The Bi-Loup 9, produced by the French shipyard Wrighton Yachts, represents a quintessential example of the "biquille" or twin-keel philosophy that has defined the builder's legacy since the late 1970s. Measuring approximately 9 meters (29.5 feet) in length, this model was designed to bridge the gap between the smaller coastal cruisers and the more substantial blue-water yachts in the Wrighton catalog. The vessel is characterized by its exceptionally generous beam-to-length ratio, which creates a stable and voluminous platform. This design choice is particularly well-suited for family cruising in tidal waters, such as those found along the coast of Brittany or the English Channel, where the ability to "beach" the boat on its own keels during low tide is a significant operational advantage.
Bi-Loup 9 Information, Review, Specs

- Make
- Bi-Loup
- Model
- 9
- Builder
- Wrighton Yachts
- Designer
- Richard Wrighton
- Number Built
- 30
- Production Year(s)
- 1979 - 1988
Sailing Performance & Handling
The sailing characteristics of the Bi-Loup 9 are dictated by its twin-keel configuration and a relatively high displacement-to-length ratio. Unlike traditional fin-keel yachts, the Bi-Loup 9 utilizes two shallow keels that allow it to stand upright on the sand or mud when the tide recedes. This setup naturally increases the wetted surface area, which can result in a slight performance penalty in light winds and a wider tacking angle when sailing upwind compared to deep-keeled competitors. However, the design offers remarkable initial stability; the boat remains stiff even as the breeze freshens, providing a sense of security for less experienced crews.
Handling is assisted by a balanced rudder system—often a single deep spade or twin rudders depending on the specific production year—which maintains control even when the boat is healed. Owners frequently report that while the Bi-Loup 9 is not a racing yacht, it tracks well and manages heavy chop with a "seakindly" motion, avoiding the jarring slams common in flatter-bottomed modern hulls. The sail plan is typically masthead-rigged with a focus on ease of reefing, making it a predictable and forgiving vessel for shorthanded sailing.
Interior Comfort & Variations
The interior of the Bi-Loup 9 is where Wrighton Yachts truly innovated, maximizing the hull's 3.3-meter beam to create a living space that feels significantly larger than its 29-foot designation suggests. The layout often features a "panoramic" saloon, a design element that predated the modern deck-saloon trend. This provides ample natural light and allows those seated at the dinette to see out of the coachroof windows, a rare luxury in boats of this era.
The standard configuration includes two dedicated cabins—a V-berth forward and a large double cabin tucked under the cockpit—providing privacy for two couples or a family. The sibling models, such as the Bi-Loup 90 (a direct evolution of the 9) and the Bi-Loup 30, share this focus on volume but often vary in their galley arrangements and wood finishes. While early versions of the Bi-Loup 9 utilized darker teak veneers, later iterations and the Bi-Loup 90 often moved toward lighter oak or ash to enhance the sense of space. The Association Bi-Loup provides extensive technical documentation on these interior variations, highlighting how the shipyard adapted the layout to accommodate more modern appliances and increased water storage for longer cruises.
Known Issues & Buyer’s Checklist
Prospective buyers of a Bi-Loup 9 should focus their inspections on the unique structural requirements of a twin-keel vessel. Because these boats are designed to be frequently dried out, the keel-to-hull joints undergo significant stress cycles.
- Keel Reinforcements: Inspect the internal hull grid and floors around the keel bolts for signs of stress cracking or "spidering," which can occur if the boat has been set down hard on uneven ground.
- Window Leaks: The large, iconic coachroof windows are a known weak point. Over time, UV degradation of the sealant can lead to leaks that damage the interior woodwork.
- Rudder Bearings: In models equipped with twin rudders, check for play in the linkage and bearings. The complexity of the steering system in these configurations can lead to a "loose" feeling at the helm if not maintained.
- Osmosis: As with many European production boats of the 1990s, the hull should be checked for osmotic blistering, particularly if the boat has spent its life in warmer waters or has not been hauled out annually.
Community & Resources
The Bi-Loup 9 benefits from a highly active and dedicated owner community, primarily centered in France but extending throughout Europe. The most prominent resource is the Association des Propriétaires de Bi-Loup, which maintains a technical wiki and hosts annual rallies. This organization is the primary repository for original manufacturer brochures and wiring diagrams that are otherwise difficult to source.
The Verdict
The Bi-Loup 9 is a specialist cruiser that excels in niche environments where draft is a constraint and comfort is a priority. It is an ideal choice for coastal explorers who value the freedom of tidal moorings over the adrenaline of regatta racing.
Pros:
- Beachable: The twin-keel design allows for "drying out," saving on marina fees and enabling unique anchoring locations.
- Exceptional Volume: The interior space and "panoramic" views are superior to most 30-footers of the same vintage.
- Stability: A very stiff boat that provides a safe platform for family cruising and nervous sailors.
Cons:
- Upwind Performance: The twin-keel drag and shallow draft limit its ability to point high into the wind.
- Wetted Surface: Slower than fin-keel counterparts in light air.
- Aesthetic: The high-volume coachroof and "boxy" proportions may not appeal to traditionalists seeking sleek lines.
Measurements
Construction & Hull
- Construction Material
- Fiberglass
- Hull Type
- Monohull Sailboat
- Keel Type
- Twin
- Rudder
- 1x —
- Ballast
- 2094 lbs
- Displacement
- 6173 lbs
- Water Capacity
- -
- Fuel Capacity
- -
Dimensions
- Length Overall (LOA)
- 29.53 ft
- Waterline Length (LWL)
- 26.57 ft
- Beam
- 9.84 ft
- Draft
- 2.95 ft
- Max Headroom
- -
- Air Draft
- -
Rig & Sails
- Rig Type
- Masthead Sloop
- P (Main Luff)
- -
- E (Main Foot)
- -
- I (Foretriangle Height)
- -
- J (Foretriangle Base)
- -
- Forestay Length (est)
- -
- Sail Area
- 279 sqft
Calculations
- Sail Area / Displacement (SA/D) Ratio
- 13.26
- Ballast / Displacement Ratio
- 33.92
- Displacement / Length Ratio (D/L) Ratio
- 146.92
- Comfort Ratio
- 16.53
- Capsize Screening Formula
- 2.15
- Hull Speed
- 6.91 kn