Its appeal doesn’t rest on any single headline figure. Instead, the K-40 brings speed and cruising ability together in a carvel-planked wooden hull—one that owners have continued to race and restore for decades.
Design and Construction
The K-40 has a solid wood hull with mahogany carvel planking over oak frames, as well as a wood deck. It measures 39.83 feet overall and 27.33 feet on the waterline, with 10.33 feet of beam. Displacement is 14,250 pounds, including 5,000 pounds of lead ballast.
Those figures give a ballast-displacement ratio near 35 percent and a capsize ratio of 1.7. Along with the reassuring stability recorded by Sailboat Data & Sail Specifications, they place the K-40 firmly in the fast cruiser-racer category rather than among lightly built racers.
Sailboat Data & Sail Specifications describes the design as prioritizing seaworthiness, speed, easy handling, and beauty. It also notes that many hulls were commissioned for serious cruising while remaining competitive.
Rig and Handling
The K-40 is primarily a masthead sloop, though not every boat left the factory as a pure sloop. Some carry cutter elements, and individual hulls were later converted. Hull #3 is a cutter, while hull #7 became a cutter-rigged sloop. These variations reflect owners tailoring the rig to their cruising or racing needs without leaving the original design’s balance behind.
The sail plan is generous, built around a 43-foot I dimension and a 37-foot mainsail luff. A 150-percent genoa measures roughly 475 square feet, while the spinnaker provides 968 square feet for downwind sailing. The substantial area forward of the mast helps explain why Sailboat Data & Sail Specifications credits the class with excellent light-air performance. The same review describes the boat’s motion as comfortable in all conditions.
Accommodation and Refits
Owners’ records show interiors adapting over long service lives rather than adhering to one fixed factory plan. Hull #26 received custom cabinetry in the saloon, navigation station, galley, head, and V-berth. Its navigation station and head were also redesigned during a five-year restoration that renewed the ribs, floors, keel bolts, and all fastenings. The project included new plumbing and electrical systems as well.
Hull #37 remains essentially original apart from a Groco head, an added holding tank, and a teak-and-holly sole. Its original Gray Marine engine was replaced with a Volvo Penta.
Across the fleet, the general pattern has been sympathetic updating rather than wholesale redesign. That suggests the baseline layout was serviceable enough to retain, even as owners modernized systems and adapted individual boats to their needs.
Racing Record
The K-40 established its reputation on the racecourse. Hull #4 won the San Francisco Bay Yankee Cup in 1978. Hull #9 compiled an extensive Puget Sound record, including Swiftsure from 1960 through 1964 and NorPac. Hull #25 won the LA–Mazatlan Race outright in 1961, then placed third in 1963.
MAMIE, whose hull number is unknown, competed in the Transpac in 1963, 1965, 1969, 1971, 1973, and 1975, earning a second overall. Hull #16 also raced several TransPacs successfully. Hull #34 later collected McNich classic wins, including the Strathmore Cup in 2007.
Results spanning five decades provide the clearest evidence that the design’s fast cruiser-racer intent held up in practice.
Ownership and Restoration History
The histories of individual boats illustrate both the K-40’s longevity and the commitment needed to preserve one.
Hull #1 was originally named Tomboy II and retained by the factory as a prototype before becoming Aladdin’s Lamp. Rudy Severns spent 18 years slowly restoring the boat in Cottage Grove, Oregon. It was later moved to Bellingham, Washington, for final work.
Hull #31 was built for James E. Doane of Chicago and sailed on the Great Lakes for roughly 20 years. It reportedly circled the South Pacific and Hawaii, then was restored to bristol condition by William E. Harris from 1998 to 2004.
Hull #36’s 2003 work included replacing 53 frames below the waterline and seven planks, as well as completing full spline work.
These histories provide a useful counterweight to the K-40’s romantic West Coast racing image. The boats demand committed wooden-boat maintenance.
The Verdict
The Kettenburg 40 is a wooden cruiser-racer with a genuine Transpac and offshore record, a seakindly motion, and a sail plan that performs well in light air. Its carvel-planked mahogany hull requires the attention expected of any wooden boat. Even so, the fleet’s survival—with hulls still racing and winning classic events past their fiftieth year—argues for a design that rewards the effort.
Pros
- Documented offshore and regatta success across decades
- Reassuring stability and comfortable motion in all conditions
- Generous genoa and spinnaker area for light-air speed
- Solid cruising accommodation that lends itself to sympathetic refits
Cons
- Wooden carvel construction requires ongoing expert maintenance
- Variations in individual hull modifications complicate uniform survey expectations
