Jeanneau Sun Odyssey 31 Information, Review, Specs

Sailing Performance & Handling

The Sun Odyssey 31 is frequently praised for its balance between stability and agility, a characteristic inherited from Andrieu’s focus on "laminar flow" hulls. With a displacement of approximately 6,800 lbs and a ballast ratio near 38%, the boat feels stiff and secure even when the breeze freshens. It was typically offered with two keel configurations: a standard deep fin drawing 5' 9" (1.75m) and a shoal-draft version drawing 4' 9" (1.45m).

Under sail, the masthead sloop rig provides a manageable sail area-to-displacement ratio that favors easy handling for a cruising couple. Most models were equipped with tiller steering as standard, which offers sensitive feedback and allows the helm to sit well forward in the cockpit for visibility. When compared to its racing sibling, the Sun Fast 31, the Sun Odyssey variant trades raw speed for a more forgiving motion in a seaway. Owners often report that the boat tracks well upwind, provided the genoa is not oversized for the conditions, and it maintains a hull speed of roughly 6.7 knots with surprising ease in a Force 4.

Interior Comfort & Variations

For a vessel of its era and size, the Sun Odyssey 31’s interior was considered revolutionary for its use of space. Jeanneau offered two primary factory layouts to cater to different cruising styles. The "Four Person" layout prioritizes a more open saloon and a longitudinal galley, while the "Six Person" variant features a more traditional L-shaped galley and two straight settees that can serve as additional berths.

Both versions utilize a private aft cabin with a double berth tucked under the cockpit sole, a design feat that was relatively rare for 30-footers in the early 1990s. The woodwork typically consists of warm teak veneers, which, when combined with the large coachroof windows, creates a bright and airy atmosphere. Headroom is generous at the companionway, though it tapers forward. The inclusion of a dedicated aft-facing or forward-facing chart table—depending on the layout—marked the Sun Odyssey 31 as a "serious" cruiser capable of navigating beyond local bays.

Known Issues & Buyer’s Checklist

Prospective buyers of a Sun Odyssey 31 should pay close attention to several age-related technical areas common to Jeanneau models of this vintage:

• Rudder Bearings and Post: Inspect for excessive play in the spade rudder. Some owners have reported water ingress into the rudder blade itself; tapping the blade for "dead" sounds can indicate internal delamination or saturated core material.
• Window Seals: The elongated coachroof windows are prone to leaking as the original sealant degrades after decades of UV exposure. Because the plexiglass on these models is often curved or uniquely shaped, replacement can be more complex than on boats with flat, framed ports.
• Keel-to-Hull Joint: While the "smile" at the leading edge of the keel is a common sight on many production boats, any significant cracking should be investigated to ensure the internal grid (matrix) has not been compromised by a hard grounding.
• Compression Post Base: Check the base of the mast compression post under the cabin sole. If the bilge has been left wet for extended periods, the wooden block or base plate can deteriorate, leading to slight "settling" of the deck.

Community & Resources

The Sun Odyssey 31 benefits from a robust and technically savvy global following. The Jeanneau Owners Network is the premier resource for this model, hosting an extensive archive of original brochures, technical manuals, and owner-led maintenance wikis. Additionally, the Daniel Andrieu Design office remains a point of reference for the designer's historic portfolio, illustrating the technical evolution that led to this specific hull form.

The Verdict

The Jeanneau Sun Odyssey 31 remains a top-tier choice for sailors seeking a "big small boat" that manages to feel like a modern yacht despite its age. It is an ideal entry-level cruiser for those who value sailing pedigree over purely domestic volume.

Pros:

• Exceptional space management for a 30-footer, featuring a true private aft cabin.
• Proven hull design by Daniel Andrieu that offers better performance than many contemporary competitors.
• Strong build quality supported by an active and helpful owner community.

Cons:

• Aged window seals and portlights often require intensive maintenance or re-bedding.
• Shoal-draft versions sacrifice some upwind pointing ability compared to the deep-fin model.
• The original engines (often Yanmar 2GM20s) may be reaching the end of their service life if not meticulously maintained.