Built from 1986 by Impulse Marine and later Johnson Boatworks, this William Cook-designed 21-footer represents a thoughtful approach to compact coastal cruising and club racing. With 150 hulls produced during its production run, the Impulse 21 developed a reputation as a well-balanced performer that punches above its weight class. The fractional sloop rig and modern fin keel with spade rudder configuration deliver responsive handling and solid upwind performance. At 1,300 pounds with 600 pounds of ballast, the boat maintains excellent stability while remaining light enough for easy trailering. The generous 208 square feet of sail area provides spirited performance in light to moderate conditions, with a sail-area-to-displacement ratio of 28 indicating good acceleration and responsiveness. The fiberglass construction prioritizes durability and low maintenance, while the 8-foot beam maximizes interior space within the compact 21-foot length. A comfort ratio of 6.54 and capsize screening formula of 2.93 suggest this boat is best suited for protected coastal waters and weekend cruising rather than extended offshore passages. For sailors seeking an affordable entry into sailboat ownership or a nimble daysailer with basic overnight capabilities, the Impulse 21 offers proven performance in a manageable package.
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What is the Impulse 21's sail area to displacement ratio?
The Impulse 21 has a Sail Area to Displacement ratio (SA/D) of 28. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.
What is the Impulse 21's comfort ratio?
The Impulse 21 has a Ted Brewer Comfort Ratio of 6.54. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.
Is the Impulse 21 safe for offshore sailing?
The Impulse 21 has a Capsize Screening Formula value of 2.93. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.
What is the hull speed of the Impulse 21?
The theoretical hull speed of the Impulse 21 is 5.76 kn knots, calculated from its waterline length.
How much does a Impulse 21 weigh?
The Impulse 21 has a displacement of 1,300.00 lb and a length overall (LOA) of 21.00 ft.
Who designed the Impulse 21?
The Impulse 21 was designed by William Cook, first built in 1986.