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The dimensions of the boats must conform to the America’s Cup Class Rule, a mathematical formula, which is the function of length, beam, draft displacement and sail area.
It follows that increases made in one area must lead to decreases in another. The trend is for heavy, narrow boats which are faster upwind.
The building process begins with the designers sketching various ideas on computer, aided by sailing data and computational fluid dynamics programmes. Scale models are then built and tank tested to analyse performance.
Once the design has been agreed, the hull is built in a mould. Materials used for the hull and deck gear include carbon, Kevlar, titanium, glass fibre, aluminium and steel.
GBR Challenge's Wight Lightning took a 30-strong team 24,000 man hours to complete.
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