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In Chapters 1.22-4-11 of his History, Polybius describes this device as a bridge 1.2 m (4 ft) wide and 10.9 m (36 ft) long, with a small parapet on both sides. The engine was probably used in the prow of the ship, where a pole and a system of pulleys allowed the bridge to be raised and lowered.
The stockless anchor is an improved version of the Admiralty anchor it is derived from. It has two flukes that pivot on the same plane perpendicular to the shank. [2] The weight of the shank and accompanying chain, or the shank angled under tension, keep the anchor laying flat on the sea floor.
A fairlead can be a hook, ring, pulley, chock, or hawse (hole) sometimes surrounded by rollers. If the line is meant to be moved while in the fairlead, the angle in the line created by the fairlead must be shallow to minimize friction. For larger angles a block or pulley is used as a fairlead to reduce friction. Where the line is removed from a ...
Holding ground is the area of sea floor that holds an anchor, and thus the attached ship or boat. [4] Different types of anchor are designed to hold in different types of holding ground. [5] Some bottom materials hold better than others; for instance, hard sand holds well, shell holds poorly. [6] Holding ground may be fouled with obstacles. [6]
As ships and their anchors grew in size, the anchor cable or chain would be too big to go around the capstan. Also, a wet cable or chain would be difficult to manage. A messenger would then be used as an intermediate device. This was a continuous loop of cable or chain which would go around the capstan.
The basic rode system is a line, cable, or chain several times longer than the depth of the water running from the anchor to the mooring buoy, the longer the rode is the shallower the angle of force on the anchor (it has more scope). A shallower scope means more of the force is pulling horizontally so that ploughing into the substrate adds ...
In sailing, a block is a single or multiple pulley. One or a number of sheaves are enclosed in an assembly between cheeks or chocks. In use, a block is fixed to the end of a line, to a spar, or to a surface. A line (rope) is reeved through the sheaves, and maybe through one or more matching blocks at some far end, to make up a tackle.
The killick hitch / ˈ k ɪ l ɪ k / is a type of hitch knot used to attach a rope to oddly shaped objects. [1]: 32 It is a combination of a timber hitch tied in conjunction with a half hitch [1]: 23 which is added to lend support and stability when pulling or hoisting the object.
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