Dart 18

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Current Specifications
Dart black.svg
Class Symbol
Crew 2
LOA 5480 mm
Beam 2280 mm
Hull weight 130 kg
Mast height 8 m
Mainsail area 12.92 m2
Jib / Genoa area 3.16 m2
Spinnaker area 15.5 m2, not legal for racing
D-PN 76.3
RYA PN 805

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]

History[edit]

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 8300 boats have been built up to 2013, which are sailed in more than 16 nations on 4 continents. Since 2012, Windsport International holds the worldwide license 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[edit]

The hulls of the Dart 18 are similar to the 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]

Dart start3.jpg

References[edit]

  1. ^ "Portsmouth Number List 2013". Royal Yachting Association. Retrieved 16 August 2013. 
  2. ^ a b "Multihull Classes". US Sailing. Retrieved 30 July 2012. 

External links[edit]