In reply to ashley1_scott:
> (In reply to Keiran.A)
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> It might be me being stupid but, if the breaking strength is 10kN and you are putting any kind of knot in it, it lowers the breaking strength. Hence why people say that a Fo8 knot is safer then a Bowline, as a Fo8 retains 80% of the ropes strength but a Bowline only retains 75%.
He has already assumed the df decreases the strength of cord by 25%.
The difference between 75% and 80% is 1/20th of your full strength. That's not much reason to chose one knot over another. As far as tie in knots go, the reason people shun the bowline is mostly because the FoE is thought safer for non-strength related reasons (no stopper needed, last thread can be skipped, more familiar)