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Here's a link to a thread where we explored some of these ideas. Might be worth a perusal. https://www.masterblasterhome.com/showthread.php?12254-How-big-can-you-go

:thumbup:

For myself, I've looked up on the log weight charts some basic general size/weight categories I keep in my mind, for the species I commonly work with. I interpolate from there.

Another thing to remember is to calculate the loads when negative blocking bearing in mind the exponential increase as distance from the block to the COG of the piece gets longer.

Not a bad rule of thumb, Eric. Either way though, always keep cycles to failure in mind...if you keep loads well under SWL limit for the weakest link (which should be the rope, I'm sure we all agree) you extend the number of safe cycles.