Shannon OD Information, Review, Specs

The boat is frequently referred to by its hull length of 39 feet, though it was marketed at its debut simply as the Shannon One Design to emphasize its standardized, performance-bred specifications. It was one of the first production yachts to utilize the patented SCRIMP (Seemann Composites Resin Infusion Molding Process) vacuum-bagging technology, which allowed for a significantly lighter hull with a high glass-to-resin ratio. This resulted in a vessel that was nearly 6,000 pounds lighter than the Shannon 38, yet retained the strength required for blue-water passages.

Sailing Performance & Handling

The sailing characteristics of the Shannon OD are defined by its remarkable displacement/length ratio (D/L) of approximately 147 and a sail area/displacement ratio (SA/Disp) exceeding 22. These numbers translate to a boat that is exceptionally fast in light air and capable of sustained high speeds on a reach—a stark contrast to the steady, "mushing" motion of older Shannon designs. According to editorial reviews in Cruising World, the boat was designed to plane under certain conditions, a feat rarely associated with Bristol-built cruisers.

The boat typically features a deep-fin keel with a bulb, providing a low center of gravity and excellent stiffness. Most hulls were equipped with Walter Schulz’s innovative "Scutter" rig—a hybrid between a sloop and a cutter that uses a large reacher/genoa on the headstay and a smaller working jib on an inner stay. This allows the helmsman to shift gears effortlessly as wind speeds increase without the need for frequent sail changes. On the helm, the Shannon OD is described as balanced and sensitive, tracking well due to its balanced spade rudder, which offers more bite than the traditional keel-mounted rudders found on the Shannon 43 or 38.

Interior Comfort & Variations

Despite its high-performance hull, the Shannon OD maintains the luxury and craftsmanship expected of a Schulz-designed yacht. The interior is characterized by hand-rubbed cherry or teak joinery, which contrasts with the high-tech composite hull. The standard layout features a forward owner’s cabin with a V-berth or offset double, a main salon with two settee berths, and a galley located at the foot of the companionway on the starboard side.

A key variation in the model line is the Shannon 39 (the cruising version), which sometimes featured more traditional interior appointments and a slightly heavier layup than the initial "One Design" racers. While the OD version focused on weight savings—often using cored cabinetry and minimalist fixtures—most owners eventually customized these boats for extended cruising. Headroom is generous throughout the main cabin, usually measuring around 6' 4", and the ventilation is excellent, provided by multiple stainless steel opening ports and overhead hatches.

Known Issues & Buyer’s Checklist

Prospective buyers should approach the Shannon OD with a focus on its advanced construction. Because the boat was a pioneer in the SCRIMP vacuum-infusion process, the hull-to-deck joint and the condition of the core material are paramount.

• Balsa Core Integrity: While the hulls were infused, the decks often utilized balsa or foam coring. Any unsealed hardware installations by previous owners could lead to moisture ingress. A thorough percussion test or moisture meter reading is essential around the stanchion bases and the mast step.
• Scutter Rig Hardware: The Scutter rig involves more standing and running rigging than a standard sloop. Inspect the tracks for the inner jib and the furling mechanisms for both headsails, as these systems endure high loads.
• Rudder Bearings: The balanced spade rudder provides excellent performance but puts significant stress on the bearings. Check for play in the rudder stock, especially on boats that have seen heavy offshore use.
• Keel Bolts: As a high-performance fin-keel boat, the joint between the lead bulb and the hull flange should be inspected for any "smile" or evidence of grounding, as the lighter hull structure has less tolerance for impact than a full-keel Shannon.

Community & Resources

Owners of the Shannon OD benefit from the tight-knit and active community supported by Shannon Yachts. Walter Schulz remains a primary resource for historical data, often providing original production orders and engineering blueprints to second-hand owners. While there is no dedicated class association for the 39 OD specifically, owners typically congregate within the broader Shannon Owners group, which is known for sharing technical wikis and organizing rallies on the U.S. East Coast.

The Verdict

The Shannon OD is a rare find on the brokerage market—a "wolf in sheep’s clothing" that combines the speed of a modern racer with the soul and finish of a classic New England cruiser.

Pros:

• Exceptional performance in light to moderate air compared to traditional cruisers.
• High-tech SCRIMP construction offers a stiff, light, and durable hull.
• Uncompromised interior joinery and aesthetic appeal.
• The versatile Scutter rig allows for easy sail handling for short-handed crews.

Cons:

• Deep draft may limit access to some shallow-water cruising grounds.
• Spade rudder and light displacement result in a more active motion in heavy seas than full-keel models.
• Complex rig setup requires a learning curve for those used to standard sloops.