an assembly of blocks with a rope threaded through the pulleys is called tackle. a block and tackle is characterized by the use of a single continuous rope to transmit a tension force around one or more pulleys to lift or move a load. therefore, the mechanical advantage of a double tackle is 4. the mechanical advantage of any tackle can be increased by interchanging the fixed and moving blocks so the rope is attached to the moving block and the rope is pulled in the direction of the lifted load.
the tension in the rope is w/3 yielding an advantage of three. reeving to advantage is the most efficient use of equipment and resources. in order to raise a block and tackle with a mechanical advantage of 6 a distance of 1 metre, it is necessary to pull 6 metres of rope through the blocks.
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a block and tackle or only tackle is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads. shop, read reviews, or ask questions about hook & tackle at the official west marine online store. since 1968, west marine has grown to over 250 local discover new fishing tackle and outdoor gear at great prices. karl’s offers a wide assortment of bass and products from todays top tackle brands., .
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