S2 9.1 SM Information, Review, Specs

Sailing Performance & Handling

The S2 9.1 SM is defined by its "slippery" Graham & Schlageter hull form, which excels at minimizing wetted surface area while maintaining enough beam for stability. With a displacement-to-length (D/L) ratio of approximately 224, it sits firmly in the "light cruiser/offshore racer" category. The boat is remarkably responsive, often described by owners as having an "accelerator pedal" feel when caught in a puff. Unlike many of its contemporaries that utilized unbalanced rudders, the 9.1 features a deep, transom-hung balanced rudder that provides high-fidelity feedback and minimizes the physical effort required at the tiller, even when hard-pressed upwind.

According to a historical review in Sailing World, the early SM models were occasionally criticized for being underpowered in light air, which prompted the builder to increase the mast height for the remainder of the production run. However, in medium to heavy air, the SM configuration offers a lower center of effort and reduced heeling moment, making it a more manageable platform for short-handed sailors or those who sail in high-wind regions like the San Francisco Bay. The boat tracks with surprising sea-kindliness for its weight, though it performs best when sailed "flat," using the traveler to de-power the large mainsail rather than relying solely on the rudder.

Interior Comfort & Variations

Unlike many "stripped-out" MORC racers of the 1980s, the S2 9.1 SM benefits from Leon Slikkers’ insistence on high-quality interior finishes. The cabin provides a surprising amount of volume for a 30-foot boat, boasting nearly six feet of headroom and a warm aesthetic defined by extensive teak joinery and cabinetry. The layout is traditional yet functional, featuring a forward V-berth, a central salon with twin settees (one of which can convert to a double), and a dedicated navigation station.

Variations of the 9.1 include a shoal-draft version, which reduces the draft from the standard 5.5 feet to roughly 4.5 feet, though the deeper fin keel is preferred for its superior lift and upwind tracking. A later variant, the S2 9.1 SE, transitioned to a masthead rig, further diverging from the technical fractional setup of the original racing hulls. The interior of the 9.1 series is often cited for its "cruisability," with a galley that includes a two-burner stove and a deep sink, making it more than capable of extended weekend coastal cruising.

Known Issues & Buyer’s Checklist

Prospective buyers of an S2 9.1 SM must be diligent regarding structural maintenance, as these boats were built using high-performance but maintenance-intensive materials.

• Balsa Core Integrity: Unlike the cruising-oriented S2 9.2, the 9.1 racing models often featured balsa-cored hulls as well as cored decks. Moisture intrusion around stanchion bases, winches, and the cockpit floor is common and can lead to extensive delamination if the hardware was not regularly re-bedded.
• Mast Step & Floor: The original mast steps were often constructed with unsealed wood blocks that are prone to rot. Many owners have since replaced these with G10 or aluminum risers, but any boat with the original wood step should be inspected for compression and structural decay.
• Keel Stub Corrosion: The keel is attached to a mild steel plate glassed into the hull stub. If water has sat in the bilge for extended periods, this plate can corrode, causing "mushrooming" of the keel nuts or cracking in the fiberglass encapsulation.
• Mast Partners: The recessed gasket area where the mast passes through the deck is a known weak point. Owners frequently report leaks here that can migrate into the interior bulkheads if the specialized gasket is not maintained.

Community & Resources

The S2 9.1 remains supported by a dedicated group of enthusiasts and former racers. Technical documentation and class rules can often be found through the S2 9.1 Meter North American One Design Class Association. While the class is no longer as active on the national racing circuit as it was in the late 1980s, regional fleets—particularly in the Great Lakes and Pacific Northwest—continue to maintain technical wikis and historical databases for the model.

The Verdict

The S2 9.1 SM is a refined, high-quality racer-cruiser that offers a rare blend of "hot-rod" performance and a gentleman’s interior. While the short mast of the SM variant may lack the ultimate light-air potential of the tall-rig version, it provides a stable and forgiving platform for the performance-oriented cruiser.

Pros:

• Exceptional build quality and interior woodwork for a racing-designed hull.
• Highly balanced handling thanks to a well-engineered transom-hung rudder.
• Spacious 6-foot headroom and functional layout for weekend cruising.
• Slippery hull design that remains competitive in PHRF handicap racing.

Cons:

• Requires rigorous moisture monitoring due to extensive use of balsa coring.
• Structural mast step and keel plate issues require specialized inspection.
• The "SM" short rig can feel underpowered in regions with persistent light winds.