I remember, years ago, driving back from a gag shop, where I bought some Chinese finger cuffs. Quite amazed with the principle on how they work, I proceeded to play with them while I was driving, not thinking it might not be a good idea. Sure enough, I was approaching a curve in the road and now my fingers are trapped in the cuffs. Of course, the harder I pulled to release my fingers the more the cuffs would constrict to keep my fingers entrapped. Fortunately, the cuffs were made of cheap material and I was able to pull hard enough to tear the cuffs apart. Fortunately, they were nothing more than a toy.
When is a toy not a toy?
Arborists have been using the principle of the Chinese finger cuffs for years in a tool called a whoopie sling.
A whoopie sling is an easily adjustable rope sling designed for tree pruning or tree removal. The whoopie sling works by wrapping the sling around the trunk of a tree or a heavy load bearing limb and pulling the end of the rope within the sling through a spliced choker. By adjusting the size of the eye in the rope through the choker the user is able to adjust the length of the sling constricting around the tree without needing knots. It is also becoming more common (usually in smaller diameter) for suspending hammocks during hiking or camping.
The Whoopie Sling is made by running one of the free ends back through the hollow core of the cord itself—That’s the short explanation. Before we show how to make one, lets examine the preferred cord for hammock campers.
I’ve all but given up on 550 cord. For my uses, I’ve never really liked how it stretches. Instead, I’ve switched to Amsteel Blue for it’s vastly superior strength and it’s NON-stretch qualities and have also switched to tarred line, also known as bank line and decoy line for other jobs where Amsteel is an overkill.
breaking strength of Amsteel Blue
7/64…… has a breaking strength of 1600lbs
1/8……… has a breaking strength of 2500lbs
3/16……. has a breaking strength of 5400lbs
So, you can see, for such a small diameter cord, you have a far superior strength line compared to 550. Of course, that comes at a cost, literally… Amsteel Blue is much more expensive $.28 a foot for the 7/64 — $.45 a foot for 1/8 — $1.08 a foot for 3/16. But, for those of you who like to drop hundreds of dollars on a knife, that should be no big deal.
But search around you may be able to find it cheaper
For tarred line, bankline, decoyline, etc. do yourselves a favor and go straight to memphis net and buy it by the roll for cheap
http://www.memphisnet.net/category/twine_tarredseine …. 1296 feet of 126lb breaking strength line is under ten dollars. there are other strengths, as well, for inexpensive.
So how do you make a whoopie sling? Lucky there is no shortage of instructionals that show how
So there you have it. If you’re trying to lighten up your load, by reducing the need for rigging or want some knot free ways of using your cordage, try the whoopie sling.
CREDIT: Lead photo…. arbtalk.co.uk