luffing jib tower crane 2
The "luffer" has 4 parts of line, which means there's a Mechanical Advantage of 4- so with a 100 load, you only need 1/4 or 25 pounds of muscle to lift the load .
www.hammerheadcranes.com
The "luffer" has 4 parts of line, which means there's a Mechanical Advantage of 4- so with a 100 load, you only need 1/4 or 25 pounds of muscle to lift the load .
www.hammerheadcranes.com
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