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The Core Sound 20 Mark 3 is an American sailboat that was designed by B&B Yacht Designs for cruising and first built in 2014. The boat is supplied as a series of kits and plans for amateur construction. [1] [2] The Core Sound 20 Mark 3 is a development of the Core Sound 20 and is named for the North Carolinian body of water. [2]
A few of the early boats were designed with a deep fin cast iron keel with a bulb. A fiberglass fin keel version was built in the late 1980s and early 1990s. As with the early cast iron fin boats only a few were manufactured. The fin keel hull, deck and cabin are identical to the shoal keel with centerboard boats. Montgomery 17 - swing keel
The keel-only-equipped version of the boat has a draft of 2.00 ft (0.61 m), while the centerboard-equipped version has a draft of 4.50 ft (1.37 m) with the centerboard extended and 2.00 ft (0.61 m) with it retracted, allowing operation in shallow water, beaching or ground transportation on a trailer.
The centerboard is two part, with a bronze shoe on the leading edge. The centerboard trunk was molded into the hull, below the cabin sole. Internal lead ballast was cast in place and covered in fiberglass. Fuel and water tanks were molded in fiberglass integral to the hull. An overlapping deck to hull joint was bolted together and sealed with ...
The Thunderbird class sailboat was designed in 1958 by Seattle Washington naval architect Ben Seaborn, [1] in response to a request from the Douglas Fir Plywood Association (now APA - The Engineered Wood Association) of Tacoma, Washington for design proposals for a sailboat that would "... be both a racing and cruising boat; provide sleeping accommodations for four crew; be capable of being ...
A fore and aft, pivoting centreboard can also be used to move the centre of lateral resistance aft to match a change in sail plan, such as furling or dropping the jib. A retracting centreboard is more complex than a fixed keel, and most take up space inside the hull of the boat that could otherwise be used for passenger accommodation. Other ...
The boat has a draft of 5.18 ft (1.58 m) with the centerboard extended and 2.00 ft (0.61 m) with it retracted, allowing beaching or ground transportation on a trailer. [ 1 ] Later examples of the boat, between 1980 and 1985 are fitted with a Japanese Yanmar 3GM diesel engine of 21 hp (16 kW).
The boat is supported by an active class club, the Jeanneau Owners Network. [11] In a 2019 review for Sail Magazine, Charles J. Doane found that some of the smaller sail plans, including then one he tested on the water, were under-powered. He concluded, "For anyone looking for a modern compact cruising sailboat this is a hard vessel to ignore.