Abbreviations: A ... Anchor (e.g. tree) w ... Weight (e.g. slackline) T ... Tension Br... Resetable Brake
How to arrange the rope pulleys the best way? These are some basic and easy pulley systems to setup a slackline. Let's assume you are able to pull with a force of T. Depending on which of the following pulley systems you use, the slackline has a tension of four or five times T.
5:1 A
4:1 A T
2T
2T T
T T
2T
2T Br T
5:1 A
T T
T T
T T
2T
2T
T
T 2T
Br T
2T
T
T
T
2T
2T
5T
w
w
T
T
5T
4T
Br T
T
T
2T
T T
T T
T T T
2T
2T
w
How much force is on the brake? When you stop pulling the brake should hold the tension of the slackline. The force on the system - caused by "w" - is still the same as it was when you were pulling with a force of T.
T
T T
T T
T T
2T
2T
Br
2.5T
2.5T
1.25T 1.25T 1.25T 1.25T
T
^1 T = / 4 Fw
2T
1.25T
4T w
2.5T 5T w
2T
2T
T T
T T Br T 1.25T ^ = 1/ 4 F w
1/ ^ = 5 Fw T
T
T
T T
T
2T
Br
2T
5T w
What does this mean? You can tighten the slackline with... 4x
5x
The brake has to be able to hold... 1/ 4
5x ... times of your strength.
1/
1/ 5 ... of the slackline tension.
4
tlins