nylon rope

[woodchuck357]

What difference does the roofing material make? Any piece dropping heavy enough to worry about is going to tear up what ever it hits!

 

[woodchuck357]

Static line has low limits of stretch, climbing line should have shock absorbing qualities. The question was not about climbing rather about lowering. I hope you don't drop chunks with static line.

 

[miko0618]

check out the yale cordage youtube video where they test a static and dynamic rope. a 20,000lb tensile strength rope failed with 220 lbs dropped 6 feet. a 5900 lb dynamic rope held for repeated falls. so if I fall on my climbing line 6 ft, it could fail. but 1/2 nylon from lowes wouldn't be phased? if this is true, why am I paying $100 + for a climbing line that's not going to save my life if I fall? we have 1/2 and 3/8 braided and twisted nylon safety rope for fall prevention in construction. nothing polyester. I get that my tree service rope isn't a dynamic rope, but why not? rigging is catching falling objects. and why not climb on a dynamic rope? scenario, I set up in a crotch with the rope around the trunk. the crotch fails and I fall to the next branch 6 feet down. my 7500 lb climbing line, harness or back could break. with a dynamic rope, it could be a gentle pants sh*tting. just food for thought.

 

[woodchuck357]

When you climb with a static rope, keep it taunt. Don't let it get a lot of slack so a fall will involve a swing, not a drop. I climb with a dynamic rope but keep it tight, anyway. The only static ropes I use are for fun rappelling and bagged up waiting to be used in rescue operations.

 

[smokey01]

check out the yale cordage youtube video where they test a static and dynamic rope. a 20,000lb tensile strength rope failed with 220 lbs dropped 6 feet. .....

I don't know where that video is but I'm having a hard time seeing this. A 6 foot fall generates about 660 pounds of force, 3G's, (assuming a NO stretch rope) not fun but I can't see how that would break a 20,000lb rope????????????????

 

[miko0618]

Yale Cordage Ultrex vs. XTC Rope Static and Dynamic Test Demonstration - YouTube

it was 6 1/2 feet. it said it generated 1450 ft lbs.

and yes, I am not saying a fall from a slacked line. that's more user error. I just meant a fall from a limb failure or such. I use a 12 strand for climbing. they get turned into rigging line when they get worn. I've dropped some decent weight on them. I have also used a block and a winch to hoist pieces well over a ton. I feel totally confident I would break before my rope. but, what if I did fall? a dynamic rope sounds like it would be better. and for rigging, it would decrease the forces on the tree.

 

[miko0618]

watch the video til the end.

 

[tramp bushler]

I use some 1/2" and 5/8" Samson double braid that I got a spool of each when I was in Southeast . It's marine line but it works OK for pulling trees and stuff but I don't climb on it. It has some problems. It milks a lot and plucks pretty bad. . When I get it used up or even before then I will replace it with arborist rigging ropes.

 

[Pelorus]

A 6 foot fall generates about 660 pounds of force, 3G's, (assuming a NO stretch rope) not fun but I can't see how that would break a 20,000lb rope????????????????

Every foot of fall adds the weight of the piece to the total. 100 lb falling 3'= 300 lbs + the original 100 lbs = 400lbs force. Which is why a rigging block should be cinched up close to the notch/back cut of a piece getting negatively blocked down.

 

[smokey01]

Every foot of fall adds the weight of the piece to the total. 100 lb falling 3'= 300 lbs + the original 100 lbs = 400lbs force....

Yale Cordage Ultrex vs. XTC Rope Static and Dynamic Test Demonstration - YouTube
it was 6 1/2 feet. it said it generated 1450 ft lbs.

Thanks for posting the video.
Looks like I need to redo my math, I must have forgotten to carry the 1.