Design Brief & Intent
The core philosophy of the Bi-Loup 36 is built around freedom of movement and anchoring independence. While standard fin-keel sailboats are bound to deep-water marinas or heavy swinging moorings, the Bi-Loup 36 is designed to settle flat on its twin, shallow-draft keels when the tide recedes. This unique capability permits access to pristine, shallow estuaries and tidal drying harbors of Northern Europe that are off-limits to other 36-footers.
In terms of market competition, the Bi-Loup 36 occupies a unique middle ground. It competes directly with aluminum lift-keelers and composite twin-keelers, but Wrighton achieved this with a solid fiberglass hull and a highly recognizable panoramic deck saloon configuration. The interior design reflects this focus on life at anchor. Instead of the typical dark layout of traditional cruising yachts, the Bi-Loup 36 boasts a raised coachroof with massive, wrap-around windows that provide near-270-degree panoramic visibility. The interior woodwork is clean and utilitarian yet warm, utilizing light-colored laminates and solid timber moldings that emphasize the abundance of natural light. It is a boat designed for living close to the marine environment, offering a seamless transition between the cockpit and the saloon.
Variations & Configurations
Throughout its decade-long production run, the Bi-Loup 36 saw several distinct layout and rigging evolutions, which eventually culminated in the refined Bi-Loup 365. The vessel was offered in both two-cabin and three-cabin configurations. The two-cabin version is highly favored by long-distance couples, as it frees up the starboard aft quarter for an expansive wet locker and storage locker accessible from both the cockpit and the interior. The three-cabin layout, conversely, maximizes sleeping capacity for up to eight people by incorporating symmetrical double aft cabins—a remarkable feat for a 36-foot boat.
Architecturally, Wrighton offered two distinct interior arrangements. The classic version featured a raised galley and navigation station positioned near the companionway for optimal ventilation, with the main U-shaped dinette set slightly lower in the hull. The highly popular "Deck Saloon" variant raised the entire salon floor, placing the dinette directly level with the panoramic windows so that guests could enjoy exterior views while seated. Rigging configurations typically featured a 9/10 fractional sloop rig with swept-back spreaders. To facilitate short-handed sailing, some owners opted for a self-tacking jib, while those seeking maximum power in lighter airs retained the overlapping genoa on a furler.
Sailing Performance & Handling
Historically, bilge-keel boats suffered from a reputation of poor windward performance and excessive drag. Vincent Lebailly addressed this by engineering the Bi-Loup 36 with high-aspect, asymmetric twin keels. When the boat heels, the leeward keel rotates to a near-vertical position in the water, generating significant lift and keeping leeway to a minimum, while the windward keel rises toward the surface, reducing drag.
With a sail-area-to-displacement ratio of 20.25, the Bi-Loup 36 carries a generous sail plan that ensures excellent responsiveness even in light coastal breezes. Its ballast-to-displacement ratio of 39.34% reflects a highly stable, stiff platform; the boat resists excessive heeling and stands up to its canvas far longer than more tender production monohulls of the same era. A displacement-to-length ratio of 192.08 places it in the medium-light displacement category, making the helm feel surprisingly nimble. The boat is characterized by a capsize screening ratio of 1.93, comfortably below the ocean-safety threshold of 2.0, proving its capability for true offshore passages. Its comfort ratio of 24.5 indicates a motion that is relatively sea-kindly, though its wide beam carried far aft means it will exhibit a quicker, more buoyant motion in a short, steep chop than a heavy, narrow-draft keelboat.
Market Snapshot & Economics
On the brokerage market, the Bi-Loup 36 is a relatively rare find due to Wrighton’s low-volume, semi-custom production schedule. Because of this scarcity and the highly sought-after nature of modern twin-keel cruisers, the model commands a relative price premium compared to standard mass-production cruisers from larger builders. It retains its value exceptionally well, especially in regions with high tidal variations such as the English Channel, the French Atlantic coast, and parts of the Pacific Northwest.
For prospective buyers, the economics of owning a Bi-Loup 36 are highly favorable, provided the boat was well-maintained. The absence of complex lifting-keel mechanisms (such as hydraulics, cables, or pivot pins found on swing-keelers) dramatically reduces long-term maintenance costs and eliminates the risk of mechanical keel failures at sea. However, because these boats are often used in demanding tidal environments, buyers should budget for professional hull and keel surveys.
Known Issues & Triage
While the Bi-Loup 36 is built to a high standard, its specialized mission as a beachable cruiser introduces specific areas that require careful inspection.
The primary structural concern lies in the keel-to-hull joints. Because the boat is designed to stand upright on its two keels, the internal floor grid, keel trunks, and backing plates are subject to unique, localized cyclic stresses. When a boat takes the ground, the entire weight of the vessel is transferred to these joints. Over time, hard groundings or soft mud-slumping can cause stress cracks or micro-separation in the fiberglass laminate around the keel fillets. A thorough inspection from both inside the bilge and outside the hull is essential to ensure structural integrity.
Another area of concern is the large panoramic acrylic windows. While they provide excellent light, the expansive curved surfaces are subject to thermal expansion and deck flexing. Over time, this can degrade the polyurethane adhesive seal, leading to persistent cabin leaks. Remedying this requires completely removing the windows, preparing the fiberglass flange, and using high-quality structural glazing sealants alongside UV-resistant primers. Additionally, some mid-production units built during Wrighton's corporate transitions exhibit minor cosmetic gelcoat crazing around tight deck corners and variations in the interior cabinet varnishing quality, which require cosmetic attention rather than structural repairs.
Modernization & Upgrades
For owners looking to modernize the Bi-Loup 36 for extended, self-sufficient cruising, several upgrades have become standard. Given the boat's design for beaching and drying out in remote, shallow anchorages, upgrading the house electrical system to a modern lithium iron phosphate (LiFePO4) battery bank is highly beneficial. Lithium systems allow owners to run high-draw appliances and refrigeration systems for days without needing to run the engine or a generator, preserving the peace of quiet anchorages.
To keep these batteries topped up, veteran owners frequently install a stainless-steel solar arch over the transom. The wide stern of the Bi-Loup 36 easily accommodates an arch carrying multiple high-output solar panels without disrupting the boat's lines or safety gear. Furthermore, while the twin keel design and single rudder provide excellent tracking under sail, the reduced prop-wash over the rudder at very low speeds can make maneuvering in tight, windy marinas challenging. Retrofitting a tunnel bow thruster is a highly recommended upgrade that significantly eases stress when docking.
The Verdict
The Bi-Loup 36 is an intelligent, highly specialized cruising yacht that succeeds in marrying the practical benefits of a twin-keel configuration with the offshore safety and sailing performance of a modern cruiser. While it is not a racing yacht, its asymmetric keels and powerful sail plan elevate it far above historical bilge-keel designs, delivering a stiff and stable ride in fresh coastal breezes. Its panoramic deck saloon offers an unparalleled sense of volume and light for a vessel of this size. For families, couples, or solo sailors seeking to explore tidal rivers, estuaries, and dried-out harbors without sacrificing ocean-going capability, the Bi-Loup 36 stands out as a unique and highly capable passagemaker 2.
Pros
- Asymmetric twin-keel design allows for easy beaching and drying out upright without sacrificing windward performance.
- Light, bright, and airy interior with near-270-degree visibility through panoramic coachroof windows.
- Very stiff and stable at sea, with a high ballast-to-displacement ratio that easily manages freshening winds.
- Low maintenance requirements for the keels compared to complex hydraulic or swing-keel configurations.
- High-volume interior layouts available in practical two- or three-cabin configurations.
Cons
- Increased wetted surface area of twin keels introduces more drag in very light winds compared to a deep fin keel.
- Large panoramic windows are prone to adhesive failure and leaks over time, requiring periodic resealing.
- Single rudder and twin-keel configuration can make tight-quarters marina maneuvering tricky without a bow thruster.
- Limited availability on the brokerage market due to low-volume, semi-custom production.
