5 Rules to Help Determine Simple & Compound Mechanical Advantage Systems

Written By: Peak Rescue Institute

From Rigging Lab Academy Course Mechanical Advantage Theory

There are three categories of mechanical advantages using pulleys: SimpleCompound, and Complex.

  1. Simple MA: A Simple MA consists of a pulley system that has a single haul connection between the load and the haul team.
  2. Compound MA: A Compound MA is a simple mechanical advantage system pulling on the haul line of another simple mechanical advantage. Multiplying the two systems will give the total advantage.
  3. Complex MA (see more below)

5 Rules to Help Determine Simple & Compound Mechanical Advantage Systems:

There are five rules that can be used to determine simple and compound mechanical advantage systems.

  1. Rule #1: If the pulley closest to the haulers is on the anchor, the pulley is only considered a change of direction (cd). The same rule applies to ANY pulley system.
  2. Rule #2: If the rope used in the pulley system is tied to the anchor, the ideal mechanical advantage (IMA) will be EVEN (i.e., 2:1, 4:1. 6:1, etc.)
  3. Rule #3: If the rope used in the pulley system is tied to the load, the ideal mechanical advantage (IMA) will be ODD (i.e., 1:1, 3:1. 5:1, etc.)
  4. Rule #4: To determine the IMA of a simple pulley system, count the ropes between the anchor and the load. Do not count the ropes between two anchors.
  5. Rule #5: A simple MA pulling on the haul line of another simple MA is called a compound MA system.

Apply all this crazy technical knowledge and get some free courses as well... 
Twin Tension Rope Systems & Artificial High Directional Trilogy

What is a Complex MA?

A Complex MA system is neither simple or compound, and the above rules will not work in determining the system. The only way in determining the mechanical advantage of a complex MA system is by calculating the “tension units”. See “Critical Thinking On Mechanical Advantage Systems” at the end of this section for further details.

The combinations of pulleys that can be incorporated in an MA system are infinite. With this in mind, how many pulleys are needed, and what are the characteristics of a quality haul system?


[thrive_lead_lock id=’51985′]Hidden Content[/thrive_lead_lock]


Peace on your Days



About The Author:

24 thoughts on “5 Rules to Help Determine Simple & Compound Mechanical Advantage Systems”

  1. Hello! I could have sworn I’ve been to this blog before but after browsing through some of the post I realized it’s new to me. Anyways, I’m definitely happy I found it and I’ll be book-marking and checking back frequently!

  2. 794064 826868The vacation trades offered are evaluated a variety of in the chosen and merely excellent value all about the world. Those hostels are normally based towards households which you will find accented via charming shores promoting crystal-clear fishing holes, concurrent of ones Ocean. Hotels Discounts 579634

  3. Pg Slot ให้บริการเกมสล็อตออนไลน์บนโทรศัพท์ที่มีเกมให้เลือก เป็นเกมรูปแบบใหม่ที่ทำเงินให้ผู้เล่นได้เงินจริงการเล่นเกมง่าย มีแนวทางสอนการเล่นเกมสล็อตออนไลน์สำหรับมือใหม่

  4. 340108 916893This site is often a walk-through like the information you wanted in regards to this and didnt know who to question. Glimpse here, and you will certainly discover it. 754434

  5. Fantastic day, I’ve browsed most in your posts. This create-up is more than likely through which I been given definitely the most valuable data for my exploration. Numerous thanks for putting up, Most likely we can certainly see further on this. Will you be conscious of almost every other Website-sites on this subject material.https://in1.bet/

  6. you’re really a good webmaster. The website loading speed is incredible. It seems that you’re doing any unique trick. Furthermore, The contents are masterpiece. you have done a great job on this topic!

  7. Maintain The great function; I go through numerous posts on this Online web-site, which incorporates I keep in mind that the web site is intriguing and it has sets Along with the excellent piece of knowledge. Several thanks as part of your effective makes an attempt.

  8. Exceptional post. I used to be often inspecting this Web-site, And that i’m amazed! Notably handy aspects specifically the final facet, I look after this kind of knowledge a good offer. I was Getting this distinct information for an exceedingly long time. Due to This page my exploration has finished.

  9. You might have completed a great occupation on this information. It’s very distinct and massively qualitative. You could have even managed to actually make it readable and easy to undergo. You’ve some authentic composing talent. Thank you a fantastic offer.

  10. hey there and thank you for your info – I have certainly picked up anything new from right here. I did however expertise several technical points using this website, as I experienced to reload the website many times previous to I could get it to load correctly. I had been wondering if your web hosting is OK? Not that I am complaining, but slow loading instances times will often affect your placement in google and can damage your quality score if advertising and marketing with Adwords. Well I am adding this RSS to my email and could look out for a lot more of your respective intriguing content. Make sure you update this again soon..

Comments are closed.