In the arborist catalogs the loopie in use is always shown wrapped around a stem, and the working bight, attached to the hardware, is shown passing through a bight in the sleeve part of the loopie. All these bights and curves add friction to the overall system and help to keep the loopie secure against slippage. The loopie is much less secure in an open loop configuration where the loop is subjected to a straight pull, and least secure when there is no bight formed in the sleeve part of the loopie. Here I report several pull tests on 5/16 inch Tenex Tec loopies. This cord has a rated tensile strength of about 4700 lbs.
The adujsting sleeve of the loopie is much like a splice, and like a splice, the two ends of the sleeve are quite different. One end is like the throat of the splice, and the other end is like the tail. In the attached photo of a loopie in 1/2-inch Tenex Tec, these analogous parts are labelled. The dotted line shows the "eye" that isn't there, and the arrow therefore is pointing at the throat. The point marked "T" is where the tapered end of the bury would be, and is, therefore, the tail. The throat is always easy to recognize because that is where the dead little stub of the cover is to be found--the appendix.
The adujsting sleeve of the loopie is much like a splice, and like a splice, the two ends of the sleeve are quite different. One end is like the throat of the splice, and the other end is like the tail. In the attached photo of a loopie in 1/2-inch Tenex Tec, these analogous parts are labelled. The dotted line shows the "eye" that isn't there, and the arrow therefore is pointing at the throat. The point marked "T" is where the tapered end of the bury would be, and is, therefore, the tail. The throat is always easy to recognize because that is where the dead little stub of the cover is to be found--the appendix.