Koala 50 Information, Review, Specs

Sailing Performance & Handling

The Koala 50 is characterized by its significant displacement and a hull form designed for directional stability. Most iterations of the yacht utilize a ketch or schooner rig, a choice that allows for a highly versatile sail plan, making it easier for a short-handed crew to balance the boat as wind speeds increase. In its sailing reports, the French publication Voiles et Voiliers has historically noted that while the vessel may feel sluggish in light airs (under 10 knots), it transforms into a powerful, steady platform once the breeze fills in.

The hull typically features a moderate-to-deep draft and a longish fin keel, which contributes to its "sea-kindliness"—the ability to maintain a comfortable motion in a confused sea state. The high Sail Area to Displacement (SA/Disp) ratio is balanced by the split rig, allowing sailors to drop the mainsail and continue under jib and mizzen in heavy weather, maintaining a balanced helm with minimal autopilot strain. Tracking is exceptional, a hallmark of Bigoin’s designs, which often focused on the boat's ability to "self-steer" through careful hull balancing.

Interior Comfort & Variations

Below deck, the Koala 50 offers the voluminous interior common to French blue-water designs of its era. The layout is typically centered around a large raised saloon that provides excellent visibility and light, a precursor to the modern deck saloon concept. The use of high-quality hardwoods, often teak or mahogany, creates a traditional maritime ambiance that contrasts with the minimalist interiors of modern yachts.

The vessel was produced in several variations to accommodate different cruising styles. The most common configuration features a large owner’s cabin aft with an ensuite head and a dedicated navigation station, while the forward sections offer guest cabins in either V-berth or bunk configurations. A rare "charter" variant was also produced, which prioritized additional berths at the expense of storage. Because many were finished as semi-custom builds, the quality of the joinery and the specific galley layout can vary significantly between hulls. Sibling models, such as the Koala 44, offer a similar aesthetic and hull profile but lack the expansive engine room access and storage capacity that make the 50-footer a true "liveaboard" candidate.

Known Issues & Buyer’s Checklist

Prospective buyers of a Koala 50 must conduct a rigorous assessment of the hull material. For aluminum versions, electrolysis and galvanic corrosion are the primary concerns. It is essential to inspect the integrity of the sacrificial anodes and look for signs of "pitting" around the waterline and through-hull fittings. In GRP versions, while osmosis is less common due to the thick hand-laid laminates used by Technisul, the deck core—often balsa or foam—should be checked for moisture ingress, particularly around the chainplates and stanchion bases.

The complex plumbing and electrical systems required for a boat of this size also demand scrutiny. Many Koala 50s were equipped with large capacity water-makers and generators from the factory; if these are original, they likely require total replacement. Additionally, the standing rigging on the ketch or schooner masts is more extensive than a standard sloop, significantly increasing the cost of a decade-overdue refit. Buyers should also verify the condition of the rudder bearings and the steering quadrant, as these are high-load areas on a boat of this displacement.

Community & Resources

While there is no single international owner's association dedicated exclusively to the Koala 50, the yacht is a frequent topic of discussion within French blue-water cruising forums. Technical data and historical context are often preserved by the Association des Propriétaires de Bateaux en Aluminium (Aluminum Boat Owners Association) in Europe, which tracks many of Bigoin’s metal-hulled designs. Detailed architectural plans are sometimes available through French maritime archives, given the historical significance of the Bigoin and Givon partnership in the development of French yachting.

The Verdict

The Koala 50 remains a formidable choice for the serious offshore sailor who values "heft" and history over modern sleekness. It is a boat that rewards patience and maintenance with unmatched safety at sea.

Pros:

• Exceptional Stability: Heavily built with a sea-kindly motion in heavy weather.
• Versatile Sail Plan: The ketch/schooner rig allows for easy sail handling in varying conditions.
• Massive Interior Volume: Ideal for long-term liveaboard use or extended family cruising.
• Design Pedigree: Created by world-class naval architects known for ocean-racing success.

Cons:

• Light-Air Performance: Requires a significant breeze to overcome its displacement.
• Maintenance Intensity: Complex systems and (if aluminum) corrosion risks require diligent upkeep.
• Refit Costs: The large size and split rig increase the price of essential upgrades like sails and rigging.