Friction Hitches





Petzl Understanding Fall Force Force unit conversion Calculator
Petzl Fall Calculator-Rope Perimeter & Area of Shapes Formulas
Simple Rope Fall Force Calculator Green Log Weight Chart at Sherrill
Impact from FreeFall Calculator  

General: Martindale all kinds of Sports Calculators


Spreadsheets below initiated by Dave Spencer VericalPro.Net while visiting the TreeBuzz.Com discussion forum.  
Leveraged Force Calculator for Bent Line (or any Flexible Devices)  
Leveraged Force Calculator for Length, Height and Lean of Tree (or any Solid Devices)  
Leveraged Forces in Rope and Supports Calculator for Double Whip Tackle