Main picture: the Bristol pilot cutter influence continues to make itself felt in some of the best-looking of the latest superyachts – a little display of yachting heritage can play well in the right context. Above clockwise from top left: 3D model of the hull door system – cutting an aperture of this size, particularly of this vertical depth in a long and relatively flat composite structure, is not something to undertake lightly. 75 per cent of the local freeboard is penetrated in the key bending area between the mast foot and forestay; the very considerable reinforcement and mechanics of the balcony/door to the owner’s cabin are well concealed; not a bad place to take your breakfast; door opening mechanism. This global FEA model (left) gives an insight into both global and local laminate behaviour


and challenges and with the mechanical systems now becoming an integral part of the structure, Gurit not only took respon- sibility for the composite design but also, with the Baltic Yachts team, the concept and preliminary design of the door mecha- nism itself, with Baltic Yachts’ in-house mechanical engineering team turning Gurit’s mechanism design into final fabri- cation drawings. The feasibility of a number of different concepts was investigated while keeping in


mind these primary considerations: l Firstly, the clearance between the top of the doorframe and the underside of the deck was very small, as little as 200mm, so space for mechanical devices in this area was very restricted. l Secondly, the number of devices should be minimised to limit complexity, weight and risk of mechanical failure. A solution was found that incorporated


structural hydraulically actuated hinges at the bottom corners, capable of transferring


axial and shear forces between the hull and the door, and transversely mounted hydraulically actuated pins in the upper corners which project into tight-fitting receptacles within the door. These four components have the effect of holding the four corners of the door and transferring the in-plane global loads in a way compar - able to a diagonal truss, while minimising the number of moving parts. Additional side-locking pins were incorporated into the sides of the door for watertightness but


SEAHORSE 53


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