Southerly 135 Mk II Information, Review, Specs

Sailing Performance & Handling

Under sail, the Southerly 135 Mk II behaves like a much larger, fixed-keel yacht when the heavy airfoil-shaped keel is fully lowered. With a draft of nearly ten feet, the boat exhibits exceptional windward performance and a high righting moment, which is unusual for a variable-draft vessel. The ballast is split between the moving keel and a massive cast iron grounding plate, which provides a low center of gravity even when the keel is retracted. This configuration lends the boat a "planted" feel in a seaway, characterized by a soft motion and predictable tracking.

In heavy air, the 135 Mk II shines as a stable platform. Many hulls were rigged as cutters or with a self-tacking jib, facilitating easy short-handed sailing. According to editorial analysis from Yachting Monthly, the Southerly range is praised for its ability to handle offshore conditions that would intimidate lighter coastal cruisers. However, because of its significant displacement and the drag associated with the grounding plate, the 135 Mk II is not a light-airs specialist. It requires a decent breeze to find its stride, but once moving, its momentum carries it comfortably through chop. The steering is typically responsive, though sailors transitioning from lighter performance yachts may find the helm feedback more dampened due to the substantial skeg-protected rudder.

Interior Comfort & Variations

The interior of the Southerly 135 Mk II is a masterclass in the "Deck Saloon" philosophy. By raising the floor of the main saloon, Northshore provided panoramic 360-degree views through toughened glass windows, a feature that significantly reduces the "cave-like" feeling found in traditional deep-hull cruisers. This layout allows the navigator or cook to maintain a lookout while sheltered from the elements.

The Mk II specifically improved the galley ergonomics and the transition between the saloon and the aft cabin. The master suite, located aft, is remarkably spacious for a 45-footer, often featuring a centerline island berth and an en-suite head. Sibling variants of the hull included the original 135 Mk I, which had a more traditional transom and slightly different interior joinery. Some owners opted for a three-cabin layout, while the "Owner’s Version" prioritized the aft suite and a larger workshop area. The joinery is typically finished in high-quality teak or cherry, reflecting Northshore’s heritage of traditional British craftsmanship. The headroom throughout the vessel is generous, often exceeding 6'4" in the main cabin areas, making it a preferred choice for taller sailors.

Known Issues & Buyer’s Checklist

Prospective buyers of a Southerly 135 Mk II must prioritize the inspection of the unique mechanical systems that define the boat.

• Swing Keel Hydraulics: The keel is operated by a heavy-duty hydraulic ram and pennant system. Buyers should check the age of the hydraulic hoses and look for signs of fluid leaks around the pump and ram. The pivot pin, which secures the keel to the hull, is a high-load component that should be inspected for wear or play.
• Grounding Plate and Pennants: Because the boat is designed to sit on its bottom, the cast iron grounding plate is subject to corrosion and impact. It is vital to inspect the condition of the protective coatings and the "Teflon" or composite pads that prevent the keel from knocking within the trunk.
• Rudder and Skeg: While the rudder is protected, the bearings and the structural integrity of the skeg should be verified, especially if the boat has been frequently beached or used in areas with significant tidal grounding.
• Window Seals: The large deck-saloon windows are a hallmark of the design but can develop leaks over decades of thermal expansion. Inspect the interior wood trim for water staining around the window frames.

Community & Resources

The Southerly brand maintains one of the most dedicated owner communities in the sailing world. The Southerly Owners Association is an essential resource for technical manuals, spare parts sourcing, and organizing rallies. For design-specific inquiries, the Humphreys Yacht Design archives provide historical context on the evolution of the 135 hull and its transition into the newer 42RST and 47 models.

The Verdict

The Southerly 135 Mk II is a specialized blue-water tool that offers a level of freedom few other 45-foot yachts can match. It is an ideal vessel for the serious cruiser who refuses to be limited by deep-draft constraints but still demands a boat capable of crossing oceans in comfort.

Pros:

• Unrivaled Versatility: The ability to sail with a 9'6" draft and tuck into 3' of water is a game-changer for coastal exploration.
• Visibility: The raised deck saloon provides excellent natural light and safety while on watch.
• Build Quality: Substantial GRP layup and high-end interior joinery characteristic of Northshore’s peak years.

Cons:

• Complexity: The swing-keel mechanism requires more maintenance and vigilance than a fixed keel.
• Weight: High displacement makes the boat somewhat sluggish in light winds (under 10 knots).
• Price: Due to their unique capabilities and limited production, they tend to command a premium on the second-hand market.