Top: a second large aperture penetrates the hull further aft along the port side to allow easy access to the yacht along with a guest swimming platform and a means to put some of the smaller toys into the water. This second aperture is in a less heavily loaded area though global bending loads are still very substantial; next up on the Baltic Yachts’ menu of large-scale exotica is this Baltic 142 which employs DSS for flatter sailing, increased performance and pitch damping; even the launching involved its own FEA analysis
Engineering from mould to launch Pink Gin VI is constructed predominantly in Gurit Sprint and pre-preg carbon lami- nates on Corecell foam, with extensive use of high-modulus carbon unidirectional tapes for global stiffness. Gurit Composite Engineering also
worked closely with Baltic Yachts to deter- mine the build methodology for the boat. To maintain easy access to the interior during the build of the primary structure and installation of systems, the topsides were constructed separately and joined to the hull bottom and bulkheads only once the majority of the structure had been completed and installed. FEA techniques were also employed to
accurately simulate the curing of the top- sides to predict and minimise any deforma- tion that might have occurred during the curing process due to the differential shrinkage of inner and outer skins. Even the slightest deformation can cause big
problems for an installation when the top- sides are over 50m long. This proved to be very worthwhile with the finished topsides being within just 1mm of the designed shape over their entire length, resulting in a seamless installation. Extremely careful consideration was given to the lifting and handling of the topsides as well as a very detailed approach to the hull joint specifi- cation. This was to ensure that not only was structural continuity maintained, accounting for localised patching in the high-load areas such as around the hull door hinges, but also to avoid imperfec- tions that could affect the surface finish, ensuring that extra fairing of the female moulded hull was kept to the minimum. This project was a three-and-a-half-year
undertaking for Gurit Composite Engineer- ing and the team continued to provide support right up until the last moment, literally. With a full global FEA model the engineering team were able, as part of the
engineering process, to incorporate contact elements to simulate the launch of the vessel and ensure that the local hull stresses around the slings wouldn’t be excessive. However, on launch day Gurit were
advised that the slings could not be arranged in the way the yard had intended, resulting in a reduced sling width and contact area, and we were asked to provide authorisation to lift… Having this model to hand meant this was a question our engineering team were able to answer quickly and with confidence! The Gurit engineering team are incredi-
bly proud to have been involved in this innovative project. The novel door design, which at the time of writing is the subject of a patent application, has demonstrated for the first time in a sailing yacht that these features are now possible if the right approach is employed. Simon Everest, senior design engineer and project manager for Pink Gin VI
q SEAHORSE 55
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