Pulley Systems - Flaschenzug

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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


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