Searunner 31 Information, Review, Specs

Sailing Performance & Handling

The Searunner 31 is renowned for a balanced, predictable motion that differentiates it from modern, "flighty" performance trimarans. Its handling characteristics are defined by a deep, pivoting centerboard located in the main hull, which allows for excellent upwind tracking while providing the ability to retract the board to a draft of just under 3 feet for gunkholing. The boat typically utilizes a cutter rig, often featuring an "A-frame" or specialized staysail configuration, which helps keep the center of effort low and manageable in heavy weather.

The sailing feel is often described as "stiff" due to the wide beam, though Jim Brown famously advocated for the "picket-fence" motion—a quick but small-amplitude motion that prevents the rhythmic rolling common in monohulls. Owners frequently report that the Searunner 31 excels in reaching conditions, where its slender hulls can easily exceed hull speed. However, because it was designed for cruising loads, its displacement-to-length ratio is higher than contemporary carbon-fiber counterparts. This makes the boat less prone to "hobby-horsing" in a chop, a common critique of lighter multihulls. Technical insights into the design philosophy and its performance in varied sea states are documented extensively in Jim Brown’s own literature, notably in his reflections on the Outrig Media platform, which serves as a primary repository for his design archives.

Interior Comfort & Variations

The "central cockpit" layout of the Searunner 31 is its most defining interior feature, effectively splitting the living quarters into two distinct zones. The forward cabin typically houses the main galley, a small dinette, and the V-berth, while the aft cabin serves as a separate "great cabin" or master stateroom. This separation offers a level of privacy rarely found on 31-foot vessels, though it requires the crew to cross the open cockpit to move between the two sections.

Because most Searunner 31s were owner-built, interior finishes vary wildly—from utilitarian painted plywood to high-end tropical hardwood veneers. The "wing decks" (the areas between the main hull and the outriggers/amas) provide significant storage space and internal volume that is often used for bunk extensions or technical lockers. The 31-foot model is a sibling to the larger Searunner 34 and 37, which follow the same structural logic but offer significantly more headroom. In the 31, headroom is generally adequate in the center of the main hull but tapers quickly, a trade-off for the boat's low-profile, wind-slippery silhouette.

Popular Mentions & Media

The Searunner 31 owes much of its fame to Jim Brown’s influential book, The Case for the Cruising Trimaran, which used the Searunner series as the primary example of why three hulls were superior to one for offshore work. The model also gained visibility through the voyages of cruising families in the 1970s and 80s who documented their circumnavigations in nautical periodicals like Cruising World. More recently, the Searunner philosophy has seen a resurgence in the "small boat" community through editorial features in Small Boats Magazine, which has highlighted the enduring relevance of Brown’s plywood-epoxy construction methods.

Known Issues & Buyer’s Checklist

Prospective buyers must approach a Searunner 31 with a "condition-first" mindset, as build quality depends entirely on the original creator.

• Plywood Rot: The most critical area for inspection is the integrity of the plywood core. Any breach in the fiberglass skin, particularly around the "akas" (crossbeams) and the chainplates, can lead to localized rot. A moisture meter is essential, but "thump testing" with a phenolic hammer is often more revealing on these composite structures.
• Aka-to-Hull Connections: The joints where the crossbeams meet the main hull and amas are under immense stress. Look for stress cracks in the glass work or signs of "working" (movement) in the joints.
• Centerboard Trunk: The centerboard trunk is a common site for leaks or delamination. Because it is often tucked under the cabin sole, it can be difficult to inspect, yet it is vital for the boat's structural and sailing integrity.
• Rudder Bearings: Many Searunners use a kick-up rudder assembly. The pivot points and the trunk for the rudder can wear over decades, leading to vibration or "slop" in the steering.

Community & Resources

The Searunner community is exceptionally dedicated, supported by the Searunner Owners Association, which has historically provided technical support and plan updates. While many formal associations have moved to social media platforms, the primary technical resource remains the collected works of Jim Brown and the "Constant Camber" construction community, which evolved from the Searunner lineage. Technical manuals and original build plans are still highly sought after for restoration projects.

The Verdict

The Searunner 31 remains one of the most capable offshore cruisers available for its size, offering a blend of stability and shallow-draft versatility that few modern boats can match at its price point.

Pros:

• Incredible stability and safety for a 31-foot vessel.
• Shallow draft allows for exploration of thin-water anchorages.
• Unique split-cabin layout provides excellent privacy.
• The plywood-epoxy construction is easily repairable by a handy owner.

Cons:

• Crossing the cockpit to move between cabins can be treacherous in heavy rain or cold.
• Build quality is inconsistent due to the nature of home-building.
• The central cockpit design limits the size of the "social" area compared to modern aft-cockpit cats.