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http://www.hse.gov.uk/research/rrhtm/rr668.htm It is a large download but like I said it has tons of good information.

Murphy, have you ever read the rigging research done by the HSE in the UK? It's a few years old now but it has tons of useful information. Lots of real world/tree world testing. This is a page from it.

I think that this is worth repeating. All aspects involved in a rigging or climbing scenario need to be understood. Adding or subtracting a component based on stand-alone characteristics, may lead to misapplication.

Yes, especially since all the testing I have seen the half hitch/bowline combo fails at the half hitch.