Mechanical Advantage is a Myth

We all know friction in a mechanical advantage block and tackle pulley systems can reduce output, but I haven't heard anyone talk about stretch. I am always using semi static or climbing ropes, which have a lot of stretch. We test all the way up to a 13:1 with dynamic, semi static and 0 stretch dyneema. We did NOT use multipliers or brakes to simplify this already long experiment. *All numbers are in kN. Trying to keep a lot of data easy to look at! ►►►DYNAMIC ROPE ►1:1 pulleys n/a - 1.34 INPUT x 1.19 OUTPUT / 100% vs Actual 88% ►3:1 with pulleys - 1.13 INPUT x 2.26 OUTPUT / 300% vs Actual 200% ►3:1 without pulleys - 1.19 INPUT x 1.99 OUTPUT / 300% vs Actual 167% ►5:1 with pulleys - 0.89 INPUT x 3.84 OUTPUT / 500% vs Actual 431% ►5:1 without pulleys - 1.39 INPUT x 2.38 OUTPUT / 500% vs Actual 171% ►9:1 with pulleys - 0.85 INPUT x 5.92 OUTPUT / 900% vs Actual 696% ►9:1 without pulleys - 1.12 INPUT x 2.38 OUTPUT / 900% vs Actual 212% ►13:1 with pulleys - 1.01 INPUT x 5.04 OUTPUT / 1300% vs Actual 499% ►►►SEMI-STATIC ROPE ►1:1 pulleys n/a - 1.62 INPUT x 1.26 OUTPUT / 100% vs Actual 78% ►3:1 with pulleys - 1.31 INPUT x 3.46 OUTPUT / 300% vs Actual 264% ►3:1 without pulleys - 1.72 INPUT x 2.48 OUTPUT / 300% vs Actual 144% ►5:1 with pulleys - 1.10 INPUT x 5.15 OUTPUT / 500% vs Actual 468% ►5:1 without pulleys - 1.18 INPUT x 2.67 OUTPUT / 500% vs Actual 226% ►9:1 with pulleys - 1.31 INPUT x 7.48 OUTPUT / 900% vs Actual 696% ►13:1 with pulleys - 1.4 INPUT x 6.98 OUTPUT / 1300% vs Actual 498% ►►►DYNEEMA ROPE ►1:1 pulleys n/a - 2.33 INPUT x 2.07 OUTPUT / 100% vs Actual 89% ►3:1 with pulleys - 1.34 INPUT x 4.04 OUTPUT / 300% vs Actual 301% ►3:1 without pulleys - 1.47 INPUT x 2.97 OUTPUT / 300% vs Actual 202% ►5:1 with pulleys - 1.67 INPUT x 6.71 OUTPUT / 500% vs Actual 402% ►9:1 with pulleys - 1.47 INPUT x 9.62 OUTPUT / 900% vs Actual 654% ►13:1 with pulleys - 1.51 INPUT x 8.54 OUTPUT / 1300% vs Actual 565% ►►►THOUGHTS: *** % wasn't that different but my input is so much greater not fighting stretch ***9:1 is better than a 13:1 and might be worth using, but a 5:1 is the most optimal to get as close to theoretical as possible 😀😀😀DISCOUNT GAME: 👉 24% off all pulleys for 24 hours on https://www.extremegear.org/shop/hard... 👉 Discount code is found in the book of numbers in the Bolting Bible https://www.hownot2.com/boltingbible 👉 10% of your purchase (of non-sale items) supports this channel and the rest goes to Cave Exploration Society, the non-profit that owns and operates ExtremeGear. ►10% off at https://rockytalkie.com/products/rock...using the code "HowNOTtoHighline" ►Perfect Descent Auto Belays I use on my drop tower https://tinyurl.com/2p9davdj ►Balance Community has great slackline gear https://bit.ly/351FSFO ►Shirts and hats (NEW IMAGES COMING SOON) - https://www.SLACKLIFE.store ►LineScale 3 - https://www.linegrip.com/shop/linesca... ►I love my Rode Go II Audio https://amzn.to/3ftU27P Buy anything else after clicking this amazon link I'll get a commission and I may not have to paint houses anymore! 👉Amazon carabiners video https://youtu.be/sBEhKh_3xtM 👉Making a living on ad revenue is a myth https://youtu.be/m8z6adEqaOs 💲💲💲We are still 100% dependent on donations until you buy a lot from Extreme Gear :) Please donate at https://www.HowNOT2.com/donate🙏🙏🙏 Behind the Scenes abc After Posting Thoughts abc

We all know friction in a mechanical advantage block and tackle pulley systems can reduce output, but I haven't heard anyone talk about...