The Isotope is an American

catamaran A catamaran () (informally, a "cat") is a watercraft with two parallel hull (watercraft), hulls of equal size. The wide distance between a catamaran's hulls imparts stability through resistance to rolling and overturning; no ballast is requi ...

sailing dinghy Dinghy sailing is the activity of sailing small boats - usually for fun, learning necessary sailing skills (often also within family), and competition. RYA lists Five essentials of sailing dinghies as: * The sails * The hydrofoil, foils (i.e. t ...

that was designed by Frank Meldau as a

one-design One-design racing is a racing method which may be adopted in sports using complex equipment, whereby all vehicles have identical or very similar designs or models, avoiding the need for a Handicapping, handicap system. Motorsport One-make racing ...

racer and first built in 1962.Sherwood, Richard M.: ''A Field Guide to Sailboats of North America, Second Edition'', pages 68-69.

Houghton Mifflin Company Houghton Mifflin Harcourt Company ( ; HMH) is an American publisher of textbooks, instructional technology materials, assessments, and reference works. The company is based in the Boston Financial District. It was formerly known as the Houghto ...

, 1994. The design is the larger stablemate of the Cheshire 14 catamaran.

Production

The design is built by

Fiberglass Unlimited Fiberglass (American English) or fibreglass (English in the Commonwealth of Nations, Commonwealth English) is a common type of fibre-reinforced plastic, fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened i ...

(now called

Custom Fiberglass International Custom, customary, or consuetudinary may refer to: Traditions, laws, and religion * Convention (norm), a set of agreed, stipulated or generally accepted rules, norms, standards or criteria, often taking the form of a custom * Mores, what is wid ...

) in

Wake Forest, North Carolina Wake Forest is a town in Wake and Franklin counties in the U.S. state of North Carolina. Located almost entirely in Wake County, it lies just north of the state capital, Raleigh. At the 2020 census, the population was 47,601, up from 30,117 in ...

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

. A total of 710 have been built, and the design remains in production.

Design

The Isotope is a recreational

sailboat A sailboat or sailing boat is a boat propelled partly or entirely by sails and is smaller than a sailing ship. Distinctions in what constitutes a sailing boat and ship vary by region and maritime culture. Types Although sailboat terminology ...

, built predominantly of

fiberglass Fiberglass (American English) or fibreglass (English in the Commonwealth of Nations, Commonwealth English) is a common type of fibre-reinforced plastic, fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened i ...

. It has a fractional sloop rig, with

aluminum Aluminium (or aluminum in North American English) is a chemical element; it has chemical symbol, symbol Al and atomic number 13. It has a density lower than that of other common metals, about one-third that of steel. Aluminium has ...

spars, a sealed rotating mast and fully battened

mainsail A mainsail is a sail rigged on the main mast (sailing), mast of a sailing vessel. * On a square rigged vessel, it is the lowest and largest sail on the main mast. * On a fore-and-aft rigged vessel, it is the sail rigged aft of the main mast. T ...

, with eight ash wood or fiberglass battens. The hulls have spooned

raked stem The stem is the most forward part of a boat or ship's bow and is an extension of the keel itself. It is often found on wooden boats or ships, but not exclusively. Description The stem is the curved edge stretching from the keel below, up to ...

s, vertical transoms, transom-hung, kick-up

rudder A rudder is a primary control surface used to steer a ship, boat, submarine, hovercraft, airship, or other vehicle that moves through a fluid medium (usually air or water). On an airplane, the rudder is used primarily to counter adverse yaw ...

s controlled by a

tiller A tiller or till is a lever used to steer a vehicle. The mechanism is primarily used in watercraft, where it is attached to an outboard motor, rudder post, rudder post or stock to provide leverage in the form of torque for the helmsman to turn ...

and retractable, self-tending

centerboard A centreboard or centerboard (US) is a retractable hull appendage which pivots out of a slot in the hull of a sailboat, known as a ''centreboard trunk'' (UK) or ''centerboard case'' (US). The retractability allows the centreboard to be raised t ...

s. The hulls are joined with three cross-members. There are two stowage compartments, with hatches. The boat displaces and has flotation for positive buoyancy, plus a righting bar. The boat has a

draft Draft, the draft, or draught may refer to: Watercraft dimensions * Draft (hull), the distance from waterline to keel of a vessel * Draft (sail), degree of curvature in a sail * Air draft, distance from waterline to the highest point on a v ...

of with the centerboards extended and with them retracted, allowing beaching or ground transportation on a trailer. For sailing the design may be equipped with options such as a mast limiter,

roller furling Roller furling is a method of furling (i.e. reefing) a yacht's staysail by rolling the sail around a stay. Roller furling is typically used for foresails such as jibs or genoas. A mainsail may also be furled by a similar system, whereby the ...

jib A jib is a triangular sail that sets ahead of the foremast of a sailing vessel. Its forward corner (tack) is fixed to the bowsprit, to the bows, or to the deck between the bowsprit and the foremost mast. Jibs and spinnakers are the two main ty ...

and a

trapeze A trapeze is a short horizontal bar hung by ropes, metal straps, or chains, from a ceiling support. It is an aerial apparatus commonly found in circus performances. Trapeze acts may be static, spinning (rigged from a single point), swinging or ...

. The design has a Portsmouth Yardstick racing average handicap of 74.0. It is normally raced with a crew of one

sailor A sailor, seaman, mariner, or seafarer is a person who works aboard a watercraft as part of its crew, and may work in any one of a number of different fields that are related to the operation and maintenance of a ship. While the term ''sailor'' ...

although it can carry three people.

Operational history

In a 1994 review Richard Sherwood wrote, "sister to the Cheshire, the Isotope is two feet longer and five Portsmouth numbers faster."

References

External links

* {{Sailing dinghies and skiffs Dinghies Catamarans 1960s sailboat type designs Sailboat type designs by Frank Meldau Sailboat types built by Custom Fiberglass International Sailboat types built by Fiberglass Unlimited

Production

Design

Operational history

See also

References

External links