engleski

Ballast keel strength assessment of a racing sailing yacht

Ballast keel is a hull appendage which is crucial in achieving the sailing yachts performance. The main function of the keel is to ensure stability, maintaining the ship's angle and speed, with the most important characteristics the shape and weight of the keel. Modern sailboats have keel-shaped fins, which are often used on cruisers as provide good performance and are relatively cheap and simple in design. In order to achieve the best or optimal performance, racing sailing yachts are designed and constructed with longer, slender and heavier keels with bulb. Therefore, during design process special attention should be paid to shape and weight selection as well as to provide required stiffens and strength. Within the paper, design approach is presented on keel and bulb parameters selection and calculations such as geometry, mass and centar of gravity. For the two proposed structural models, first with L-bulb and second one with T-bulb, strength calculation is presented according to ISO-12215 rules. Special attention is paid to keel to hull connection, i.e. screws dimension calculation and selection. Finite elements global strength analyses of the keel internal structure is performed for the both of the structural models. Presented results, in form of deformations and stresses are discussed and are within allowable limits.

racing sailing yacht; ballast keel; FEA

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