The US1, sometimes written US 1, is an American

sailing dinghy Dinghy sailing is the activity of sailing small boats by using five essential controls: * the sails * the foils (i.e. the daggerboard or centreboard and rudder and sometimes lifting foils as found on the Moth) * the trim (forward/rear angle o ...

that was designed by Ralph Kuppersmith and Clark Mills as a one-design racer and first built in 1973.Sherwood, Richard M.: ''A Field Guide to Sailboats of North America, Second Edition'', pages 56-57. Houghton Mifflin Company, 1994. The design is most likely a

catboat A catboat (alternate spelling: cat boat) is a sailboat with a single sail on a single mast set well forward in the bow of a very beamy and (usually) shallow draft hull. Typically they are gaff rigged, though Bermuda rig is also used. Most are fi ...

-rigged derivation of the Mills-designed

Windmill A windmill is a structure that converts wind power into rotational energy using vanes called sails or blades, specifically to mill grain (gristmills), but the term is also extended to windpumps, wind turbines, and other applications, in some ...

of 1953.

Production

The design was initially built by Kuppersmith's company, the Advance Sailboat Corporation of

Parkville, Missouri Parkville is a city in Platte County, Missouri, United States and is a part of the Kansas City Metropolitan Area. The population was 7,177 at the 2020 census (2021 est, 7,810). Parkville is known for its antique shops, art galleries, and hist ...

and later of

Independence, Missouri Independence is the fifth-largest city in Missouri and the county seat of Jackson County. Independence is a satellite city of Kansas City, Missouri, and is the largest suburb on the Missouri side of the Kansas City metropolitan area. In 2020, ...

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...

. That company went out of business in 1980 and the boat design was then built by Continental Sailcraft. A total of 450 boats were completed, but it is now out of production.

Design

The US1 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 terminolo ...

, built predominantly of

fiberglass Fiberglass (American English) or fibreglass ( Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass clo ...

. It has a catboat rig with a loose-footed

mainsail A mainsail is a sail rigged on the main 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. The sail's foot i ...

and foam-filled

aluminum Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It ha ...

spars to reduce the risk of turtling. The hull features a rounded foredeck, a

plumb 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 t ...

, a vertical transom, a transom-hung, kick-up

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

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 or stock to provide leverage in the form of torque for the helmsman to turn the rudder. ...

and a retractable centerboard. It displaces . 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 vesse ...

of with the centerboard extended and with it retracted, allowing beaching or ground transportation on a trailer or car roof rack. For sailing the design is equipped with a dual

Cunningham Cunningham is a surname of Scottish origin, see Clan Cunningham. Notable people sharing this surname A–C * Aaron Cunningham (born 1986), American baseball player *Abe Cunningham, American drummer * Adrian Cunningham (born 1960), Australian ...

and an

outhaul An outhaul is a control line found on a sailboat. It is an element of the running rigging, used to attach the mainsail clew to the boom and tensions the foot of the sail. It commonly uses a block at the boom end and a cleat on the boom, closer ...

. The class rules allow specific modifications to the boat, including the installation of two bailers, centerboard gaskets, four inspection ports, changes to the sheeting, the

boom vang A boom vang (US) or kicking strap (UK) (often shortened to "vang" or "kicker") is a line or piston system on a sailboat used to exert downward force on the boom and thus control the shape of the sail. The Collins English Dictionary defines it ...

, the Cunningham,

mainsheet traveler A traveller is a part of the rigging of a boat or ship that provides a moving attachment point for a rope, sail or yard to a fixed part of the vessel. It may take the form of anything from a simple ring on a metal bar or a spar to, especially in a ...

, outhaul, as well as the rudder and tiller and the centerboard control lines. At one time the class rules allowed the use of a three-piece mast as an alternative to the standard two-piece mast, but this change was repealed. The design has a

Portsmouth Yardstick The Portsmouth Yardstick (PY) or Portsmouth handicap scheme is a term used for a number of related systems of empirical handicapping used primarily in small sailboat racing. The handicap is applied to the time taken to sail any course, and the han ...

racing average handicap of 91.5 and is normally raced with a crew of one or two

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. The profession of the s ...

s, who are limited by the class rules to total weight.

Operational history

In 1994 there were active fleets racing in

Missouri Missouri is a state in the Midwestern region of the United States. Ranking 21st in land area, it is bordered by eight states (tied for the most with Tennessee): Iowa to the north, Illinois, Kentucky and Tennessee to the east, Arkansas t ...

Ohio Ohio () is a state in the Midwestern region of the United States. Of the fifty U.S. states, it is the 34th-largest by area, and with a population of nearly 11.8 million, is the seventh-most populous and tenth-most densely populated. The sta ...

Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...

and

Texas Texas (, ; Spanish: ''Texas'', ''Tejas'') is a state in the South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2020, it is the second-largest U.S. state by ...

References

{{Sailing dinghies and skiffs Dinghies 1970s sailboat type designs Sailboat type designs by Ralph Kuppersmith Sailboat type designs by Clark Mills Sailboat types built by Advance Sailboat Corporation Sailboat types built by Continental Sailcraft

Production

Design

Operational history

See also

References