Dart 18

The Dart 18 is a one-design 18-foot (5.5 m) long glassfibre sailing catamaran. It is designed to be sailed by two people and can achieve speeds of up to 20 knots. This is reflected in its Portsmouth Yardstick of 805[1] and D-PN of 76.3[2]

Dart 18
Class symbol
Boat
Crew2
Hull
Hull weight130 kg
LOA5480 mm
Beam2280 mm
Rig
Mast length8 m
Sails
Mainsail area12.92 m2
Jib/genoa area3.16 m2
Spinnaker area15.5 m2, not legal for racing
Racing
D-PN76.3
RYA PN805

History

The Dart 18 was designed in 1975 as a One Design Class by Rodney March, who was also responsible for the design of the Olympic Tornado class catamaran. The very first Dart 18, designed and built in Falmouth, Cornwall, is now owned by the National Maritime Museum Cornwall. Up to the present, a number of improvements have been made, but the original concept was preserved though strict class rules. More than 8350 boats have been built up to 2016, which are sailed in more than 16 nations on 4 continents. Since 2012, Windsport International holds the worldwide licence to build the Dart 18. The boats are manufactured since 2005 at Collins Fibreglass Plastics in South Africa and in Europe. The World Championship results can be found here.

Design

The hulls of the Dart 18 are similar to most sailing catamarans, but without centreboards. Instead, the lower part of the hulls have skegs typical for a beach catamaran. The hull material is glassfibre. Both hulls are filled with flotation inserts to preserve buoyancy in case of damage. The inside of each hull can be reached through a hatch cover located at the rear of each hull. The boat is assembled by attaching the main and rear beams to the hulls with spring-loaded retaining clips, and lacing the trampoline to the beams and hulls. The two rudders are removable without tools, retract on impact with the beach, and can be locked in the up position.

The rigging consists of a rotating mast held by a forestay and two shroud wires. The shrouds can be adjusted by simply moving the bolts in the chainplates. The Dart 18 mast does not have spreaders. There is a trapeze for the crew.

The mainsail does not have a boom, has nine full battens, and is controlled by a main sheet with a 7:1 mechanical advantage. The jib sail has two short battens, and is controlled by a jib sheet with a 2:1 mechanical advantage. The main sheet block and both jib sheet blocks have a ratchet and a cleat.

A gennaker sail can be added, but is not legal for racing. This is usually combined with a jib furling system. The boat can also be sailed by one person, without a foresail, with a D-PN of 78.7.[2]

gollark: I think for larger numbers you can use GMP bindings.
gollark: (not arbitrary-precision floats, I mean)
gollark: Python uses arbitrary-precision integers, though not floats.
gollark: Orbital bee strike inbound.
gollark: Fiiiiiine, general then.

See also

References
  1. "Portsmouth Number List 2013". Royal Yachting Association. Retrieved 16 August 2013.
  2. "Multihull Classes". US Sailing. Archived from the original on 16 August 2012. Retrieved 30 July 2012.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.