RLA · rope rescue systems

What does the anchor actually see?

Counting strands gets you TMA. It doesn't get you PMA, and it definitely doesn't get you the number that matters most for anchor selection. Pick a system and adjust the variables below.

Pulley efficiency 90%

Haul (input) force 50 lbf

Haul line redirected back through the anchor (CD pulley)

TMA 3.0:1

PMA 2.4:1

output force 122 lbf

force on the anchor 172 lbf