Sunwind 31 Information, Review, Specs

Sailing Performance & Handling

The Sunwind 31 is defined by its stiff, predictable motion and a ballast ratio approaching 40%, which allows it to stand up well to its canvas in a breeze. According to technical data from Skippo, the vessel utilizes a fractional 7/8 rig with swept-back spreaders, a configuration that simplifies headsail changes and enhances pointing ability. With a displacement-to-length (D/L) ratio of approximately 278, it is classified as a moderate-to-heavy cruiser, prioritizing momentum and sea-kindliness over raw acceleration.

Under sail, the fin keel and spade rudder provide high maneuverability, though the boat lacks the extreme directional stability of Sundén’s earlier long-keel designs. Anecdotal reports from Scandinavian testers suggest the boat feels balanced and light on the helm, particularly when the main is reefed early to manage its relatively large mainsail area. While the fractional rig makes tacking effortless in tight channels, the boat’s moderate sail area-to-displacement ratio of roughly 16.0 indicates it requires a spinnaker or gennaker to maintain competitive speeds in light following winds.

Interior Comfort & Variations

The interior of the Sunwind 31 reflects the high standard of Finnish woodworking common in the 1980s, typically finished in satin-varnished teak. The layout is traditional: a forward V-berth with an overhead hatch, followed by a saloon featuring two longitudinal settees and a central folding table. A notable feature described by Sailguide is the L-shaped galley located to starboard of the companionway, which usually includes a two-burner stove and oven. Opposite the galley sits a dedicated navigation station and a separate head compartment, which was considered generous for a 31-foot boat of its era.

Sibling models introduced significant variations to this footprint. While the original Sunwind 31 focused on a traditional layout with a quarter berth, the subsequent Sunwind 311 utilized a different interior mold to increase volume, moving the head further aft and refining the aft cabin space. The Sunwind 27 and 29 models serve as smaller alternatives that share the same Sundén design language but lack the standing headroom and separate head compartment functionality of the 31.

Known Issues & Buyer’s Checklist

Potential buyers should approach a Sunwind 31 with a focus on three primary technical areas:

• Rudder and Bearings: Like many spade-rudder boats of this vintage, the rudder bearings are prone to wear, leading to "play" in the helm. Furthermore, the rudder blade itself is a glass-encapsulated foam core; any impact or deep scratches can lead to water ingress and subsequent delamination or internal corrosion of the rudder post.
• Sail-Drive Maintenance: Most units were originally equipped with Volvo Penta 2000-series diesel engines mated to an S-drive. It is critical to verify the age of the rubber hull seal (the "bellows"), which Volvo Penta recommends replacing every seven years, though many owners extend this interval at their own risk.
• Deck Core Integrity: The balsa-cored sandwich deck provides excellent thermal insulation, but the hardware fittings (cleats, stanchions, and the baby-stay mount) must be checked for moisture. Portions of the deck near the mast step are particularly susceptible to compression or delamination if the sealant has failed over the decades.
• Iron Keel Oxidation: The cast-iron keel requires consistent epoxy coating to prevent "rust bleeding." Buyers should inspect the keel-to-hull joint for "smile" cracks, which may indicate the need for re-torquing the keel bolts or replacing the sealant.

Community & Resources

The primary hub for technical support and historical documentation is the Sunwindklubben, a dedicated owner’s association based in Sweden. This organization maintains an archive of original manufacturer brochures, rig dimensions, and DIY guides for common repairs like window replacement and engine upgrades.

The Verdict

The Sunwind 31 remains a sought-after entry-level cruiser for those valuing Scandinavian build quality and classic aesthetics over modern "caravan" style volume.

Pros:

• High-quality teak joinery and robust Finnish construction.
• Excellent stability and "big boat" feel in heavy weather.
• Manageable fractional rig ideal for short-handed sailing.
• Strong community support through the Sunwind Club.

Cons:

• Aft-cabin and head volume are tighter than modern 31-footers.
• Maintenance-heavy iron keel and sail-drive system.
• Original fuel and water capacities are modest for extended off-grid cruising.