A LOT of numbers
Big test today! After the last video on friction I filmed my testing of real world mechanical advantages. Our theoretical or ideal pulleysystems give us completely different efficiencies in real life. So time to test it out. After about 6 hours of filming the results are in and can be found on the website and at the end of the video. Cool stuff and there is definitely more testing to be done. And this should give you a broad idea of when to use a 3:1 or a 9:1 and what will actually change when you do.
Some more things happening behind the scenes. Besides the awesome opportunity I can give you with the LS3 discount code, I am working on another one with Vrigger. Those great images I overlay to clarify the rigging. Stay tuned for that, it won’t be long
Results
These results make it very clear. Our systems are not as efficient as they appear to be. Sometimes it is only the direction of pull that makes it feel lighter, sometimes the fact that we get a progress capture in there that is easy to release maybe an advantage we need.
Now what you make or use does not really matter. The most important thing now, with this knowledge, is that you can make a conscious decision on why you do something. Principles versus Methods 😉
Video’s mentioned in this video:
Friction:
https://youtu.be/uq7AhJYXOQ4
Hauling Systems:
https://youtu.be/V2JiHZJClgQ
F9 vs F8 The FINAL Showdown:
https://youtu.be/KsZgZB3oPbc
Welcome video where I explain the philosophy behind The Rope Access Channel
https://youtu.be/x8vy50kzIsM
Buy me a coffee on Patreon:
This video was filmed at Industrieel Klimmen:
Industrieel Klimmen –
Your one stop shop for all things rope access and climbing. Also here I have been able to get you a nice little discount.
Use coupon code: TRAC at checkout for a €20,- discount with any purchase of over €100,-
Connect on:
Website: https://www.theropeaccesschannel.com
Email: connect@theropeaccesschannel.com
Instagram: https://www.instagram.com/theropeaccesschannel/
Twitter: https://twitter.com/theropeaccessc
Facebook: https://www.facebook.com/theropeaccesschannel/
LineGrip LineScale 3:
Follow the link below to get yours and support the channel:
https://www.linegrip.com/?ref=TRAC
A revolutionary digital all-in-one bluetooth dyno / load cell. PPE certified, 1280Hz fast, 30kN WLL, and unique onboard-logging of up to 50 hours. The huge load eyes and 90kN breaking strength make it perfectly suited as a generous master point for any type of rigging challenge.
LS3 Affiliate discount code:
Use code TRAC-61c-Tg3 on checkout to get 2,5% discount!!
Use for any purchase on Linegrip and support the channel
I use Tubebuddy to manage this channel:
https://www.tubebuddy.com/LXB
Chapters
0:00 Intro
0:20 Why and how do we test
1:38 Baseline Test
3:20 Test 1 – 3:1 I’d Biner
5:53 Test 2 – 3:1 I’d Small Pulley
6:30 Test 3 – 3:1 I’d Rescue Pulley
7:23 Test 4 – 3:1 Pro Traxion into biner
8:30 Test 5 – 3:1 Pro Traxion into pulley
11:02 Test 6 – 3:1 CD I’d all biners
12:30 The T-Method to calculate MA’s
13:30 Test 7 – 3:1 CD I’d one biner as CD
15:16 Test 8 – 3:1 CD I’d pulley as CD
16:25 Test 9 – 3:1 CD I’d all pulley’s
17:22 Test 10 – 3:1 CD Pro Traxion all pulleys
18:45 Linegrip LS3 deal
20:22 Test 11 9:1 CD I’d all biners
22:17 Test 12 9:1 CD I’d Biner as CD
24:36 Test 13 9:1 CD I’d biner at pulling rope clamp
25:40 Test 14 9:1 CD Pro Traxion all pulleys
27:00 Final test 15 3:1 with mystery device
2 Responses
Hi Alex! Thanks for your effort making these videos. It helped me a lot understanding how pulley systems work. Keep doing awesome work!
I have small comments though.
I’m not 100% sure but i’ve noticed problems with the experiment.
First one is the misplacement of “Grab” LS3. It did not measure the force of whole system. In the video it measures 2:1 subsystem on z-rig and 6:1 subsystem on 9:1 rig. It should be placed between the load and the last line clamp.
Second one is slightly wrong actual MA calculation. In video the AMA is calculated as ratio between value from “Grab” and benchmark value. It should be calculated as ratio of output to input on the same rig. For example: in last measurement it should be 100/65 = 1.5 AMA
Hi Kamil, thank you for your comment
With regards to your first comment, I think the only one that is important is the clamp or LS3 where the winch is pulling on. The other LS3 is more to get an idea of how much friction is lost in the system.
And to your second point it is like this:
It takes 118 kg to move the load in a 1:1 setup (can’t remember the specific number so lets taken 120 for ease of calculating).That is because the very first redirect pulley in the ceiling creates friction as well.
If I build a pulley system (for instance an ideal MA of 6:1) where it then takes me 40 to move the load the Actual MA is 120/40= 3:1. That is because I am essentially lifting 120 because of the very first pulleys after the load.
Do you see what I mean?