Design and Construction
The 470 has a solid-fiberglass hull and carries 13,492 pounds of iron ballast, giving a ballast ratio of 35 percent. Her 14.6-foot beam and 42.8-foot waterline produce a length-to-beam ratio of 3.22.
The swing keel reduces draft to roughly 3.3 feet when raised, opening shallow marinas and anchorages that would be closed to a fixed-keel 47-footer. With the keel down, she draws just over ten feet, providing the lateral grip and righting moment expected of a bluewater design.
Her capsize screening value is 1.74, which means that, by this formula alone, she would be accepted to participate in ocean races. A displacement-length ratio of 216 categorizes her among moderate racers—a telling indication that Jones balanced cruising weight with a hull that isn’t sluggish to drive. An immersion rate of about 2,183 pounds per inch reflects the hull’s sheer mass, while a Motion Comfort Ratio of 37.1 suggests a settled rather than skittish ride in a seaway.
Rig and Handling
The 470 has a fractional sloop rig and a sail-area-to-displacement ratio of 14.64, supporting balanced performance under sail without demanding a large crew. The hull’s wetted surface measures about 796 square feet. Together with a theoretical displacement hull speed of 8.8 knots, that helps frame expectations for her top-end speed under sail.
The sheet specifications convey the scale of the rig. The mainsheet is 117.7 feet long and 5/8-inch in diameter. The jib and genoa sheets are each 47.1 feet long at the same diameter, while the spinnaker sheet is 103.6 feet long. Those lengths point to a big, powerful deck plan, with leading and trimming loads engineered for sustained offshore use rather than dockside convenience.
Accommodations and Tankage
The available record doesn’t describe the interior arrangement in detail. However, the 470’s displacement and beam, together with three-cabin owner layouts seen in the broader market, indicate a volume-driven cruising interior rather than a stripped-out racer.
Southerly’s lineage through the 2010s centered on comfortable liveaboard cruisers. Tankage of 129 gallons of water and 174 gallons of diesel further reinforces the sense that the 470 was conceived for passages and extended stays aboard rather than coastal hops.
The Verdict
The Southerly 470 is a thoughtfully proportioned Stephen Jones design. Its swing keel reconciles shoal-draft freedom with a heavy-displacement, seakindly hull. The capsize screening, comfort, and displacement-length ratios describe a boat engineered to cross oceans while still being able to tuck into shallow coves. The core naval architecture is coherent and purposeful.
Pros
- Swing keel provides a 3.3-foot raised draft for marina access
- A capsize screening value of 1.74 meets ocean-race acceptance by formula
- The 35 percent ballast ratio and 37.1 Motion Comfort Ratio suggest stable, damped motion
- Fractional rig and 14.64 sail-area-to-displacement ratio balance sail power with manageability
Cons
- Heavy 38,000-pound displacement limits light-air acceleration compared with lighter cruisers
- The available record doesn’t describe the interior arrangement or systems documentation
