Optional jib: 49 sqft.

Features a free standing, rotating cat rig with fiberglass mast.

Australian designed ‘A’ class that trounced the competition at the 1967 IYRU selection trails for a new single handed catamaran. Almost immediately it was granted international status and licenses were granted to a number of builders around the world. However, the class never achieved any wide spread popularity and the International designation was withdrawn in 1973.

Hull width: 1.75′
Approx. all up weight: 120 lbs.

The DN is the largest iceboat class in the world, so named because it was the winner of an iceboat design contest sponsored by the Detroit News in 1937. First called the BLUE STREAK 60. (60 sq. ft. meas. SA)
It’s unknown how many have actually been built, but The IDNIYRA currently (2007) has about 2000 members (1000 in North America and 1000 in Europe), representing 20 countries. A World Championship is held each year, with the site alternating between North America and Europe. There are also North American and European Championsips held each year, as well as numerous other international and local regattas.

Sailed as a sloop or cat rig.
Sail area with jib: 160 ft²
Single centerboard connected to aft beam.

C CLASS CATAMARAN rule began with the creation of the International Catamaran Challenge Cup, first sponsored, in 1960, by the Sea Cliff Yacht Club, located in Long Island, NY USA. The event, loosely called the Little Americas Cup, continues to this day, although only intermittantly in recent years. Among development classes, it is recognized as one with the fewest restrictions. Boats that are built to the C Class rule are among the most advanced and fastest sailboats in the world for closed course racing.
Restrictions are as follows:
A crew of 2.
Maximum LOA is 25’.
Maximum Beam is 14’.
Maximum Sail Area is 300 sq feet. (For the past 20+ years, the sails have been multi element solid wings with varying methods of control)
There is no restriction on weight or design of foils.
The photo is of the US boat ‘Cogito’. Photo by Elizabeth B. Wrightson.

Also called NACRA 18M2.
Designed for maximum length, beam (11′) and SA allowed by the single handed 18 Sq. Meter ‘box’ rule which had been recently established at the time. (NACRA’s version was introduced first using the standard hulls of the NACRA 5.2. Later (1983?, updated with a new, full length, hull design.(18′)
Another NACRA 5.5 (non-18SM) was available with the same hulls, less beam and a sloop rig.
The NACRA 5.5 (18sm) shown here has the boom (gooseneck) attached to forward beam.
This was replaced in the mid 1980’s with a newer NACRA 18sm with the updated 5.5m hulls and boomless rig.

Original version can be rigged as sloop or cat (Jib Kit and Spinnaker Kit are options.) The drawing depicts the ‘Club’ version with optional masthead float.
Very popular at resorts partly because of it’s rugged roto-molded construction.