to find its exact parts.
Used sails that fit the BONIN 31
Checking eBay for sails sized to this boat's rig…