Design and Construction
Felci Yacht Design gave the 520 a fractional sloop rig on a fin keel with a bulb and spade rudder — geometry that prioritizes pointing ability and helm responsiveness over the passive stability of a full-keel passagemaker. Hull construction is hand-laid solid fiberglass below the waterline and PVC-cored above the waterline and through the deck, with polyester resin throughout and E-glass reinforcement at high-load areas including the chainplates. A structural grid is glued and tabbed into the hull. Buyers choose between a standard draft of seven feet six inches or a shoal option at six feet four inches, and between a standard mast of just over seventy feet or an adventure-package spar pushing to nearly seventy-five feet to carry a larger sail plan. Two engine options are offered: a 75 hp diesel with saildrive or a 110 hp diesel with shaft drive. The displacement of 33,609 pounds and a capsize screening formula of 1.96 place the boat squarely in the capable offshore cruiser bracket without tipping into extreme ocean-passage territory.
Rig and Sailing Performance
The 9/10 fractional rig supports 1,085 square feet of working sail, a figure that yields a sail area-to-displacement ratio of 16.7 — enough to be called reasonably good performance in the language of the design ratios, and the sea trial confirmed it. Boat of the Year judges recorded 5.5 to 6 knots in 9 to 11 knots of wind, and the 75 hp engine pushed the hull to 9.2 knots wide open — useful context for the passage-making calculator. The 9/10 fractional setup supports a traditional or in-mast furling mainsail, and a composite bowsprit — an improvement over the original GL 500's cumbersome halyard-deployed anchoring arrangement — provides an attachment point for an optional gennaker that will make the hull fly downwind. The German-style double-ended mainsheet arrangement gives the helmsman mainsail control at the wheel on either tack, and the twin Lewmar electric winches let one person tack the slightly overlapping genoa without leaving the helm. Two sets of outboard winches confirm the single-handed capability of this big boat. The superyacht-style binnacle command pods organize chartplotters, instruments, compass, and optional throttle and thruster controls at two levels — readable and reachable without leaving the wheel.
Cockpit and Deck Layout
The cockpit reorganization is where the 520 most visibly surpasses its predecessor. The portside transom seat lifts outboard to reveal a sink, while a grill is now tucked into the center section rather than hanging off the stern. With the lid down, that same surface becomes a sunpad; flipped forward, it becomes a guest seat at the aft end of the cockpit table, which itself contains a 40-quart refrigerator drawer for provisions at hand. To starboard, the seat lifts to reveal steps to the swim step; an optional electrically deployed two-level swim platform provides graduated access to the water. Forward of the wheels, bench seats convert between crew stations underway and sun lounges or outdoor berths at anchor — what the judges described as Transformer-like attributes easily toggled between sailing and living modes. The integrated composite bowsprit serves double duty as both anchor roller and asymmetric spinnaker attachment, solving what had been a genuine weakness on the earlier model.
Accommodations
Below decks, the athwartships split galley positioned at the main bulkhead frees the widest section of the saloon for living and entertaining. The stove and sink sit to port; to starboard are two refrigerator drawers. Multiple cooks can work simultaneously, and the arrangement adds a degree of privacy to the master stateroom forward, though the distance to the cockpit is notable when underway. An electric folding table adjusts across three heights from coffee-table to full dining. The origami nav desk swings between forward and aft-facing positions and can be leveled to compensate for heel; pushed aft in port, it allows a full-length settee or extra sea berth to materialize where the desk had been. Light arrives through two overhead hatches, fixed portlights over the galley, and numerous deck hatches including two over the queen island berth in the owners stateroom. The layout comes in four configurations ranging from three cabins and three heads up to four cabins and a Pullman berth sleeping up to twelve. The port aft double converts easily to twin singles. Moabi or light oak interior finishes, Corian countertops, and washbasins in the heads deliver a level of fit and finish that matches the conceptual ambition of the design.
Known Issues and Criticisms
The sea trial produced two specific complaints worth noting. The engine panel is positioned near the cockpit sole under the rear seat, making it hard to read and the throttle awkward to reach from the helm — a meaningful ergonomic lapse on an otherwise well-organized cockpit. The second issue is that all sheets and halyards run the same color, creating potential confusion for new crew who need to identify lines quickly; labeling is a simple but necessary fix. The distance between the split galley and the cockpit is also a practical consideration: carrying hot food to the helm in a seaway requires care. These are refinement issues rather than structural concerns, and the 520 earned its awards in spite of them, but buyers should address them during commissioning.
Refits and Upgrades
The factory option list covers most of the obvious additions: the adventure-package mast, the two-level electric swim platform, full electronics suites, air conditioning, bow thruster, and the in-mast furling mainsail. Given the single-color line problem, one of the first owner priorities should be re-running halyards and sheets in differentiated colors or adding labeled clutches. The composite bowsprit already accommodates a gennaker, so adding an asymmetric is straightforward without deck work. Buyers who want the larger sail plan and more windward performance should specify the adventure mast at build; retrofitting a longer spar is a more involved project. The 110 hp shaft-drive engine option suits extended bluewater passages where the additional power and mechanical simplicity of shaft drive outweigh the weight penalty.
The Verdict
The Dufour 520 Grand Large is one of the more carefully considered production cruisers to come out of the Felci collaboration with Dufour. It genuinely succeeds at being both a serious sailing machine and a capable entertaining platform — a combination that sounds like marketing language but holds up under scrutiny. The hull is efficient, the rig is manageable short-handed, the accommodations are flexible enough to cover everything from private family cruising to bareboat charter, and the cockpit transforms convincingly between passage-making and anchoring modes. Its ergonomic shortcomings are real but not disqualifying, and they are the kind of thing an attentive owner addresses once and then forgets about.
Pros
- Umberto Felci hull delivers genuine sailing performance with a competitive SA/D ratio and responsive helm
- Short-handed capable with electric winches and twin outboard helm stations
- Flexible four-layout cabin plan adapts to private cruising or charter
- Outdoor galley integrated into cockpit transom without sacrificing helm ergonomics
- Two mast options and two keel options let buyers tune the boat for their sailing grounds
- High water and fuel capacity for the LOA
Cons
- Engine panel and throttle positioned awkwardly at cockpit sole, hard to read and reach
- Same-color halyards and sheets create confusion without additional labeling
- Long haul from the split galley to the cockpit creates challenges in a seaway
- Holding tank capacity modest at 14 gallons relative to the accommodation plan
- Capsize screening formula of 1.96 is near the accepted offshore threshold, not the margin a dedicated blue-water boat would carry
