Meer infromatie is hier te vinden:
https://www.petzl.com/en/Sport/Fall-factor-and-impact-force—theory?ActivityName=Rock-climbing&l=US#.VrMpF3VgVQu
Meer infromatie is hier te vinden:
https://www.petzl.com/en/Sport/Fall-factor-and-impact-force—theory?ActivityName=Rock-climbing&l=US#.VrMpF3VgVQu