Extreme 40 Information, Review, Specs

Sailing Performance & Handling

Sailing an Extreme 40 is an exercise in managing immense power-to-weight ratios. Weighing only approximately 1,250 kg (2,755 lbs) while carrying a massive square-top mainsail and a powerful gennaker, the boat is capable of reaching speeds in excess of 30 knots. Unlike modern foiling catamarans that followed it, the Extreme 40 is a displacement hull design, meaning it relies on its long, slender hulls for stability and speed. According to performance data and technical overviews from Marstrom, the use of autoclaved carbon fiber ensures that the hulls remain extremely stiff under the high rig loads required to fly the windward hull in as little as 8 knots of breeze.

Handling is notoriously physical and requires precise coordination. The boat features a dual-steering station setup, allowing the helmsman a clear view of the sails and the competition. In stadium racing environments, the Extreme 40 is known for its "twitchy" nature; it accelerates and decelerates almost instantly. A critical aspect of its handling is managing the "pitch-pole" risk; with so much sail area and relatively narrow hulls, the bow can easily bury in a gust. Professional sailors often describe the handling as visceral, as the lack of any hydraulic assistance means every adjustment to the traveler or mainsheet is felt directly by the crew.

Popular Mentions & Media

The Extreme 40’s primary claim to fame is its role as the foundation of the Extreme Sailing Series. This global circuit transformed professional sailing by moving races from offshore courses to harbor-fronts in cities like Muscat, Singapore, and Cardiff. The boat was specifically designed with a "Fifth Man" spot, allowing a guest or VIP to sit on the trampoline during a live race—a revolutionary move for sports marketing. The class served as a proving ground for some of the world’s elite sailors, including Sir Ben Ainslie and Franck Cammas. The dramatic visuals of these 40-foot giants capsizing in tight quarters were frequently captured in high-definition broadcasts, making the Extreme 40 one of the most photographed racing yachts of the early 21st century.

Known Issues & Buyer’s Checklist

Because the Extreme 40 was built for professional circuit racing, any vessel on the secondary market has likely been pushed to its structural limits. Prospective owners or racing syndicates should focus on the following high-signal areas:

• Carbon Delamination and Fatigue: The hulls are built with a Nomex honeycomb core which can be susceptible to "crush" or delamination if the boat has suffered collisions (common in stadium racing) or if the core has been compromised by moisture. A professional tap-test or thermal imaging of the hull-to-deck joins and beam-attachment points is essential.
• Beam Bolt-Down Points: The Extreme 40 is designed to be dismantled for shipping in standard 40-foot containers. The areas where the crossbeams bolt into the hulls are under immense stress. Inspect these areas for spiderweb cracking in the gelcoat or signs of "working" in the carbon laminate.
• Rigging and Spars: Marstrom is world-renowned for their carbon masts, but the Extreme 40 rig is under constant high tension. Check the mast step and the hounds for any signs of hairline fractures or compression damage.
• Trampoline and Hardware: The trampolines are a safety-critical component. Check for UV degradation and the integrity of the lacing eyes. Similarly, the high-load winches and blocks should be inspected for bearing wear, as the loads on an Extreme 40 can quickly chew through standard hardware.

Community & Resources

The primary authority for the technical specifications and build standards remains Marstrom Composite AB. While the official "Extreme 40 Class Association" has become less active since the professional circuit transitioned to the foiling GC32, the class is still supported by the original developers at TornadoSport. Technical documentation and spare parts information are often managed through the builder's legacy support channels.

The Verdict

The Extreme 40 is a legendary racing machine that bridged the gap between traditional multihulls and the foiling era. It remains a pinnacle of composite engineering and offers a level of raw speed that few other 40-footers can match.

Pros:

• Exceptional Build Quality: Marstrom’s autoclaved carbon construction is among the best in the marine industry.
• Raw Speed: Capable of outrunning almost anything in its size class, especially in light to moderate air.
• Logistics: The ability to dismantle and containerize the boat makes it more mobile than most 40-foot catamarans.

Cons:

• High Maintenance: Requires a professional or highly skilled shore team to maintain the complex rigging and carbon structures.
• Unforgiving: The high power-to-weight ratio makes it prone to capsizing or pitch-poling if handled by an inexperienced crew.
• Specialized Use: With no interior and an open deck, it is strictly a racing machine with no utility for cruising or overnighting.