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It was created in 1855 as a variation of Builder's Old Measurement by the Royal Thames Yacht Club, and was designed for small vessels, such as yachts. It was originally used for calculating the port dues for yachts; the formula was also used in some early handicapping systems for yacht racing .
To sail the 470, good physical fitness but not too much physical strength is required. The optimal weight of the combined crew ranges between 110 and 145 kg, making it a suitable boat for men, women and youth teams. Due to various options for sail trimming one can sail the boat well at 1 to 6 Beaufort scale, slightly above by experienced teams.
Loadline displacement – The weight or mass of the ship loaded to the load line or plimsoll mark. Deadweight tonnage (DWT) is a measure of how much weight a ship can carry. [ 1 ] [ 2 ] [ 3 ] It is the sum of the weights of cargo, fuel, fresh water, ballast water , provisions, passengers, and crew.
The Radial uses the same hull and fittings as the Laser Standard, but has a smaller sail (5.8 m 2) than the Standard with a different cut, and has a shorter lower mast section. Optimal weight for this rig is 121 to 159 pounds (55 to 72 kg). The Laser Radial rig has a UK Portsmouth Yardstick number of 1150. [9] Its DPN is 96.7. [10]
The bottom mast section is pre-bent which effectively reduces the power of the rig, and the sail is only 4.7 square meters, as opposed to 7 for the Laser Standard or 5.7 for the Laser Radial. (ILCA 6) The smaller sail means that the 4.7 can be easily sailed by sailors weighing only 50–65 kg (110–145 lb), though this boat can still be sailed ...
This was equivalent to a Class 1 having to sail more distance than a Class 4 yacht during a race. In 1834 handicapping by distance was changed to handicapping by time. As yacht racing in particular became more and more popular designers started to look for and found loopholes in the measurement rules to enable a design to get a better rating.
Graphical representation of the dimensions used to describe a ship. Dimension "b" is the beam at waterline.. The beam of a ship is its width at its widest point. The maximum beam (B MAX) is the distance between planes passing through the outer sides of the ship, beam of the hull (B H) only includes permanently fixed parts of the hull, and beam at waterline (B WL) is the maximum width where the ...
It has a large sail-area-to-weight ratio, and is designed to plane easily. The 420 is an International class recognised by World Sailing . The name refers to the boat's length of 420 centimetres (4.2 m; 13 ft 9 in).
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