With limited documentation available, the International 21 represents one of those intriguing smaller sailboats that emerged during an era when builders were exploring various approaches to affordable recreational sailing. This compact vessel appears to have been designed with weekend sailors and smaller crews in mind, making it well-suited for coastal cruising and day sailing adventures. Based on its name and size class, the International 21 likely features a straightforward design philosophy emphasizing simplicity and ease of handling. Boats of this vintage and size typically offered good learning platforms for developing sailors while still providing enough capability for coastal exploration. The modest proportions would have made trailer sailing practical, opening up cruising possibilities beyond a single home port. While comprehensive historical records remain elusive, the International 21 fits into that category of wholesome family sailboats that prioritized accessibility over racing performance. Prospective buyers researching this model should expect a boat that delivers honest sailing characteristics without unnecessary complexity. The design likely emphasizes stability and predictable handling over cutting-edge performance, making it potentially attractive to those seeking a straightforward sailing experience. As with many boats from this era, finding well-maintained examples may require patience and thorough inspection.
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What is the International 21's sail area to displacement ratio?
The International 21 has a Sail Area to Displacement ratio (SA/D) of 19.32. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.
What is the International 21's comfort ratio?
The International 21 has a Ted Brewer Comfort Ratio of 10.24. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.
Is the International 21 safe for offshore sailing?
The International 21 has a Capsize Screening Formula value of 2.44. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.
What is the hull speed of the International 21?
The theoretical hull speed of the International 21 is 5.58 knots, calculated from its waterline length.
How much does a International 21 weigh?
The International 21 has a displacement of 1,750.00 lb and a length overall (LOA) of 21.50 ft.
Who designed the International 21?
The International 21 was designed by Helsen, first built in 1976.