Chatam 33 Information, Review, Specs

Sailing Performance & Handling

Under sail, the Chatam 33 is characterized by its stability and sea-kindliness rather than raw speed. The boat’s performance is heavily influenced by its configuration—most notably whether it features a fixed fin keel or the more popular "dériveur intégral" (swing keel) system. The swing-keel variant is particularly prized for its ability to reduce draft to approximately 0.70 meters, allowing for gunkholing in shallow waters and even intentional beaching on its flat-bottomed hull.

With a displacement-to-length ratio that often hovers in the moderate-to-heavy range (approximately 6,200 kg for its size), it is not a "light racer" but rather a momentum-driven cruiser. The multi-chine hull provides excellent initial stability, and the high ballast ratio (typically around 41%) ensures it remains stiff when the wind picks up. According to technical data from Boatsector, the boat often carries a masthead sloop rig with a sail area of roughly 62 square meters (667 sq. ft.), providing a balanced power-to-weight ratio that handles heavy weather with composure. Tracking is generally reliable, though the dual-rudder configuration found on some versions is noted for maintaining control even at significant heeling angles.

Interior Comfort & Variations

The "spacy" nature of the Chatam 33 is a hallmark of the Caroff design philosophy. By utilizing a wide beam (3.45m) and carrying that volume through a chined hull, the interior feels significantly larger than contemporary fiberglass yachts of the same length. One of its most impressive technical specifications is the headroom, which often reaches 2.0 meters (6.56 ft) in the main salon, a rarity for a 33-footer.

Because many Chatam 33s were owner-finished or custom-built, the interior variations are vast. A standard layout typically includes two private cabins—a V-berth forward and a large double cabin aft—along with a functional galley and a proper navigation station. The "Extreme" sibling variants or later iterations often featured refined joinery, whereas earlier "Classic" models might reflect the utilitarian aesthetic of their amateur builders. The use of metal construction also necessitates robust insulation to manage condensation and temperature, a feature that buyers should verify, as it varies significantly between individual hulls.

Popular Mentions & Media

The Chatam series holds a storied place in the history of modern expedition sailing. Perhaps its most significant "media" legacy is its influence on the founders of high-end boat builders. Jean-François Delvoye, the founder of Boréal Yachts, famously built and sailed a Caroff-designed Chatam with his family to South Georgia and Patagonia, a voyage documented by Attainable Adventure Cruising as the catalyst for the development of his own world-class aluminum expedition boats. This pedigree reinforces the Chatam 33’s reputation as a legitimate gateway into high-latitude exploration.

Known Issues & Buyer’s Checklist

Prospective owners must approach a Chatam 33 with a specialized checklist tailored to metal construction and amateur build quality.

• Galvanic Corrosion & Electrolysis: Especially for aluminum models, a thorough check of the hull’s electrical isolation and the condition of sacrificial anodes is mandatory.
• Internal Rust (Steel Models): In steel hulls, the most dangerous corrosion often happens from the inside out. Inspect areas where standing water can collect, such as beneath the water tanks or in the bilge pockets, where inadequate paint coating can lead to pitting.
• Weld Integrity: Since many of these boats were built by private individuals, the quality of the welds should be scrutinized by an ultrasonic thickness test to ensure no thinning has occurred in the plate.
• Insulation Gaps: Check for "sweating" behind cabinetry. Poorly applied insulation can lead to moisture trapping against the hull, which is the primary cause of rust spots in otherwise well-maintained steel boats.
• Swing Keel Mechanism: On "dériveur" models, the pivot pin and lifting cable system are wear items that require periodic replacement and can be difficult to access without specialized equipment.

Community & Resources

The Chatam 33 benefits from a dedicated following, particularly in French-speaking sailing communities. The most prominent resource for technical support and original design intent is the Gilbert Caroff-Duflos Architecture Navale office, which continues to provide plans and consulting for the Chatam range. Technical discussions are frequently found on the SailNet Community and various French "autofabrication" forums, where owners share maintenance tips specific to the multi-chine hull geometry.

The Verdict

The Chatam 33 is an uncompromising tool for the sailor who prioritizes structural safety and global reach over marina-friendly aesthetics. It is a boat that rewards a hands-on owner who understands the nuances of metal hull maintenance.

Pros

• Exceptional Durability: Metal construction (steel or aluminum) offers unmatched impact resistance compared to GRP.
• Shallow Water Access: The swing-keel version allows for exploration of estuaries and shallow anchorages.
• Interior Volume: Massive headroom and a wide, airy cabin make it a viable full-time liveaboard.
• Pedigree: Designed by a master of metal boat building with a proven track record in high latitudes.

Cons

• Maintenance Intensity: Requires constant vigilance against corrosion and paint system degradation.
• Build Variability: Wide quality gaps between professionally finished and amateur-built examples.
• Weight: Heavier than fiberglass counterparts, requiring more wind to reach hull speed.