JONMERI 40
Specifications
Hull
| LOA | 39.69 ft |
| LWL | 32.8 ft |
| Beam | 12.63 ft |
| Draft | 6.88 ft |
| Displacement | 18,900 lb |
| Ballast | 8,900 lb |
| Hull speed1.34·√LWL | 7.7 kn |
Rig & Sails
| Iforetriangle height | 53.47 ft |
| Jforetriangle base | 16.73 ft |
| Pmainsail luff | 46.75 ft |
| Emainsail foot | 13.12 ft |
| FLforestay | 16.7 ft |
| Mainsail | 778.5 sq ft |
| Jib (100%) | 447.3 sq ft |
| Spinnaker | 760.4 sq ft |
About the JONMERI 40
Shown here is an updated version with rig, keel, and rudder redesigned by Stråhlman.
The Jonmeri 40 is a robust, heavy-displacement cruising sloop designed by Jorma Nyman and built by Jonmeri in Finland. With only 30 hulls constructed in 1981, this rare vessel offers a distinct blend of Scandinavian build quality and substantial seakeeping characteristics.
- Best for:
- This boat is ideally suited for experienced coastal cruisers and those seeking a stable, comfortable platform for extended offshore passages, particularly those who prioritize motion comfort over high-speed performance.
- Bluewater capability:
- With a displacement of 18900.0 lb and a low capsize ratio of 1.9, the Jonmeri 40 is well-suited for bluewater cruising, offering exceptional stability and safety in heavy weather conditions.
- Comparables:
- Comparable vessels include the Hallberg-Rassy 42 and the Nautor's Swan 42, as they share similar heavy displacement, fin keel configurations, and a reputation for solid, conservative cruising performance from the early 1980s.
Performance
Market Price
Estimated Cost of Ownership
Based on 39.69ft LOA. Actual costs vary by condition, usage, and local rates.
Articles & Reviews
Known Issues & Pre-Purchase Inspection
13 reported issues across 7 systems for the JONMERI 40, compiled from owner reports in sailing forums and owner-association material.
Unlock the full inspection report
Thinking of buying a JONMERI 40? 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 13 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 JONMERI 40?
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.
Already know your engine? Search all engines → to find its exact parts.
Used sails that fit the JONMERI 40
Checking eBay for sails sized to this boat's rig…