Laurin 31 Sailboat Review, Specs, and Listings

The character of the Laurin 31’s interior speaks directly to its blue-water ambitions. When completed by professional Scandinavian shipyards, the cabin features rich, warm mahogany or teak joinery and a traditional, secure layout that prioritizes safety at sea over expansive open space. With its solid handrails, deep berths, and robust companionway bulkheads, the vessel is designed to feel like a protective sanctuary during long offshore passages.

Variations & Configurations

Throughout its long, low-volume production run, the Laurin 31 underwent distinct evolutionary shifts. The early hulls, commonly referred to as the Mark I, were typically built with solid fiberglass hulls and featured an encapsulated iron keel. However, the defining transition of the model came with the introduction of the Mark II variant, which applied to the final five hulls produced.

The Mark II represented a significant structural and performance upgrade. It was equipped with a denser lead keel in place of the older iron version. The superior physical properties of lead allowed for a more hydrodynamically efficient keel shape, reducing drag while concentrating weight lower in the hull to improve righting moment. Additionally, the Mark II featured freeboards raised by 20 centimeters, a shortened coachroof to enhance foredeck workspace, a more compact, ocean-ready cockpit to limit water-retention hazards, and an even more pronounced, elegant canoe-shaped Koster stern.

While the vast majority of Laurin 31s were rigged as fractional sloops—featuring easily managed headsails that simplify short-handed tacking—a small number of custom-ordered ketch rigs were completed for owners seeking a more versatile sail plan for long-distance cruising. The draft of 5.31 feet remained relatively consistent across variants, providing an optimal compromise between deep-water stability and the ability to enter typical coastal marinas.

Sailing Performance & Handling

The sailing characteristics of the Laurin 31 are defined by its substantial displacement of 12,125 pounds and a ballast-to-displacement ratio of 40.0%. At the helm, the physical implication of these figures is immediately apparent: the boat feels exceptionally stiff, upright, and unfazed by sudden gusts. Its displacement-to-length ratio of 241.12 places it firmly in the moderate-to-heavy cruising category, meaning it requires a moderate breeze to fully wake up but maintains reassuring momentum through heavy chop.

With a comfort ratio of 32.17, the Laurin 31 offers an incredibly soft, sea-kindly motion that minimizes crew fatigue. The hull resists the sharp, violent accelerations common in lighter, flatter modern production boats. Its capsize screening ratio of 1.65 is well below the industry-standard safety threshold of 2.0, validating its outstanding stability and suitability for high-latitude or blue-water voyaging.

The sail area-to-displacement ratio of 16.31 points to an efficient, conservative sail plan. While the fractional sloop rig handles effortlessly in moderate to heavy air, the boat can feel somewhat underpowered in light breezes (under 8 knots), where its wet surface area generates noticeable drag. However, once the wind rises, the balanced canoe stern works in harmony with the full keel to track straight as an arrow in a following sea, eliminating the "wagging" motion that plagues modern, wide-transom cruising hulls. The trade-off for this stellar open-ocean tracking is felt in the marina; like most full-keelers, backing under power is notoriously unpredictable, requiring a patient hand and careful calculation of prop walk.

Market Snapshot & Economics

Because only about 40 hulls were ever produced, finding a Laurin 31 on the brokerage market requires patience. They are highly coveted in Scandinavian and Northern European waters, where they command a premium compared to mass-produced fiberglass boats of the same era. They are viewed as "lifetime boats"—vessels that owners tend to keep for decades rather than trade up.

A critical economic factor for prospective buyers is the boat’s origin. Miguel Solér sold a portion of the production run as home-completed kits, meaning that the quality of the interior cabinetry, electrical wiring, and plumbing can vary wildly from one vessel to another. Professionally finished yard models command the highest prices, while home-built hulls trade at a value and often require a significant financial reserve to bring their mechanical and electrical systems up to modern cruising standards.

Known Issues & Triage

Potential owners must approach a Laurin 31 survey with a focus on age-related structural wear and the legacy of kit building.

Home-Completed Systems: Because many hulls were completed by their original buyers, the DC wiring, plumbing runs, and auxiliary installations may lack professional labeling, standardized color-coding, or proper marine-grade materials. A complete rewiring of the 12V system is often required on kit-built boats.
Chainplate and Rigging Stress: Given the boat’s heavy displacement and offshore history, the chainplates are subjected to high, sustained loads. Inspectors should look closely for crevice corrosion where the stainless-steel chainplates pass through the deck, as well as deck core rot caused by historic leaks around these penetration points.
Balsa-Cored Deck Delamination: While the hull is a solid, overbuilt fiberglass laminate, the decks of many Laurin 31s utilize sandwich construction. Any unsealed fastener holes around stanchions, winches, or handrails can introduce freshwater, leading to localized core rot and soft spots that require labor-intensive recoring.
Volvo Penta MD2B Maintenance: Many hulls were originally fitted with the raw-water-cooled, 23-hp Volvo Penta MD2B diesel. These engines are notoriously heavy, loud, and prone to internal cooling jacket scale buildup, which can cause chronic overheating. Parts are increasingly difficult to source.

Modernization & Upgrades

Many current owners are investing in comprehensive refits to transform these classic double-enders into modern, self-sufficient cruising platforms.

Repowering: Swapping the obsolete MD2B engine for modern, freshwater-cooled, lightweight diesels (such as the Yanmar 3YM30 or Beta Marine 25) is the most common upgrade. This shedding of engine weight, combined with the reliability of fresh-water cooling, drastically improves the boat's utility.
Electric Propulsion Conversion: For owners cruising localized areas or inland waterways, the Laurin 31’s easily-driven, full-keel hull shape makes it an excellent candidate for electric conversions. Systems from ePropulsion or Torqeedo, paired with a modern lithium-iron-phosphate (LiFePO4) house battery bank, are becoming increasingly common on the European canal and coastal circuit.
Sail-Handling Modernization: Veteran owners often replace the aging fractional headstay with modern roller-furling units and run control lines aft to the cockpit. Upgrading the primary winches to modern self-tailing models greatly enhances safety and ease of use for single-handed sailing.

The Verdict

The Laurin 31 is an uncompromising, heavily built classic designed for sailors who value seaworthiness, tracking stability, and traditional aesthetics over interior volume. While it will never match the accommodation space or light-air speed of a modern, beamy cruising yacht, it represents a peak era of Scandinavian boatbuilding that remains ready to cross oceans in absolute safety.