What immediately sets the Comet 31 S apart from its competitors is how it maximizes its dimensions. Though the hull length is a modest 9.74 meters (approximately 31.95 feet), the inclusion of an integrated composite bowsprit, or "delfiniera," extends the total length overall to 34.25 feet. This clever architectural feature allows the boat to carry an aggressive sail plan while completely concealing the anchor and windlass setup below the foredeck line. In an era where many production builders were producing conservative, heavy cruisers, the Comet 31 S emerged as a sleek, Italian-styled performance cruiser that refused to compromise on interior comfort or build quality.
Design Brief & Layout Options
The layout of the Comet 31 S was engineered to provide a sense of luxury and space that defies its 31-foot class. By carrying a generous beam of 11.42 feet well aft, Sergio Lupoli and the interior design team created a cabin that feels remarkably open and airy. Standing headroom reaches a full 1.90 meters (6.23 feet) in the main saloon, a rare feat for a boat of this length. The interior layout is clean and modern, characterized by light, textured wall panels and simple joinery in white-washed oak or cherry. Large deck-saloon-style windows flood the saloon with natural light, creating a bright, welcoming environment.
Accommodations are configured to comfortably sleep a family of four, with the capability to host six when utilizing the saloon settee berths. The forward cabin features a V-berth with an impressive overhead height, while the aft cabin boasts a remarkably wide double berth that extends under the cockpit. The L-shaped galley is functional and well-proportioned, situated opposite a surprisingly large head compartment that includes a dedicated wet locker for foul weather gear. Cruisers will appreciate the 170-liter fresh water capacity, which is ample for extended coastal island-hopping. On deck, the cockpit is the clear focal point, featuring long, ergonomic benches that double as comfortable sun loungers, and coamings designed to keep the crew secure whether cruising or hiking out during a race.
Structural Architecture & Build Quality
Unlike mass-production yachts that rely on heavy, solid-fiberglass layups and superficial internal liners, the Comet 31 S was constructed utilizing advanced composite techniques. The hull and deck are built using a vacuum infusion process, utilizing a double-skin fiberglass sandwich post-cured at 70 degrees Celsius. This vacuum casting process ensures a highly optimized resin-to-glass ratio, resulting in a lightweight, stiff, and exceptionally durable structure.
To handle the sailing loads generated by its powerful rig, Comar Yachts laminated a comprehensive internal structural grid, known in Italian yachting as the "ragno del fondo" or bottom spider, directly to the hull while it was still in the mold. Rather than simply gluing in a pre-molded fiberglass liner, every bulkhead, stringer, and load-bearing framework in the Comet 31 S is chemically and structurally bonded to the hull. This creates a monolithic, ultra-rigid unit that eliminates structural flexing under load. Another notable build decision was the choice of a traditional shaft drive for the 20 HP inboard diesel engine. While sail drives are the industry standard for this size class, Comar’s commitment to a traditional shaft line reduces long-term maintenance complexities associated with sail drive rubber diaphragms, though it does require careful alignment of the shaft.
Sailing Performance & Handling
On the water, the performance characteristics of the Comet 31 S are defined by its low displacement of 8,598 pounds and a highly potent sail plan. Interpreting the design’s key ratios reveals a boat that is lively, fast, and exceptionally rewarding in light to moderate air. With a sail area-to-displacement ratio of 23.37, the yacht is highly powered. Under its standard fractional sloop rig with a square-top mainsail of 32.80 square meters and a 108 percent overlapping genoa, the Comet 31 S accelerates instantly in light breezes and quickly reaches its theoretical hull speed of 7.6 knots. Downwind, the integrated bowsprit allows the crew to easily fly a massive 85-square-meter gennaker, transforming the boat into a thrilling, stable downwind plane.
The displacement-to-length ratio of 117.69 places the design firmly in the light-displacement category. This light displacement, combined with a comfort ratio of 15.89, means the motion in a seaway is rapid and active. It is not a heavy, momentum-driven ocean-plodder; instead, it is an agile performer that relies on active helm and sail trim. With a ballast-to-displacement ratio of 27.95 percent, the raw ballast weight is relatively low, but Comar compensated for this by utilizing a deep 1.90-meter (6.23-foot) T-bulb fin keel. This positions the ballast at the maximum possible depth, drastically lowering the center of gravity and providing excellent righting moment. However, with a capsize screening ratio of 2.23, the boat is primarily designed as a Category B fast coastal cruiser and club racer; it would not be the first choice for grueling offshore ocean crossings.
Maintenance, Triage & Owner Upgrades
While the vacuum-infused hull of the Comet 31 S is largely immune to the structural issues that plague older hand-laid boats, there are several areas that require targeted maintenance and triage. The Lombardini 20 HP inboard diesel engine, while reliable and simple to service, is known to produce slightly higher vibration and noise levels than equivalent Volvo Penta or Yanmar units. Many veteran owners have successfully mitigated this by retrofitting the engine compartment with high-density, multi-layer acoustic insulation. Additionally, because the engine utilizes a traditional shaft drive rather than a sail drive, checking the shaft alignment and the condition of the drip-less shaft seal is an essential part of the annual maintenance routine.
On deck, the aggressive square-top mainsail exerts tremendous upward force on the main halyard. Owners frequently report that the standard deck clutches can slip under high loads, leading to a loss of luff tension. Upgrading the main halyard clutch to a high-load ceramic-jaw clutch is a common and highly recommended modernization. Structurally, the integrated composite bowsprit must be regularly inspected for localized stress cracking around the anchor roller mount, as a loose or improperly stowed anchor can bang against the interior of the bowsprit pocket and damage the laminate. Finally, the white-washed oak interior woodwork is sensitive to prolonged UV exposure; installing custom exterior covers for the large deck saloon windows when the boat is idle will prevent discoloration of the joinery.
Market Snapshot & Economics
On the brokerage market, the Comet 31 S commands a relative premium compared to standard, mass-produced yachts of its era, reflecting its high-tech build method and semi-custom Italian heritage. Because Comar Yachts focused heavily on multihull construction in later years, the Comet 31 S was produced in relatively modest numbers, making it a rare find on the secondhand market, particularly outside of the Mediterranean and Northern Europe.
Prospective buyers should take care to distinguish a genuine Comar-built Comet 31 S from the Polish-built Viko 30S. While Viko Yachts utilized the Comet 31 hull mold under license, they modified the deck and interior to suit a much lower, budget-oriented price point. The original Comet 31 S remains the far superior vessel, utilizing premium vacuum-infused laminates, high-grade Harken deck gear, and a fully finished, structural interior, whereas the Viko variant often relied on simpler, heavier hand-laid fiberglass and more basic interior materials. For a discerning sailor, investing in a well-maintained Comet 31 S represents excellent value, as the boat’s advanced construction and timeless Sergio Lupoli lines ensure it holds its value exceptionally well.
The Verdict
The Comet 31 S is a masterclass in modern, small-cruiser design, offering an intoxicating blend of Italian style, high-tech composite construction, and genuinely thrilling sailing performance. It is a boat that refuses to feel small, providing the standing headroom, interior light, and accommodation volume of a 34-foot cruiser, while maintaining the light-air agility and helm response of a sportboat. While its light displacement and active motion in a seaway mean it is not suited for grueling blue-water crossings, it excels as a high-speed coastal cruiser and a highly competitive club racer.
Pros:
- Exceptional light-air acceleration and fast downwind performance under gennaker.
- Innovative integrated bowsprit that completely conceals the anchor setup.
- Remarkable interior volume with 1.90 meters of standing headroom.
- Superior vacuum-infused, post-cured laminate with a structurally integrated bottom grid.
- Low-maintenance traditional shaft drive simplifies long-term ownership.
Cons:
- Active, lively motion in a seaway is less comfortable than heavier cruisers.
- Deep 1.90-meter draft restricts access to shallow harbors and anchorages.
- Standard Lombardini diesel engine produces noticeable noise and vibration.
- White-washed oak interior joinery is susceptible to UV-induced yellowing.
- High-aspect rudder requires positive speed to prevent drift during slow tacks.
