How to make a compound pulley system can be very simple.. Just put a simple on a simple pulley system.. See what I did there 😉. In this video we get into the three most used compound pulley systems. Of course there are countless variations possible. I will also demonstrate why using a compound pulley system may not be what you need.
The answers to last weeks quiz can be found on this post on http://www.theropeaccesschannel.com:
https://www.theropeaccesschannel.com/this-is-how-simple-pulley-systems-work-rope-access-rigging/
Check out the first comment.
This weeks quiz is:
Question A
Question B:
Question C:
Answers:
The answers to the quiz will be in the top comment below
Video’s mentioned:
THIS is how simple pullesystems work
https://youtu.be/yRSGnE9aTi0
Is this really efficient:
https://youtu.be/sIMFvf_E5Y8
Crash:
https://youtu.be/6XsJwv-kGBU
Welcome video where I explain the philosophy behind The Rope Access Channel
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Chapters
0:00 Intro
0:18 Recap Simple Pulley System
0:32 Drawing out a Compound Pulley System
2:30 Compound Pulley System
5:40 Switching the compound pulley system around
9:00 The DISADVANTAGES of a compound pulley system
16:00 Get VRigger with a DISCOUNT
17:15 Quiz time
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One response
Allright, the answers are…..
A) It is a 3:1with a CD (blue rope) pulling on a 5:1 (black rope). And we learned that with a compound system, we simply identify the simple systems within the compound one and multiply. 3 x 5 = 15:1
B) By adding a 3:1 in parallel, we do not change the MA. We can see that by looking at the speed of the load. It will remain the same to a single 3:1. Arguably we could make it heavier if we take friction into account….
C) This is actual a MA to DISadvantage. A 1:2. We need to pull twice as hard. Our 1:1 CD is pulling on a 1:2. If we pull down 1 meter, the load will go up 2 meters. So we use this to get thing moving real fast quickly. Yes we need to put in twice the effort, and that pays itself off in cool looking stunts in movies for instance.
If you turn it upside down you can the 2:1 clearer maybe?