ALLMAND 31
Specifications
Hull
| LOA | 30.75 ft |
| LWL | 27.92 ft |
| Beam | 11.33 ft |
| Draft | 3.83 ft |
| Displacement | 11,100 lb |
| Ballast | 4,300.1 lb |
| Hull speed1.34·√LWL | 7.1 kn |
Rig & Sails
| Iforetriangle height | 43 ft |
| Jforetriangle base | 12 ft |
| Pmainsail luff | 36.3 ft |
| Emainsail foot | 12.5 ft |
| FLforestay | 12 ft |
| Mainsail | 478.2 sq ft |
| Jib (100%) | 246 sq ft |
| Spinnaker | 418.2 sq ft |
About the ALLMAND 31
First introduced as the SAIL 31. A similar model was advertised as the ALLMAND 312 (same hull and deck) with some differences in the interior layout. Dimensions from orig. builder literature.
The Allmand 31 is a robust, heavy-displacement cruising sloop designed by Walter Scott & T. R. Allmand and built by Allmand Boats Inc. (USA) from 1978–1985. With a displacement of 11100.0 lb and a D/L ratio of 227.68, this vessel prioritizes stability and seakeeping over speed, reflecting its origins as a serious offshore cruiser.
- Best for:
- This boat is ideally suited for experienced coastal cruisers and bluewater adventurers who value a comfortable, stable ride and are willing to perform diligent maintenance on aging systems. It appeals to owners seeking a proven, heavy-displacement platform for long-distance passages rather than high-performance racing.
- Bluewater capability:
- The Allmand 31 demonstrates strong offshore suitability with a low capsize ratio of 2.04 and a high comfort ratio of 23.52, indicating excellent stability and motion comfort in heavy weather. Its substantial ballast of 4300.1 lb and fin keel design further support its reputation as a capable bluewater cruiser.
- Comparables:
- Comparable boats include the Cal 31 and the O'Day 31, which share similar beam dimensions and heavy displacement characteristics from the late 1970s and early 1980s. These vessels are comparable because they all feature fin keels and masthead sloop rigs designed for comfortable, stable cruising in varied sea conditions.
Performance
Estimated Value
Low ConfidenceAsking price by model year
7 listings · boat years 1980–1983 · median $18,500
Each dot is one listing · hover for details · dashed red line marks the median · obvious data-entry outliers (top & bottom 2.5%) excluded.
Estimated Cost of Ownership
Based on 30.75ft LOA. Actual costs vary by condition, usage, and local rates.
Articles & Reviews
Known Issues & Pre-Purchase Inspection
12 reported issues across 6 systems for the ALLMAND 31, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a ALLMAND 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 12 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
Similar Sailboats
Which engine powers your ALLMAND 31?
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Brands sometimes mentioned for this model: Yanmar, Universal, Kubota, Westerbeke — is it one of these?
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Used sails that fit the ALLMAND 31
Checking eBay for sails sized to this boat's rig…