DEHLER 31
Specifications
Hull
| LOA | 30.84 ft |
| LWL | 24.27 ft |
| Beam | 10.17 ft |
| Draft | 4.75 ft |
| Displacement | 7,055 lb |
| Ballast | 2,865.7 lb |
| Hull speed1.34·√LWL | 6.6 kn |
Rig & Sails
| Iforetriangle height | 35.1 ft |
| Jforetriangle base | 11.15 ft |
| Pmainsail luff | 36.76 ft |
| Emainsail foot | 13.45 ft |
| FLforestay | 11.2 ft |
| Mainsail | 462.7 sq ft |
| Jib (100%) | 195.7 sq ft |
| Spinnaker | 332.7 sq ft |
Engine
| Yanmar | 2GM2018 hpSee all 31 parts → |
About the DEHLER 31
VDS #392. Also called DEHLER 32, DUETTA 94. Shallow draft: 3.6'/1.1m
Designed by E. G. van de Stadt and built by Dehler (GER) from 1984–1994, the Dehler 31 is a fractional sloop with a displacement of 7055.0 lb and a max draft of 4.75 ft. While the exact hulls built count is unknown, the model is characterized by a D/L ratio of 220.31 and a comfort ratio of 18.92, reflecting its performance-oriented yet comfortable cruising nature.
- Best for:
- This boat suits coastal cruisers and active weekend sailors who prioritize performance and modern electronics, as evidenced by the high prevalence of Raymarine and Garmin upgrades. It is well-suited for those willing to manage maintenance on older German-built fiberglass, particularly regarding deck and keel integrity.
- Bluewater capability:
- With a capsize ratio of 2.12 and a ballast of 2865.7 lb, the Dehler 31 is primarily designed for coastal cruising rather than serious bluewater passagemaking, though its robust construction allows for protected offshore passages with careful provisioning.
- Comparables:
- Comparable to other 1980s German performance cruisers like the Bavaria 33 or Beneteau First 30, the Dehler 31 shares a similar fractional sloop rig and fin keel configuration. Its beam of 10.17 ft and LWL of 24.27 ft place it in the same competitive bracket as other lightweight, fast-handling boats from that era.
Direct variant of the DEHLER 31
Near-identical models — same hull, builder and designer, re-badged or lightly changed. Specs and owner-reported issues are typically shared across the group, so a sister model's page may carry detail this one doesn't.
Performance
ORC Performance Data(20 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° | 3.4 | 4.6 | 5.4 | 5.9 | 6.2 | 6.3 | 6.4 | 6.4 | 6.4 |
| 60° | 3.6 | 4.8 | 5.6 | 6.1 | 6.4 | 6.5 | 6.6 | 6.6 | 6.6 |
| 75° | 3.8 | 5.0 | 5.8 | 6.3 | 6.5 | 6.7 | 6.8 | 6.9 | 7.0 |
| 90° | 3.6 | 4.9 | 5.9 | 6.4 | 6.7 | 6.8 | 6.9 | 7.2 | 7.3 |
| 110° | 3.6 | 5.0 | 5.9 | 6.5 | 6.8 | 7.0 | 7.3 | 7.6 | 7.9 |
| 120° | 3.5 | 4.8 | 5.8 | 6.4 | 6.7 | 7.0 | 7.3 | 7.9 | 8.3 |
| 135° | 3.0 | 4.3 | 5.3 | 6.1 | 6.5 | 6.8 | 7.1 | 7.8 | 8.7 |
| 150° | 2.5 | 3.6 | 4.7 | 5.5 | 6.2 | 6.6 | 6.8 | 7.4 | 8.2 |
| Beat VMG | 2.1 | 3.0 | 3.6 | 4.0 | 4.3 | 4.4 | 4.5 | 4.5 | 4.3 |
| Run VMG | 2.2 | 3.1 | 4.0 | 4.8 | 5.5 | 6.0 | 6.4 | 7.0 | 7.6 |
Estimated Value
Low ConfidenceAsking price by model year
18 listings · boat years 1982–1992 · median $22,105
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 30.84ft LOA. Actual costs vary by condition, usage, and local rates.
Featured YouTube Videos
Articles & Reviews
Known Issues & Pre-Purchase Inspection
21 reported issues across 8 systems for the DEHLER 31, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a DEHLER 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 21 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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Engine Parts & Maintenance
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Used sails that fit the DEHLER 31
Checking eBay for sails sized to this boat's rig…