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Good job, Thank you for your information.

Excellent job.

Thank you

Great info and demonstration, thanks.

Thank your for this simple explanation of rope angles :)

Straight talk advice. Finally good communication.

Great video, great teacher

good one

Excellent video! A great tool that explains.

Concise, helpful.

Explained perfectly, thanks!

Excellent video! I've been sharing it regularly with people struggling to understand the concepts. Kudos.

Great work.

Thank you for another excellent presentation. I propose calling the "I", "IFFY" instead of IDEAL in the I, Y, T method !

I can see the advantages of the different systems but assuming the load to lift is 100 KG what is the load on the anchor point for each of the systems?

Excellent tuition. Simple,direct,all the relevant information and just the relevant information - the mark of those who have mastered their subject. Tutor delivery of the same standard too. You've set the bar very high for those who wish to follow. Well done and thank you.

Thanks, I wasn't aware of the Prusik minding sheave arrangement. Excellent information. Cheers.

180 power

protractor.

great job mate

Good Teaching.

Hello, Very hard to handerstand and to reproduc, but it's working (one goes x2 speed than an others). Thanks i'll watch the other time to assimilate! Sorry for the orthograph.

Hello Good système for à personne or a little charge, but the descendeur is not for the eavy load! The second système is good for the eavy load. Thank you for the vidéo!

Excellent. Thank you.

Excellent.

Excellent.

Excellent.

At 4:50 you mention an MPD. For those (like me) who didn't know what that was, it's a multi purpose device as shown here. www.cmcrescue.com/equipment/rope-rescue-team-kit-mpd-rigging/

great vid thanks

Great instructional video, however I'm still not too sure about why using anchors less than 30 degrees is dangerous. I see what you're saying that when the load is not balanced you will have uneven stresses on the anchors, but that is the same for anchors between 30 and 90 degrees, as you have demonstrated at 90 degrees. Why do the 'below 30 angles' get relegated to the red dashed line club?

Thanks for this video, it has really helped me understand further the pulley system!

do U have a website we can visit ? are u located in NSW ??

angles matter

The 2 degree increase from 150 to 152 degrees in angle doesn't give a 25% increase in loading (7m40s), but a 25kg increase. That's about 12% of 190kg.

Just rent a crane.

wow! excellent video, explains things very nicely!

Great very interesting video

thank you

Very clear and interesting demonstation. I'd love to see a video showing the loads generated by the american death triangle.

Thank you Rob... An essential tutorial for all climbing sports too..

Hello, I have a question and suggestion to part 3: As You mention in previous part, MA of the system is equal to number of strings attached to the load. There is a competing opinion that MA of the system is equal to number of pulleys attached to the load multiplyed 2, so it can only be even number: 2:1,4:1, etc.., so odd MA systems are not exists and last odd string attached to load directly is have only load re-directional role. Can You please make experiment of simple pulley system with 5:1 and compare it with equal 5:1, but attach last 5th string not to the load, but, let's say, to the ground, or some another static point and compare effort required to hold load hanging under the ground. I have made attempt to do such experiment, but i haven't digital measurement equipment and because of friction and small weights i've used I was unable to achieve solid result proving one or another opinion.

excellent video! I picked up a few gems of information for my rock climbing anchors setup. (strive for minimum 30 degrees now!)

learnt more new things about Y hangs, and had my pre-existing perceptions challenged more, than I have for years. Thank you.

Great video, thanks for sharing. We posted on our Search & Rescue team page. (facebook.com/WildernessRescueTeam?ref=bookmarks)

This is great!!

Hi Mark, That’s a good question. When we haul in the direction of travel, the rope is generally doing a 180 degree turn around the pulley. The angle between the ropes (often referred to as the internal angle) will be zero degrees. In this situation we get maximum mechanical advantage. When we haul off line, or not in the direction of travel, the internal angle increases and we get a corresponding reduction in mechanical advantage. We are talking ideal mechanical advantage (IMA) here so we are disregarding friction through pulleys, additional mass of equipment and a few other effects. If we consider a simple 2:1 pulley system: 0 degrees Internal angle gives 2 : 1 Ideal Mechanical Advantage (IMA) 30 degrees gives 1.9 : 1 IMA 60 degrees gives 1.7 : 1 IMA 90 degrees gives 1.4 : 1 IMA 120 degrees gives 1 : 1 IMA So from this, the internal angle can run out to 30 degrees without too much loss but when the internal angle reaches 120 degrees, there is no mechanical advantage. Thanks for the question. I hope this information answers it.

Rob: at 2:44 to approximately 3:10 you talk about pulling in the direction the load is travelling and losing mechanical advantage as the angle increases. Is there any information you know of that tells us how much MA we are losing at differing angles? I'm just trying to figure when it would be appropriate or necessary to use a change of direction pulley. Thanks in advance.

by far the best video i've seen to explain vector forces. Thank you.

Fantastic demonstration thanks mate!

Part 3?