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Rules of Thumb

 

Rigging

Steel Cable

"The design to go for, in a sheave carrying wire cable, is 40X the cable diameter. This is what we used to use for all shipboard sheaves where the cable had to have a long working life. Anything less than this figure and you reduce the working life of the cable. Going *much* less reduces the life really fast. So, 6mm should ideally have 240mm sheaves." --PDW

Also galvanized steel cable takes flexing better than stainless steel cable.