The Mikado 56 stands as the flagship of the Constructions Nautiques du Sud-Ouest (CNSO) shipyard, representing the high-water mark of the builder’s output before it ceased operations in 1982. Designed by the prolific Michel Bigoin—the naval architect also responsible for the shipyard’s successful Karate and Shogun lines—the Mikado 56 was conceived as a robust, long-range bluewater cruiser. At 17 meters, it was a massive undertaking for a yard traditionally known for mid-sized family cruisers. It was built during an era when French yacht design was transitioning from traditional heavy-displacement forms to more modern, voluminous hulls, resulting in a vessel that prioritizes sea-kindliness and interior capacity over raw racing speed.
Fra Mikado 56 Information, Review, Specs

- Make
- Fra
- Model
- Mikado 56
- Builder
- Constructions Nautiques du Sud-Ouest
- Designer
- Michel Bigoin
- Number Built
- Production Year(s)
- 1976 - 1984
Sailing Performance & Handling
Under sail, the Mikado 56 is a quintessential heavy-displacement ketch. With a hull length of approximately 56 feet and a substantial beam, the boat possesses significant inertia, which translates to a stable and predictable motion in a seaway. Unlike the lighter, more nimble designs coming out of France in the late 1970s, the Mikado 56 is designed to "plow" rather than "surf," making it a fatigue-reducing platform for long-distance passage making.
The ketch rig is the defining feature of its handling characteristics. This configuration allows for a versatile sail plan, enabling the crew to maintain balance by using the "mizzen and jib" combination in high winds, which keeps the center of effort low and manageable. While its high displacement and relatively conservative sail-area-to-displacement ratio mean it is not a stellar performer in light airs, it excels when the breeze freshens. Owners often report that the boat tracks exceptionally well on a reach, though like many long-keeled or deep-finned yachts of its displacement, it can be somewhat sluggish in stays during a tack. The steering is generally described as heavy but reliable, providing the helmsperson with a clear sense of the forces acting upon the rudder.
Interior Comfort & Variations
The interior of the Mikado 56 was designed to compete with the luxury cruisers of the time, such as those from Amel or Henri Wauquiez. The sheer volume of the hull allowed CNSO to offer several layout variations, most notably a four-cabin or even five-cabin configuration, which made the boat a popular choice for the Mediterranean charter trade and large families.
The primary sibling model is the Mikado 52, which utilizes a very similar hull form but with a shorter overall length. The 56-foot version typically utilizes the extra length to expand the aft owner’s stateroom and the cockpit area. Inside, the joinery is characteristic of the 1970s French style, utilizing deep-toned mahogany or teak veneers. The main salon is expansive, often featuring a large U-shaped settee and a dedicated navigation station that reflects its bluewater ambitions. Headroom is generous throughout the vessel, rarely dropping below 6'4", which contributes to an airy, open feel that was advanced for its era.
Known Issues & Buyer’s Checklist
Purchasing a Mikado 56 today requires a rigorous inspection of its structural and mechanical systems, as these vessels are now entering their fifth decade of service.
- Osmosis and Hull Integrity: Like many GRP (Glass Reinforced Plastic) hulls produced in the Lot-et-Garonne region during the late 70s, the Mikado 56 is prone to osmotic blistering. A thorough moisture meter test and a visual inspection of the hull below the waterline are essential.
- Chainplates and Rigging: The ketch rig doubles the amount of standing rigging compared to a sloop. Buyers should closely inspect the chainplates, which are often glassed into the hull structures. Over time, leaks at the deck level can lead to crevice corrosion in the stainless steel components.
- Deck Core Condition: CNSO utilized sandwich construction for the decks to save weight. Prospective buyers should check for soft spots or "delamination" around high-load areas like the windlass, stanchion bases, and the bases of both masts.
- Engine and Systems: Many Mikados were originally fitted with Perkins or Volvo Penta engines. Given the boat's displacement, these engines work hard. Service records for the cooling system and the state of the fuel tanks—which can be difficult to remove if they have corroded—are critical checklist items.
Community & Resources
The primary hub for technical knowledge regarding these vessels is the Club des Amis Propriétaires de Karaté, which, despite its name, serves as a broader repository for owners of all CNSO-built yachts, including the Mikado and Shogun series. This community is largely French-speaking but remains the most authoritative source for original blueprints and structural advice.
The Verdict
The Mikado 56 remains a formidable choice for sailors who prioritize safety and living space over contemporary styling and light-wind performance. It is a "ship-like" yacht that rewards those who value a steady motion at sea.
Pros:
- Exceptional interior volume and headroom, ideal for live-aboards.
- The ketch rig offers versatile and safe sail handling for shorthanded crews.
- Heavy displacement provides a comfortable motion in rough offshore conditions.
- Designed by Michel Bigoin, ensuring sound naval architecture and structural logic.
Cons:
- High maintenance costs associated with two masts and aging systems.
- Performance is lackluster in light winds and when sailing close-hauled.
- High probability of requiring an osmosis treatment if not already performed.
- Large dimensions make it expensive to dock in modern, crowded marinas.
Measurements
Construction & Hull
- Construction Material
- Fiberglass
- Hull Type
- Monohull Sailboat
- Keel Type
- Fin
- Rudder
- 1x —
- Ballast
- 22046 lbs
- Displacement
- 52910 lbs
- Water Capacity
- 280 gal
- Fuel Capacity
- 132 gal
Dimensions
- Length Overall (LOA)
- 56.59 ft
- Waterline Length (LWL)
- 46.21 ft
- Beam
- 15.75 ft
- Draft
- 6.56 ft
- Max Headroom
- -
- Air Draft
- -
Rig & Sails
- Rig Type
- Ketch
- P (Main Luff)
- -
- E (Main Foot)
- -
- I (Foretriangle Height)
- -
- J (Foretriangle Base)
- -
- Forestay Length (est)
- -
- Sail Area
- -
Calculations
- Sail Area / Displacement (SA/D) Ratio
- —
- Ballast / Displacement Ratio
- 41.67
- Displacement / Length Ratio (D/L) Ratio
- 239.38
- Comfort Ratio
- 42.19
- Capsize Screening Formula
- 1.68
- Hull Speed
- 9.11 kn