Quote:
Originally Posted by Ether
Have you taken into account the effective winch diameter changing as the rope wraps around it?
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Yes, though it's partially based on the assumption that the strap we're using doesn't wrap exactly straight (which in our testing it typically does not). Even so, you need about an inch of extra strap wrapped up before it starts to cause problems.
If you don't mind the slower speed a 15:1 will give a more comfortable margin.