Designed by Ralston and built by Canadian manufacturer Seair Yachts Ltd. beginning in 1975, this 27-footer represents a solid example of mid-1970s pocket cruiser design philosophy. With its fin keel and rudder-on-skeg configuration, the Seair 27 offers a good balance between directional stability and maneuverability that appeals to both coastal cruisers and weekend sailors. The boat's substantial displacement of 6,900 pounds, combined with 2,900 pounds of ballast, creates a stable platform that handles choppy conditions well. The comfort ratio of 27.96 indicates a motion that's neither too quick nor uncomfortably slow, making it suitable for extended coastal passages. Meanwhile, the capsize screening formula of 1.72 suggests reasonable stability for offshore work, though this design is primarily intended for coastal and protected water sailing. The masthead sloop rig provides straightforward sail handling, while the sail area-to-displacement ratio of 14.22 indicates moderate performance in light to medium winds. Fiberglass construction ensures durability with reasonable maintenance requirements. Hull speed calculations suggest comfortable passage-making speeds around 6 knots, making this an ideal choice for sailors prioritizing comfort and seaworthiness over racing performance in their coastal adventures.
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What is the Seair 27's sail area to displacement ratio?
The Seair 27 has a Sail Area to Displacement ratio (SA/D) of 14.22. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.
What is the Seair 27's comfort ratio?
The Seair 27 has a Ted Brewer Comfort Ratio of 27.96. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.
Is the Seair 27 safe for offshore sailing?
The Seair 27 has a Capsize Screening Formula value of 1.72. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.
What is the hull speed of the Seair 27?
The theoretical hull speed of the Seair 27 is 6.25 kn knots, calculated from its waterline length.
How much does a Seair 27 weigh?
The Seair 27 has a displacement of 6,900.00 lb and a length overall (LOA) of 26.83 ft.
Who designed the Seair 27?
The Seair 27 was designed by Ralston, first built in 1975.