Climbing vs canyon rappelling

THIS IS VIDEO 5 OF 10 - See textbook 👉 www.hownot2.co...
Here is a free course featuring Brent Roth about different ways to set up rappels through a canyon. This considers ease of rigging, abrasion, ease of rescue and how efficient it is to move people through the canyon.
Episodes 1-5 show the systems,
Episode 6 shows how it can all be done with 1 device,
Episodes 7-8 are friction tests,
Episodes 9-10 are break tests of the hardware and the knot blocks.
All the episodes are in the textbook
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Double Static Rope System
02:27 - Adding friction
06:00 - Careful, it's hard to rescue
09:29 - Double Releasable
13:30 - DoubleD Static
20:23 - DoubleD Releaseable