Interlake

Dating back to 1933, Francis Sweisguth's Interlake design has established itself as one of America's most enduring small boat racing classes. This 18-foot centerboard dinghy combines classic proportions with competitive performance, making it equally suited for club racing and recreational sailing in protected waters. The Interlake's fractional sloop rig and generous 175 square feet of sail area deliver spirited performance while remaining manageable for sailors of varying experience levels. Its moderate beam of 6.25 feet provides good stability without sacrificing speed, while the centerboard configuration allows for flexible sailing in shallow venues and easy launching from beaches or ramps. Originally built in wood and later adapted to fiberglass construction by Customflex, the design has maintained its competitive edge across nine decades of evolution. The boat's displacement of 650 pounds keeps it light enough for car-topping while providing sufficient stability for confident sailing. With a capsize screening formula of 2.89, the Interlake remains well within safe parameters for its intended use in lakes, bays, and protected coastal areas. Active racing fleets across North America continue to demonstrate the design's lasting appeal, making used examples relatively easy to find and competitively campaign.

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