Southerly 580 Information, Review, Specs

Sailing Performance & Handling

The Southerly 580 is a powerful, heavy-displacement cruiser (approximately 52,910 lbs) designed by the late Ed Dubois, whose influence brought superyacht-level performance to the variable-draft concept. The yacht utilizes a Solent rig, featuring a 140% genoa for light-wind power and a self-tacking jib for effortless short-tacking in heavier air. According to editorial reviews by Cruising World, the hull’s fine entry and long waterline allow it to track exceptionally well, frequently reaching 6 knots in just 7-10 knots of true wind.

Handling is defined by the twin-rudder system, which provides immense grip even when the boat is heavily heeled. Because the rudders are canted, they remain vertical and effective when the yacht is under a press of sail, a necessary feature for a boat with a relatively flat hull bottom. The variable draft is the boat's primary performance lever; with the keel fully extended to 10' 4", the 580 exhibits the stiffness and pointing ability of a dedicated deep-fin racer. Conversely, raising the keel partially while downwind reduces wetted surface area and drag, significantly improving speed on a broad reach.

Interior Comfort & Variations

The hallmark of the 580’s interior is its raised deck saloon, which offers 270-degree panoramic views through large safety-glass windows. This design places the social center of the boat on a higher plane than the galley and cabins, connecting the crew to the horizon even while below deck. The fit-out typically reflects high-end British craftsmanship, utilizing solid woods and hand-finished cabinetry.

As a semi-custom yacht, the 580 offers several cabin configurations. The classic Southerly layout features a massive master suite aft, taking advantage of the beam carried well toward the stern. Modern variants under Concept Marine Group have introduced more modular approaches, including a four-cabin layout for larger families or charter use. A key variation often found on this hull (including the sibling 57RS) is the inclusion of a tender garage in the transom, which can accommodate a Williams 285 Jet RIB, a luxury rarely seen on sailboats under 60 feet.

Popular Mentions & Media

The Southerly 580 and its predecessor, the 57RS, have a significant footprint in blue-water cruising circles. The design gained international acclaim when it was named "Best Boat" by various nautical publications shortly after its initial launch. The model is also closely associated with high-profile voyagers like Paul and Sheryl Shard of the Distant Shores series, who have used various Southerly models to demonstrate the unique advantages of variable draft in remote locales like the Bahamas and the French canals.

Known Issues & Buyer’s Checklist

Prospective buyers must focus their due diligence on the complex mechanical systems that make the Southerly 580 unique.

• Keel Pennants & Hydraulics: The massive 7,385 lb keel is moved by a hydraulic ram and supported by heavy-duty pennants. Owners report that these pennants should be inspected annually and typically replaced every 6-8 years to prevent stretching or failure.
• Pivot Pin and Bushings: The stainless steel pivot pin is the most critical structural point. In older hulls, rust or wear in the bushings can lead to "keel clunk." Inspection requires dropping the grounding plate, a task that must be performed by a yard familiar with swing-keel architecture.
• Grounding Plate Corrosion: The cast-iron grounding plate acts as secondary ballast (adding roughly 11,000 lbs) and protection. If the epoxy coating is compromised, the plate can suffer from exfoliating rust, which can eventually jam the keel in the housing.
• Window Seals: The expansive deck saloon windows are a highlight, but they are subject to significant stress in heavy seas. Check for evidence of recurring leaks or crazing in the glass/acrylic panels.

Community & Resources

Owners of the 580 often belong to the Southerly Owners Association (SOA), a highly active technical group that maintains a library of manuals and "mod-lists" for maintaining the complex lifting mechanisms. For technical specifications and design history, the Humphreys Yacht Design archives (who designed several other yachts in the range) and the official manufacturer pages provide the most reliable data.

The Verdict

The Southerly 580 is a niche masterpiece for sailors who refuse to choose between offshore performance and coastal exploration.

Pros:

• Unrivaled versatility with a draft ranging from 3' 6" to over 10'.
• Superyacht-standard interior with a panoramic raised saloon.
• Excellent heavy-weather stability and tracking due to the Ed Dubois hull.
• Ability to dry out on its own bottom for maintenance or tidal anchoring.

Cons:

• Significantly higher maintenance requirements for the keel hydraulics and pivot.
• High wetted surface area can hinder light-wind performance without the genoa.
• Premium price point reflects its complex engineering and low production numbers.