BERWICK 31 (WESTERLY)
Specifications
Hull
| LOA | 31 ft |
| LWL | 25 ft |
| Beam | 9.5 ft |
| Draft | 3.58 ft |
| Displacement | 9,790 lb |
| Ballast | 4,435.8 lb |
| Hull speed1.34·√LWL | 6.7 kn |
Rig & Sails
| Pmainsail luff | 31 ft |
| Emainsail foot | 12.7 ft |
Engine
| Commonly | Volvo Penta |
About the BERWICK 31 (WESTERLY)
BERWICK 31 is an aft cockpit model. It is the twin/bilge keel version of the LONGBOW. LONGBOW, PENTLAND & RENOWN share the same basic hull. Also available as a ketch.
Designed by Laurent Giles and built by Westerly Marine Ltd. (UK) from 1973–1980, the Berwick 31 is a robust cruising sloop with 309 hulls produced. Its heavy displacement of 9790.0 lb and high D/L ratio of 279.71 reflect a design prioritizing stability and seakeeping over pure speed.
- Best for:
- This boat suits coastal cruisers and those seeking a comfortable, stable platform for extended passages, benefiting from its high comfort ratio of 28.14. It is well-regarded by owners who value the Laurent Giles pedigree and are willing to maintain classic systems.
- Bluewater capability:
- With a low capsize ratio of 1.78 and substantial ballast of 4435.8 lb, the Berwick 31 is well-suited for offshore cruising, offering excellent stability and resistance to capsizing in heavy weather.
- Comparables:
- Comparable boats include the Westerly Comet and other Laurent Giles designs like the Pegasus, sharing similar heavy-displacement characteristics and traditional cruising philosophies. They appeal to buyers seeking proven, seaworthy designs from the same era with strong resale value among classic boat enthusiasts.
Direct variant of the BERWICK 31 (WESTERLY)
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(1 certificate)
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 | 6 | 8 | 10 | 12 | 14 | 16 | 20 |
|---|---|---|---|---|---|---|---|
| 52° | 3.7 | 4.5 | 5.0 | 5.5 | 5.9 | 6.2 | 6.3 |
| 60° | 4.0 | 4.8 | 5.4 | 5.9 | 6.2 | 6.4 | 6.6 |
| 75° | 4.2 | 5.0 | 5.7 | 6.2 | 6.4 | 6.6 | 6.9 |
| 90° | 4.2 | 5.0 | 5.7 | 6.2 | 6.5 | 6.8 | 7.2 |
| 110° | 3.9 | 4.8 | 5.5 | 6.1 | 6.5 | 6.7 | 7.1 |
| 120° | 3.6 | 4.5 | 5.3 | 5.9 | 6.3 | 6.6 | 7.0 |
| 135° | 3.2 | 4.1 | 4.8 | 5.5 | 6.0 | 6.4 | 6.8 |
| 150° | 2.8 | 3.7 | 4.4 | 5.1 | 5.7 | 6.2 | 6.7 |
| Beat VMG | 2.3 | 2.8 | 3.2 | 3.5 | 3.8 | 4.1 | 4.2 |
| Run VMG | 2.5 | 3.3 | 4.1 | 4.7 | 5.3 | 5.8 | 6.5 |
Images
Pricing
We don't have market pricing data for the BERWICK 31 (WESTERLY) 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 31ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
8 reported issues across 4 systems for the BERWICK 31 (WESTERLY), compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a BERWICK 31 (WESTERLY)? 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 8 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 BERWICK 31 (WESTERLY)?
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.
Brands sometimes mentioned for this model: Volvo Penta, Yanmar — is it one of these?
Already know your engine? Search all engines → to find its exact parts.
Used sails that fit the BERWICK 31 (WESTERLY)
Checking eBay for sails sized to this boat's rig…