Design and Construction
Both hull and deck are hand-laid fiberglass in a sandwich construction, with a lead fin keel drawing roughly 1.65 to 1.75 meters depending on load anchor. The boat carries 3,968 pounds of lead ballast, a 43% ballast ratio that helps explain the reported capsize screening value of 1.86. The wetted surface runs about 27 square meters, and the immersion rate of roughly 154 kg per centimeter means the boat settles predictably under crew and stores. A stainless-steel fuel tank serves the diesel installation.
Rig and Handling
The 31 was offered with more than one rig, including a fractional sloop and an alternative fractional setup, and with the ISO 8666 reference sail her SA/D is 17.8, rising to 20.5 with a 135% genoa anchor. That places her sail area among the richer end of similar 31-footers, and period references note she carries more rig than 58% of similar sailboats. Fractional-rig dimensions are fully itemized in period references: a 32.5-meter mainsail halyard of 10 mm diameter, matching jib and spinnaker halyards, 12 mm sheets throughout for jib, genoa, and mainsheet, and a 23.6-meter mainsheet length suited to a boat of her beam. The theoretical hull speed is 6.7 knots, while the Volvo Penta 2001 diesel with saildrive is quoted at 7.0 knots, and her Relative Speed Performance is listed at 86 with a Motion Comfort Ratio of 25.7.
Accommodations
Below, the Finngulf 31 provides two cabins and six berths, a galley, and a toilet facility, with the interior finished in teak anchor. The layout is a straightforward cruising arrangement for a 31-footer of the period, offering sleeping capacity for a small family or two couples without encroaching on the working galley and head spaces. Teak joinery was the standard Scandinavian choice and gives the belowdecks a traditional feel consistent with early-1980s Finngulf interiors.
Known Issues and Variability
A notable wrinkle in the 31’s history is that the design was also sold as a home-completion project, so finished-boat quality can vary from one example to the next anchor. A buyer or reviewer cannot assume uniform yard standards across the fleet, and the sandwich construction and hand-laid work should be assessed per hull.
The Verdict
The Finngulf 31 is a thoughtfully proportioned early-Södergren cruiser-racer with a lead-ballasted fin keel, generous fractional rig options, and a practical six-berth interior. Her variable build quality as a home-completion design is the principal caveat, but the core specifications show a balanced, seaworthy small yacht with credible performance numbers for her length.
Pros
- Lead fin keel with 43% ballast ratio and 1.86 capsize screening value
- Multiple fractional rig options; sail area exceeds 58% of similar boats
- Two cabins, six berths, galley, and head in teak interior
- Hand-laid fiberglass sandwich hull and deck
Cons
- Sold as home-completed kits, so per-boat quality may vary
