The connection of the keel to the hull

curtainsThe connection of the keel to the hull is very dependent on the type of yacht under consideration although some elements remain. With the traditional long keel under the wooden hull a clear distinction between hull and keel is not easy to make.

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High tech sailing yachts

odessaFor the really high tech sailing yachts, constructing the keel from one material throughout is not strictly necessary. The fin is considered to be the wing producing side force and holding the ballast weight down.

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New developments in rudder layouts

ledNew developments in rudder layouts may be found in the application of twin rudders. They are typically applied on boats with beamy aft sections. These boats would lift the centreline rudder out of the water to a considerable extent when heeled.

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Analysis of the factor loadings

Iyachts-loadingt should be underlined that, in the last decade, significant progress has been made in the field of aerodynamic and hydrodynamic load analysis, thanks to some prestigious international competition such as the America's Cup and Admiral's Cup. Many problems related to the forces generated by sails have been faced by developing powerful numerical software able to take into account a large number of geometric and physical variables. Nevertheless some problems remain like, as an example, the behaviour of rigging under wind gust, the dynamic loading on the mast caused by the boat movements in rough sea and the pretensioning loads induced by initial rigging trim.

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The top of the mast

boat-tripsThe top of the mast is tapered cutting a strip of material from the side of the profile of increasing width. Then the two edges are welded together obtaining a decreasing section towards the masthead. This simple procedure allows a reduction in weight and makes the top of the mast more flexible.

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