SJ 320 Information, Review, Specs

Sailing Performance & Handling

The SJ 320 is defined by its impressive power-to-weight ratio. With a displacement of approximately 7,765 lbs and a Sail Area/Displacement (SA/Disp) ratio typically exceeding 21, the boat is categorized as a light racer-cruiser that excels in light-air conditions where heavier production yachts often struggle. Its Displacement/Length (D/L) ratio of roughly 175 confirms its pedigree as a performance-oriented design that is quick to accelerate and highly responsive to trim.

Under sail, the boat is known for its ability to point high and maintain speed through tacks, facilitated by a fractional 7/8 rig. While the original design often featured overlapping genoas, many owners have modernized the rig to utilize non-overlapping jibs on wider spreaders to improve ease of handling for short-handed crews. Anecdotal evidence from competitive IRC racing suggests the boat is exceptionally stiff due to its 37.5% ballast ratio, though its light displacement means it requires active weight on the rail in breezes exceeding 16 knots to stay "in the groove." In heavier conditions, the boat remains manageable but requires early reefing to maintain an upright attitude and prevent excessive weather helm.

Interior Comfort & Variations

Despite its racing bias, the SJ 320 offers a surprisingly functional interior for extended weekend cruising. The layout typically features a three-cabin configuration, providing a level of accommodation rarely seen in 32-foot performance designs of the mid-90s. This includes a V-berth in the bow and twin aft cabins, though some earlier versions may vary slightly in their cabinetry and berth dimensions.

The central saloon is bright, often finished in light woods or white GRP moldings to maximize the sense of space. A functional L-shaped galley is usually situated to starboard, featuring a two-burner stove and a coolbox, while a dedicated chart table sits to port. The boat’s beam of 10.33 feet allows for a social seating arrangement around a central table, though headroom is optimized for performance rather than standing tall throughout. The successor model, the Seaquest 32, improved upon the interior aesthetic with higher-quality finishes and updated systems while maintaining the same core structural layout.

Popular Mentions & Media

The SJ 320 has maintained a steady cultural presence among performance sailors, largely due to its longevity in the used market and its success in major events like Cowes Week. In recent years, the model gained significant visibility through the technical YouTube series Refit & Sail, where maritime professional George Isted documents a comprehensive structural and cosmetic restoration of an SJ 320. This media coverage has provided the sailing community with unprecedented technical insight into the construction and potential of the model.

Known Issues & Buyer’s Checklist

Prospective buyers should focus on several high-signal areas common to performance-oriented GRP yachts of this era:

• Hull Flexing & Gelcoat Cracking: Early hulls (particularly within the first ten built) have been noted to show signs of flexing in the forward sections between bulkheads. This often manifests as fine "spider" cracks in the gelcoat. While usually not structural, extensive cracking may require the installation of additional stiffening stringers.
• Rudder Bearings & Post: Like many designs featuring a high-aspect spade rudder, the SJ 320 can experience wear in the rudder bearings. Any "play" or vibration in the helm during the sea trial should be investigated.
• Keel-to-Hull Joint: Given the boat’s racing history, the joint where the fin keel meets the reinforced GRP stub should be inspected for "smile" cracks, which may indicate previous groundings or the need for re-torquing keel bolts.
• Tankage Limits: The original specifications included relatively small fuel (60L) and water (120L) tanks. Owners looking for long-range cruising often retrofit larger tanks or supplementary bladders.

Community & Resources

The SJ 320 and its siblings are well-supported by the enthusiast community, particularly in the UK and Northern Europe. Owners often share technical data through the Stephen Jones Design network, as the architect remains a respected figure in the industry. For technical refit data and structural assessments, the Refit & Sail project serves as a primary modern archive for the model.

The Verdict

The SJ 320 remains a premier choice for the sailor who refuses to sacrifice speed for comfort. While it demands a more attentive hand than a pure cruiser, its rewards are found in its nimble handling and its ability to outrun much larger yachts on the racecourse.

Pros:

• Exceptional light-air performance and upwind pointing ability.
• Surprising three-cabin accommodation for a 32-foot performance hull.
• Robust IRC rating that remains competitive decades after its launch.

Cons:

• Light displacement requires an active crew to balance the boat in a blow.
• Limited tankage and headroom compared to modern high-volume cruisers.
• Potential for gelcoat cracking in early production hulls due to forward flexing.