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www.sname.org/sname/mt April 2013 with a code zero it is furled around the support torque rope and then lowered like a spinnaker. Torque ropes are special ropes designed to provide much more torsional rigidity than a typical rope to enable the sail to be furled. e use of advanced ber composites, such as carbon ber, in the rigs of super yachts has greatly reduced the weight of the rigs enabling the boats to have more stability and make the moving parts safer. Carbon and other advanced bers are used both in the solid laminate constructions such as mast and booms, but are also used for the standing and running rigging. Sails are usually made from exible laminates that minimize weight by concentrating load-bearing bers only where they are needed. How large? e 101 m sloop that is about to go into construction is prob- ably getting close to the limits of todays technology for single masts. e mast will be more than two times longer than the Boeing 787 Dreamliners wingspan. MTTyler Doyle is president of Doyle CFD, a consulting company specializing in CFD- and FEA-based analyses and design. The results from a detailed upwind load analysis show at what wind speed di erent trim con? gurations can safely be used.