HARMONY 31
Specifications
Hull
| LOA | 31.17 ft |
| LWL | 24.44 ft |
| Beam | 9.19 ft |
| Draft | 4.69 ft |
| Displacement | 10,582 lb |
| Ballast | 4,409.5 lb |
| Hull speed1.34·√LWL | 6.6 kn |
Rig & Sails
| Iforetriangle height | 38.38 ft |
| Jforetriangle base | 12.3 ft |
| Pmainsail luff | 32.32 ft |
| Emainsail foot | 11.15 ft |
| FLforestay | 12.3 ft |
| Mainsail | 430.6 sq ft |
| Jib (100%) | 236 sq ft |
| Spinnaker | 401.3 sq ft |
About the HARMONY 31
(VDS design #140) The first 64 HARMONY 31 hulls were molded by Tyler Boat Co. and completed by Southern Ocean Shipyards at Poole (UK). They were the predecessors to the fin and skeg TRINTELLA II, TRINTELLA IIA, SEACRACKER 33, and TUFGLAS 33. The latter two were also built by Tyler. The HARMONY 31 was also finished and sold by Malo Yachts of Sweden (20 units between 1964-1968).
The Harmony 31 is a classic British cruiser designed by E. G. van de Stadt and built by Tyler Boat Co. Ltd. (UK) between 1964 and 1968, with a total production run of 50 hulls. This limited build count contributes to its status as a rare and specialized vessel within the vintage sailing market.
- Best for:
- This boat is best suited for experienced coastal cruisers who appreciate traditional full-keel handling and are comfortable with the maintenance requirements of a 1960s wooden or early GRP construction.
- Bluewater capability:
- With a displacement of 10582.0 lb, a capsize ratio of 1.68, and a full/long keel, the Harmony 31 possesses the heavy displacement and directional stability required for safe offshore passage making.
- Comparables:
- Comparable vessels include the Hallberg-Rassy 31 and the Tartan 31, as they share similar eras, full-keel designs, and displacement characteristics that prioritize stability over speed.
Performance
Pricing
We don't have market pricing data for the HARMONY 31 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 31.17ft LOA. Actual costs vary by condition, usage, and local rates.
Known Issues & Pre-Purchase Inspection
We don't have enough data on the HARMONY 31yet to publish model-specific findings we'd stand behind — but here's a free general inspection checklist, built from our research into what actually goes wrong on boats of this kind.
Drawn from 7,029 documented issues across 2,391 models, ordered so the areas that most often turn up problems come first.
Own a HARMONY 31? Reports from owners are what turn this into a model-specific checklist — and they're the reason the boats above it have one.
Similar Sailboats
Which engine powers your HARMONY 31?
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 HARMONY 31
Checking eBay for sails sized to this boat's rig…