Capricorn F18 Information, Review, Specs

Sailing Performance & Handling

The Capricorn F18 is defined by its exceptional light-to-moderate air performance and its revolutionary hull geometry. Unlike earlier F18 designs that featured more rounded, conventional bows, the Capricorn utilizes a "V" shaped entry and high-buoyancy sections forward. This design, pioneered by Martin Fischer, allows the boat to pierce through waves rather than riding over them, significantly reducing pitching—a phenomenon known in the multihull community as "hobby-horsing." This stability translates to higher average speeds in choppy conditions and a reduced tendency to pitch-pole when driving hard downwind under the large asymmetrical spinnaker.

The handling is sharp and responsive, typical of a high-end racing catamaran. With a standard F18 weight of approximately 180kg and a generous sail area, the power-to-weight ratio is high, requiring active use of the twin trapezes for the helm and crew to keep the platform level. Owners often note that the Capricorn feels particularly "lively" compared to its contemporaries like the early Hobie Tiger or Nacra Infusion. According to the International F18 Class Association, the class rules allow for a variety of mast and sail combinations, but the Capricorn was optimized for the rigors of international competition, featuring a stiff, high-modulus mast section that allows for precise control over sail shape and forestay tension.

Sibling Models & Evolution

The Capricorn was not a standalone effort but part of a lineage of high-performance hulls developed by Martin Fischer and XSP. Its most direct successor is the C2, which refined the Capricorn’s wave-piercing concept with even more volume in the bows and a revised deck layout to further centralize weight. While the Capricorn laid the groundwork, the C2 was designed to address the Capricorn's few weaknesses, specifically improving its performance in extreme heavy-air conditions where the original hull could occasionally become "trippy" if not handled with precision.

Additionally, XSP utilized the lessons learned from the Capricorn’s carbon-reinforced fiberglass construction to support other racing classes. While not "siblings" in terms of hull shape, the manufacturing techniques used for the Capricorn influenced XSP's production of the 29er and 420, ensuring that the racing dinghies met the same rigorous weight and stiffness tolerances required by the F18 class.

Known Issues & Buyer’s Checklist

When evaluating a used Capricorn F18, buyers should focus on the structural integrity of the hulls and the condition of the racing hardware, as these boats are often sailed at their physical limits.

• Hull Stiffness and Soft Spots: Like many foam-sandwich performance boats, the decks and hull sides can develop "soft spots" over time, particularly in high-traffic areas or near the crossbeam attachments. Press firmly across the decks to check for any delamination or excessive flexing.
• Daggerboard Trunks: The high loads generated by the deep daggerboards can cause wear or cracking at the trunk exits. Inspect the areas where the trunks meet the hull for signs of stress or spiderweb cracking in the gelcoat.
• Crossbeam Bolt Holes: The connection points between the aluminum crossbeams and the fiberglass hulls are critical. Check for elongated bolt holes or signs of movement, which can lead to a "loose" platform and reduced pointing ability.
• Rigging Fatigue: Given the high tension of an F18 rig, the standing rigging and chainplates should be inspected for "meat hooks" or hairline fractures. The mast base and the area around the rotation limiter are also prone to wear.
• Rudder System Play: The Capricorn uses a sophisticated kick-up rudder system. Ensure the kick-up mechanism operates smoothly and that there is no excessive play in the pintles or gudgeons, which can degrade steering precision.

Community & Resources

The primary resource for Capricorn owners is the International F18 Class Association, which maintains the class rules and coordinates a robust global racing calendar. Because the Capricorn remains a competitive—albeit older—platform for club racing and regional regattas, many technical tips can be found through national F18 chapters. In Australia and Singapore, the Xtreme Sailing Products office at the National Sailing Centre continues to be a point of contact for parts and technical support, though many components (such as sails and blocks) are standardized across the F18 fleet.

The Verdict

The Capricorn F18 is a landmark design that remains a viable and exhilarating option for sailors looking to enter the high-performance catamaran scene without the price tag of a brand-new foiling boat.

Pros:

• Revolutionary Design: One of the most influential hull shapes in modern catamaran history.
• Light Air Prowess: Exceptionally fast in light to moderate conditions due to its narrow waterline.
• Class Legal: Fully compliant with F18 rules, ensuring access to one of the world's most active racing fleets.
• Build Quality: XSP's manufacturing provides a stiff, durable platform that has aged better than many of its contemporaries.

Cons:

• Heavy Air Sensitivity: Requires a skilled hand in high winds compared to high-volume modern successors like the C2 or Akurra.
• Complex Rigging: The sheer number of control lines and high-tension systems may be overwhelming for novices.
• Ageing Fleet: Most Capricorns on the market are over 15 years old, necessitating a thorough survey of the core and foils.