Excellent all round, multi-purpose functionality.Excellent for high static loads – blocks with bearings will run faster under light load and cope much better with fine tuning adjustment under extreme load.Cost effective - reasonably priced compared with ball bearing or roller bearing blocks.The sheave rotates directly on a simple axle pin which may have a load bearing bush - sheaves have a groove designed to sympathetically accept rope or wire and are machined from nylon, aluminium alloy, brass or similar materials.Simple construction with only one moving part, the least possible to construct a serviceable pulley.The picture shows a Barton plain bearing block, a sheave with a bush fitted and a sheave with no bush The bush that bears the load is the origin of the term Plain Bearing. The sheave (pulley wheel) may have a load bearing bush, also known as a bushing or sleeve bearing.Ī bush is added to reduce friction and resultant wear. the transverse pin between the cheeks of the block Plain bearing actually means that the sheave rotates directly on a simple central axle i.e.
#Rigging with rope and snatch blocks full#
Things have gone full circle with the advent of the modern-day low friction ring equivalent. lignum vitae with carefully grooved holes through it. The plain bearing block, mainstay of the running rigging on a cruising yacht, is developed from the traditional dead eye which has no moving parts and originated as a piece of hardwood e.g. The main characteristics of each type of block are explained below. Over centuries, new developments in technology have advanced the design of sailing blocks to become faster and smoother, stronger, and more dynamic in their specific use depending on the task at hand. Blocks have many uses from the simple hoisting of flags to hoisting or controlling heavy sails. Onboard a yacht or boat, the pulleys have specific names depending on the task.
The pulley or block is used to lift or lower heavy objects and facilitate the smooth change in direction of a rope or wire. The axle is also known as the pin, bush or bearing. The wheel may also be called a drum and is commonly referred to as a sheave. The wheel has a groove in it and the rope or wire sits in the groove. The term ‘Block’ (also known as a pulley) refers to a manufactured part incorporating a wheel and an axle, which allows the wheel to rotate. Here is a real beginner’s guide to sailing blocks.
Sailing Blocks are used for a variety of purposes onboard a yacht or sailboat.
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