The J Class of racing yachts were built to the specifications of Nathanael Herreshoff's Universal Rule. The J Class is considered the apex of the era when the Universal Rule determined eligibility in the America's Cup.
With boats costing $10-20 million to build and yearly upkeep around $3 million, J Class racing has been described as the "most expensive hobby on Earth".
Bermuda rig, Bermudian rig, or Marconi rig is a type of sailing rig that uses a triangular sail set abaft (behind) the mast. It is the typical configuration for most modern sailboats. Whilst commonly seen in sloop-rigged vessels, Bermuda rig is used in a range of configurations, for instance, a cutter or a schooner (where it may be used in conjunction with gaff rigged sails on other masts), and several other types.
Bermuda rig takes its name from Bermuda, where it was developed in the 17th century. The term Marconi, a reference to the inventor of the radio, Guglielmo Marconi, became associated with this configuration in the early 20th century, because the wires that stabilize the mast of a Bermuda rig reminded observers of the wires on early radio masts.