See full version: Folding mast for large sailing ship
Folding and unfolding a Corsair trimaran takes only a minute. With just 4 bolts to remove, it is easily managed by one person, and is normally done while afloat. Simply raise (to fold) or press down (to unfold) the inboard end of one cross beam. It can be done from the safety of the cockpit and only a little force is needed due to the folding system’s carefully balanced geometry, and the movement of the floats being mostly horizontal. here
Folding and unfolding a Corsair trimaran takes only a minute. With just 4 bolts to remove, it is easily managed by one person, and is normally done while afloat. Simply raise (to fold) or press down (to unfold) the inboard end of one cross beam. It can be done from the safety of the cockpit and only a little force is needed due to the folding system’s carefully balanced geometry, and the movement of the floats being mostly horizontal. here
The solid aluminium folding struts have absolute control over the folding motion and prevent flexing or racking. A stainless steel bolt on the inboard end of each beam secures the floats for sailing. Crucially, wingnets remain attached during the folding process – their frictionless fixing allows them to tension themselves appropriately through the folding process. The system is so simple and balanced that Corsair trimarans can even be folded while motoring.
Increase of size also made it impossible to construct each of these subdivisions out of single timbers. A distinction was made between whole or single-spar masts and armed and made masts. The first were used for the lighter spars, for small vessels and the Mediterranean craft called polacras. Armed masts were composed of two single timbers. isIade masts were built of many pieces, bolted and coaked, i.e. dovetailed and fitted together, fastened round by iron hoops, and between them by twelve or thirteen close turns of rope, firmly secured. [links]
The mast was for long made out of a single spar. Thence the Mediterranean name of palo (spar) and the Spanish arbol (tree). The typical Mediterranean mast of lateen (Latin) vessels is short and bends forward. In other classes it is upright, or bends slightly backwards with what is called a rake. The mast is grounded, or in technical language stepped, on the kelson (or keelson), the solid timber or metal beam lying parallel with, and above the keel. here
In June of 1899 Kaiser Wilhelm II visited the F. Laeisz company in Hamburg and was shown its flagship four-masted barque Potosi. At the end of the tour the Kaiser asked, "When do we see a five-masted ship?". Taking up the challenge, Laeisz commissioned the Tecklenborg yard in Gestemunde, Germany to build Preussen. The ship, launched in 1902, one of the last sail powered bulk cargo ship. The Preussen was then the largest and fastest sailing vessel ever built. The Royal Clipper sail cruise ship is the first fully rigged square-rigged ship with five masts since the Preussen. At 133.8 meters length the Royal Clipper is by far the largest true sail vessel afloat anywhere today.
By the close of the 16th century it had become the established rule that a ship proper had three masts fore, main and mizen. The third takes its name not as the other two do, from its place, but from the lateen sail originally hoisted on it, which was placed fore and aft in the middle (Italian, mizzo) of the ship, and did not lie across like the courses and topsails. here
The masts, including the bowsprit, support all the sails, whether they hang from the yards, which are spars slung to the mast, or from gaffs, which are spars projecting from the mast, or, as in the case of the jibs, are triangular sails, travelling on ropes called stays, which go from the foremast to the bowsprit and suspended by halliards. The bowsprit is subdivided like other masts.
In sketching the history of the development of the mast, it is important to distinguish between the increase in the number erected, and the improvements made in the mast itself. The earliest ships had only one, carrying a single sail. So little is known of the rigging of classical ships that nothing can be affirmed of them with absolute confidence. The Norse vessels carried one mast placed in the middle. The number gradually increased till it reached four or five. more
So, what are the parts of a sailing ship that are most important and why? This will be described below to give you a better understanding of what you need to consider before buying or building a sailboat. It is important to understand their significance for your safety and to avoid any unwanted accidents while having fun.
A strong hull- the hull of many boats is built strong to withstand the powerful force of the waves. In the case of a sail ship there is another feature that adds to the strain on the hull, namely the masts. They hold the sails thus exerting huge amounts of force on the hull. For the hull to be strong and not rupture while sailing, the hull needs to be reinforced around the mast area. more
It is imperative to use the best materials and methods to provide safety and durability for the sailor’s satisfaction. To do this as effectively as possible, the design must be directed toward certain components:
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1 meter = 3.28 feet. 1 foot = 0.3048 meter. 1 HP = 0.746 watts. 1 Kilowatt = 1.341 HP. LOA = Length over all.
You are welcome to mail for further information (if any), a ship 's location or an appointment direct with the owner
or his representative to inspect a vessel. You are invited to include your name, adress and telephone number.
All details and specifications are believed to be correct. Always subject to the buyer' s inspection and survey. more