Anyone ever break a NEW 3/4" whoopie?

[daveyclimber]

Just wondering if anyone has snapped a 3/4" whoopie sling . Brand new out of the bag . Used it to hang a new block and pop out a Digger top . SNAP , right on the fence. These are rated at 3400lbs choker and the top was about 2k with very minimal dynamic load .

 

[Kevin]

You should send that in to be examined.

 

[kf_tree]

did you scream i'm calling my lawyer? at what point did it break at?(where on the sling)

 

[daveyclimber]

It Snapped right in the middle , where one line passes through the other . It was the inside line , not the outer "sheath" . does not seem right to me . I would think it should have broke at the eyes or the outer sheath , not a full undisterbed tenex line

 

[Kevin]

Maybe they have a bad lot, should be checked before someone gets killed.

 

[kf_tree]

i have a 3/4 tenex with a spliced eye for my hobbs block. i use the woopy slings for the lowering device. the other pulley has a spliced eye on a 3/4 stable brade. i never really thought about useing a woopy sling on a block. if you send the sling back, please post the results.

 

[Kevin]

I just bought one to be used with the PortaWrap.

 

[TheTreeSpyder]

Anything is super strong or weak in it's own range!

i think 1T can easily get some stretch/run on all but the most pretightened/ and or multi legged roping systems.

With 8" of drop and or stretch, you would have exceeded the stated SWL. i've broken a 3/4" Stable braid once some time ago.

 

[Treeman14]

Check out page 187 of Arborist Equipment. According to Blair, a 2K lb. static load will put 4K on the sling. Any dynamic loading will increase that even more.

 

[Kneejerk Bombas]

Yep, you over loaded it.
Remember each leg of the lowering line was pulling 2k, which means 4k on the sling. Add dynamic loads and you were way past it's capacity.
I don't use whoopie slings for that reason, for the size rope, you don't get much capacity.

 

[Kevin]

It could more than double the weight under shock loading at the friction device so 2k is probably in the ball park of snapping the W-sling depending on the run and the shock load.

 

[treeclimber165]

OOOOOOOPS!!

Looks like someone forgot to do the math before making that cut!

 

[Kevin]

If you could have done the drop without the shock load it should have taken it.

 

[Kneejerk Bombas]

Kevin, I think you are wrong.
2k+2k=4k
The 4k load is more than 3.4k sling capacity.

 

[TheTreeSpyder]

Wow i missed that!

Yes, 2x load at vertical line hang!!!!!!!!!!

 

[Kevin]

Mike, I don`t doubt you but ...

Am I missing something here?

 

[o0_TreeMan_0o]

If there is a 100 lb load on one side of that pully and 100lbs force holding it on the other then the pulley is supporting 200 lbs. So the sling was subjected to a 4k load.

 

[treeclimber165]

Kevin,
In your drawing, how much weight (or equivalent resistance) is holding the tail of the rope? If you are suspending a 100lb. chunk, you need the equivalent of 100lbs resistance on the other end or else the chunk will fall. So if you have 100lbs on each end of the rope, you have a total of 200lbs on the rope to hold 100lbs.

I hope that was clear as mud!

 

[Kevin]

Ok,Thanks.
That`s why I come here.

Should that anchor then read 200 lbs. instead of 100 lbs. ?

 

[kf_tree]

this thread is getting me a little scared. i don't use whoopy slings except for a lowering device(3/4). i said before i use a 3/4 tenex eye sling on my hobbs block and a 5/8 stable braid eye sling on my other pulley. now useing a 5/8 stable braid or similar 5/8 bull rope what is the biggest piece i should take on a set up like that? some one mentioned a 6in drop, but by with all the streach in the system i see more of a 6ft drop when lowering wood (butt tie fashion except useing a block) i recently took out a big oak lead (storn damage) the limb was about 50 ft long and at the tear the wood was about 26in in dia. i rigged it up with 2 5/8 lines and cut it free from the trunk. the limb had to be at least 3000lbs. the 5/8 butt rope looked like a 1/2 in line when the weight was on it. there was not much of a drop since i had the ropes pretty tight before i cut it free. both ropes where tied off on porta wraps. was i over loading the 5/8 lines?