DUCK 31
Specifications
Hull
| LOA | 30.18 ft |
| LWL | 23.62 ft |
| Beam | 12.3 ft |
| Draft | 5.74 ft |
| Displacement | 5,512 lb |
| Ballast | 2,300.2 lb |
| Hull speed1.34·√LWL | 6.5 kn |
Rig & Sails
| Iforetriangle height | 36.68 ft |
| Jforetriangle base | 10.89 ft |
| Pmainsail luff | 40.68 ft |
| Emainsail foot | 14.27 ft |
| FLforestay | 10.9 ft |
| Mainsail | 513.2 sq ft |
| Jib (100%) | 199.7 sq ft |
| Spinnaker | 339.5 sq ft |
About the DUCK 31
Designed by Massimo Paperini and built by Avallone (ITA) starting in 1981, the Duck 31 is a fractional sloop with a displacement of 5512.0 lb and a beam of 12.3 ft. While the exact total hulls built is unknown, the fleet is characterized by a moderate comfort ratio of 11.77 and a capsize ratio of 2.79.
- Best for:
- This boat suits coastal cruisers and weekend sailors who prioritize a manageable 5512.0 lb displacement and fractional rig handling over heavy offshore endurance. It is well-suited for owners willing to perform diligent maintenance on deck cores and rigging components.
- Bluewater capability:
- With a capsize ratio of 2.79 and a fin keel with 5.74 ft max draft, the Duck 31 is primarily a coastal cruiser rather than a dedicated bluewater passagemaker, though its 2300.2 lb ballast provides adequate stability for protected offshore passages.
- Comparables:
- Comparable to other 1980s European fractional sloops with similar beam-to-length ratios, such as the Beneteau First 30 or O'Day 302, due to its 30.18 ft LOA and performance-oriented 25.2 SA/D ratio. It shares the Avallone build quality with the Duck 36 but offers a more accessible 12.3 ft beam for trailerability.
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° | 3.7 | 4.8 | 5.6 | 6.0 | 6.2 | 6.4 | 6.5 | 6.6 | 6.6 |
| 60° | 3.9 | 5.1 | 5.8 | 6.1 | 6.4 | 6.5 | 6.7 | 6.8 | 6.9 |
| 75° | 4.0 | 5.2 | 5.9 | 6.3 | 6.6 | 6.8 | 7.0 | 7.2 | 7.3 |
| 90° | 3.9 | 5.2 | 6.0 | 6.4 | 6.7 | 6.9 | 7.1 | 7.5 | 7.7 |
| 110° | 3.9 | 5.2 | 6.0 | 6.5 | 6.9 | 7.3 | 7.5 | 8.0 | 8.3 |
| 120° | 3.7 | 5.0 | 5.8 | 6.4 | 6.8 | 7.2 | 7.6 | 8.3 | 8.8 |
| 135° | 3.3 | 4.5 | 5.4 | 6.1 | 6.5 | 7.0 | 7.4 | 8.2 | 9.2 |
| 150° | 2.7 | 3.8 | 4.8 | 5.6 | 6.2 | 6.6 | 7.0 | 7.8 | 8.7 |
| Beat VMG | 2.4 | 3.2 | 3.8 | 4.2 | 4.4 | 4.5 | 4.6 | 4.7 | 4.7 |
| Run VMG | 2.3 | 3.3 | 4.2 | 4.9 | 5.6 | 6.1 | 6.5 | 7.2 | 7.9 |
Pricing
We don't have market pricing data for the DUCK 31 yet. If you own one, help other buyers — what did you pay for it? Reports build a community price estimate over time.
Estimated Cost of Ownership
Based on 30.18ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
10 reported issues across 7 systems for the DUCK 31, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a DUCK 31? This is an in-depth report on the faults this model is known for — so you know exactly what to check when you walk the boat. For the price of a coffee.
- ✓ All 10 specific issues — severity, symptoms & fixes
- ✓ Model-specific pre-purchase inspection checklist
- ✓ Downloadable PDF to take to your surveyor — yours to keep
One-time $2.99 · secure checkout by Stripe · instant access · 30 days online, PDF yours to keep
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