The Single Rope Technique (SRT) is a method for descending and ascending using just a single rope. It is used not only in tree climbing but also for caving, climbing, canyoning, potholing, rock climbing and building maintenance.
SRT is widely used for getting to the top of large trees. It is a fast, energy-efficient method for ascents of 50 feet and higher. SRT is also especially effective for climbing trees with limbs that are hard to isolate.
You will need hardware to be able to use this technique, such as attached weight, a throw line, a launching system (bow or slingshot) and a climbing rope.
SRT has some drawbacks; it does not necessarily involve you ascending the tree directly. Instead, you will be climbing the ascending rope most of the time. If the ascender touches the tree, it may cause a twig or bark to potentially jam the cramming mechanism.
There are many descending techniques that you can use for SRT. This includes Petzl stop and bobbin, and rappel racks. However it is important that you have a climber backup that will automatically catch when the climber lets go.