Designed by C. S. J. Roy and built by Trident Marine in the UK starting in 1980, this 36-foot cruising sailboat represents solid British yacht-building tradition from the early 1980s. The masthead ketch rig provides excellent sail handling flexibility, allowing crew to reduce canvas easily in deteriorating conditions while maintaining good balance under various sail combinations. The twin keel configuration stands out as the boat's most distinctive feature, offering significant advantages for coastal cruising and gunkholing. This shallow 3.75-foot draft opens up numerous anchorages and harbors inaccessible to deeper-draft vessels, while the twin keels provide stability when taking the ground in tidal waters—a particularly valuable trait for exploring European coastlines and tidal estuaries. With a displacement of 13,440 pounds and ballast ratio supporting the twin keel design, this fiberglass cruiser delivers the stability and seaworthiness expected of British yacht construction. The comfort ratio of 26.87 suggests a motion that favors crew comfort over racing performance, while the capsize screening formula of 1.88 indicates reasonable offshore capability. At 425 square feet of sail area driving a 29-foot waterline, the Seaforth 36 is well-suited for leisurely coastal cruising and extended gunkholing adventures where shallow draft and good ground-sitting ability matter more than pure sailing performance.

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