MAMBA 311
Specifications
Hull
| LOA | 30.68 ft |
| LWL | 26.25 ft |
| Beam | 10.07 ft |
| Draft | 5.41 ft |
| Displacement | 7,716 lb |
| Ballast | 3,527 lb |
| Hull speed1.34·√LWL | 6.9 kn |
About the MAMBA 311
successor to the Mamba 31. Delivered with masthead or fractional rig.
The Mamba 311 is a compact, performance-oriented cruiser designed by Bengt Karlsson and built by Mamba Boats between 1983 and 1986. With a displacement of 7716.0 lb and a D/L ratio of 190.44, it offers a balance of speed and stability for its era.
- Best for:
- This boat suits active coastal cruisers and weekend racers who prioritize sailing performance and ease of handling over heavy bluewater provisioning. Its relatively light displacement and fin keel make it responsive in light to moderate winds.
- Bluewater capability:
- With a capsize ratio of 2.04 and a comfort ratio of 19.95, the Mamba 311 is best suited for coastal and nearshore cruising rather than extended offshore passages due to its lighter displacement and lower ballast ratio.
- Comparables:
- Comparable boats include the Cal 30 and O'Day 302, which share similar LOA dimensions and target the same market of affordable, trailerable cruisers from the early 1980s. The Mamba distinguishes itself with a more modern hull form and higher sail area-to-displacement ratio.
Performance
ORC Performance Data(2 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 | 5.5 | 6.0 | 6.3 | 6.4 | 6.5 | 6.6 | 6.6 |
| 60° | 3.6 | 4.9 | 5.7 | 6.2 | 6.4 | 6.6 | 6.7 | 6.8 | 6.8 |
| 75° | 3.8 | 5.0 | 5.9 | 6.3 | 6.6 | 6.8 | 6.9 | 7.1 | 7.2 |
| 90° | 3.7 | 5.0 | 6.0 | 6.5 | 6.7 | 6.9 | 7.0 | 7.3 | 7.5 |
| 110° | 3.7 | 5.1 | 6.0 | 6.5 | 6.9 | 7.2 | 7.4 | 7.8 | 8.1 |
| 120° | 3.5 | 4.9 | 5.9 | 6.5 | 6.8 | 7.1 | 7.4 | 8.0 | 8.6 |
| 135° | 3.1 | 4.3 | 5.3 | 6.1 | 6.6 | 6.9 | 7.2 | 7.9 | 8.9 |
| 150° | 2.5 | 3.6 | 4.7 | 5.6 | 6.2 | 6.6 | 6.9 | 7.5 | 8.3 |
| Beat VMG | 2.2 | 3.0 | 3.6 | 4.1 | 4.4 | 4.6 | 4.6 | 4.7 | 4.6 |
| Run VMG | 2.2 | 3.2 | 4.1 | 4.8 | 5.6 | 6.1 | 6.5 | 7.1 | 7.7 |
Market Price
Estimated Cost of Ownership
Based on 30.68ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
1 reported issues across 1 systems for the MAMBA 311, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a MAMBA 311? 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 1 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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