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, or in sailing.
- Tree Care Industry, Volume 11, National Arborist Association, 2000 - Arboriculture
- Evaluation of current rigging and dismantling practices used in arboriculture, page 79
- Derek J. Hansen: The Ultimate Hang (An Illustrated Guide To Hammock Camping), 2011, ISBN 1-4662-6368-7
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