S2 7.9 FK Sailboat Review, Specs, and Listings

While the overwhelming majority of the production run featured a vertically retracting daggerboard to appeal to trailer-sailing racers, S2 developed a highly select, structurally pure alternative: the S2 7.9 FK (Fixed Keel). Introduced in 1979, the FK was engineered specifically for sailors who chose to keep their boats permanently slipped or moored, prioritizing hull stiffness, absolute structural simplicity, and a much cleaner, more open cabin layout. The interior reflects Slikkers’ signature quality, utilizing high-grade teak joinery, carefully fitted cabinetry, and a surprisingly spacious arrangement that easily eclipses its contemporary racing competitors.

Variations & Configurations

The S2 7.9 FK is defined by its dramatic structural departures from the standard lifting-keel model. On the standard 7.9, the ballast is split, carrying lead glassed directly into the hull bilges alongside a lead-weighted daggerboard. The Fixed Keel variant completely eliminates this internal ballast, placing its entire ballast weight of 1,550 pounds into a fixed, high-aspect external lead fin keel. By concentrating all the ballast lower in the water column, the design achieves equivalent righting moment and stiffness while dropping the overall displacement of the boat to 4,050 pounds—200 pounds lighter than its lifting-keel sibling.

Equally significant is the rig configuration. While the trailerable 7.9 features a highly adjustable fractional sloop rig, the FK variant is equipped with a powerful, tall masthead sloop rig. With an I-measurement of 34 feet and a J-measurement of 10 feet, the masthead layout supports massive overlapping headsails up to a 155-percent genoa. This distinct sail plan provides unparalleled upwind drive, especially in light-to-medium breezes, and simplifies sail-handling for short-handed crews who prefer the stability of a masthead configuration over the constant running backstay and mast-bend adjustments required on the fractional model. Both models draw 5.0 feet when fully immersed, but the FK's fixed fin keel cannot retract, eliminating trailering from standard boat ramps.

Sailing Performance & Handling

On the water, the S2 7.9 FK delivers an exhilarating, highly responsive sailing experience. With a Sail Area to Displacement ratio of 20.72, the masthead rig provides immediate acceleration in light air, allowing the boat to slip away from heavier cruising designs in drifting conditions. In moderate-to-heavy air, the hull's light-displacement characteristics are highlighted by a Displacement to Waterline Length ratio of 177.68. On a broad reach or run in 15 to 20 knots of breeze, the wide, flat-bottomed aft sections of the hull allow the S2 7.9 FK to break free of its theoretical hull speed and plane, frequently sustaining speeds between 8 and 12 knots.

The boat's handling characteristics are lively and highly communicative. Its Comfort Ratio of 14.61 means the motion is active and quick in a seaway, requiring an attentive helm and prompt sail trim adjustments in gusty conditions. With a Capsize Screening ratio of 2.26, the S2 7.9 FK relies heavily on its generous nine-foot beam for form stability. This hull form makes the boat incredibly stiff initially, but it is fundamentally designed as a high-performance coastal racer-cruiser and lake sailing platform rather than an offshore passagemaker. The transom-hung rudder provides exceptional authority, ensuring positive control even when hard-pressed downwind.

Market Snapshot & Economics

For prospective buyers, the S2 7.9 FK occupies a highly unique niche on the brokerage market. Out of approximately 545 hulls produced by S2 Yachts over the design's lifespan, only 17 units were delivered in the fixed-keel, masthead-rigged configuration. This extreme scarcity means that finding an FK on the market requires patience and diligence. When they do appear, they command a notable premium from purists who appreciate the combination of Graham & Schlageter performance with the hassle-free maintenance of a fixed keel.

Financially, the economics of owning an FK are highly attractive. By eliminating the complex winch, cable, and guide systems associated with a retractable daggerboard, owners avoid the common maintenance headaches of keel-trunk leaks, delamination, and mechanical failure. However, buyers must weigh these savings against the logistics of ownership. While many owners still keep these boats on custom dual-axle trailers, launching from a standard ramp is impossible; they must be hoisted by a crane or Travelift, and stepping the tall masthead rig is a multi-person job that typically requires a gin pole or marina assistance.

Known Issues & Triage

The primary technical concern for any vintage S2 model is the health of its end-grain balsa core. Both the hull and deck are cored, which keeps the boat light and rigid but leaves it highly vulnerable to water intrusion. Over decades, poorly sealed or neglected deck hardware—specifically the chainplates, stanchion bases, jib tracks, and companionway hatches—can allow water to seep into the core, causing localized rot and soft spots. Prospective buyers should thoroughly sound the deck with a plastic hammer and employ a moisture meter. Triage of wet core typically involves cutting away the inner or outer fiberglass skin, digging out the rotted balsa, and replacing it with synthetic materials like Coosa board or high-density foam before re-glassing.

Another critical area to inspect is the hull-to-deck joint. S2 utilized an inward-turning flange that was mechanically fastened with screws driven through the slotted aluminum toe rail rather than being through-bolted with backing plates. Over time, flexing of the hull during spirited racing can loosen these fasteners, allowing water to migrate through the screw threads and rot the core along the shear line. This issue is best triaged by systematically removing the toe rail, drying the joint, and re-fastening using thickened epoxy or a high-strength polyurethane adhesive like 3M 5200. Furthermore, because these boats are powered by transom-mounted outboard engines, the transom skin should be checked for stress cracking, which can occur if heavy four-stroke outboards are mounted without a robust internal backing plate to distribute the load.

Modernization & Upgrades

Modernizing an S2 7.9 FK is an excellent investment given the boat's enduring performance profile. Many owners focus their efforts on standing and running rigging. Replacing the original wire rigging with compacted-strand wire or high-performance Dyneema backstays, complete with a backstay flicker and upgraded multi-part purchase blocks, allows for much more precise control over headstay tension. Installing a modern, low-profile roller-furling system with an aluminum dual-track headfoil greatly improves headsail changes and short-handed usability without compromising the boat's upwind pointing ability.

On the electrical side, the minimalist factory 12-volt DC system is easily upgraded. Veteran owners often convert to a single LiFePO4 battery pack, which reduces weight and provides abundant power for modern wireless wind instruments, speed transducers, and LED navigation and interior lighting. For those looking to eliminate the weight and maintenance of a gasoline outboard, the S2 7.9 FK is a prime candidate for an electric outboard conversion. A 3-to-5-kilowatt electric pod or transom outboard powered by a small lithium bank easily handles harbor maneuvering and docking, aligning perfectly with the boat's light-displacement, clean sailing ethos.