Year: 2009 Language: english Author: A. Shenoi et alli Genre: Research papers Format: PDF Quality: eBook Pages count: 61 Description: The history of yachts goes back a long way. The first appearances were in the 1600’s when wealthy Dutch merchants built and sailed small and relatively fast boats called “jacht” especially for pleasure. The real building and use of yachts sprung into life at the end of the 1800’s. In the context of the present report we will restrict our self to the period starting a little before the Second World War up to the present day. Originally “jachts” were built in wood and in construction quite similar to what was customary in the normal shipbuilding of that time. The hull was single (massive) planking connected to closely spaced wooden frames. The frames were connected to wooden floors and those to the bottom planking. In the early days many yachts still had flat or slightly curved bottoms. At the upper side the frames were connected to the deck beams on which the deck planking was laid. Longitudinal stringers were mostly absent. Later when yachts got keels the construction changed. The sections became rather more V shaped asking for different construction techniques. The stem beam, the keel beam and the stern beam were introduced, which functioned also as longitudinal stiffeners, to which the frames were connected, which in turn were connected by the floors. The difficulties and weaknesses in the available connecting techniques of that time however posed a serious limit on the achievable overall strength and in more in particular the overall rigidity of the yacht hull structure. All wooden construction was only to return in yacht building after the 1970’s, when new and serious bonding techniques became available, such as the epoxy resins, together with new wood laminating techniques. So in the 1930’s the new “composite” construction technique came into force, in which the keel, stem, stern, frames, beams and floors were all constructed in steel (and bolted or riveted, later welded together) to which the still wooden hull and deck planking was connected. This was a big improvement but still rather heavy.
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Sailing Yacht Design
Language: english
Author: A. Shenoi et alli
Genre: Research papers
Format: PDF
Quality: eBook
Pages count: 61
Description: The history of yachts goes back a long way. The first appearances were in the 1600’s when wealthy Dutch merchants built and sailed small and relatively fast boats called “jacht” especially for pleasure. The real building and use of yachts sprung into life at the end of the 1800’s. In the context of the present report we will restrict our self to the period starting a little before the Second World War up to the present day.
Originally “jachts” were built in wood and in construction quite similar to what was customary in the normal shipbuilding of that time. The hull was single (massive) planking connected to closely spaced wooden frames. The frames were connected to wooden floors and those to the bottom planking. In the early days many yachts still had flat or slightly curved bottoms. At the upper side the frames were connected to the deck beams on which the deck planking was laid. Longitudinal stringers were mostly absent.
Later when yachts got keels the construction changed. The sections became rather more V shaped asking for different construction techniques. The stem beam, the keel beam and the stern beam were introduced, which functioned also as longitudinal stiffeners, to which the frames were connected, which in turn were connected by the floors. The difficulties and weaknesses in the available connecting techniques of that time however posed a serious limit on the achievable overall strength and in more in particular the overall rigidity of the yacht hull structure. All wooden construction was only to return in yacht building after the 1970’s, when new and serious bonding techniques became available, such as the epoxy resins, together with new wood laminating techniques.
So in the 1930’s the new “composite” construction technique came into force, in which the keel, stem, stern, frames, beams and floors were all constructed in steel (and bolted or riveted, later welded together) to which the still wooden hull and deck planking was connected. This was a big improvement but still rather heavy.
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