I have to agree with Stuey about the figure 8 descender; it will kink ropes like crazy, and the longer the rope the worse it gets.
Any descender that operates in a linear fashion is preferable to one that twists the rope around tight bends.
I use a Rack as my preferred device followed by the Stop if I'm working in a shaft cutting hitches or whatever.
I sometimes use a figure 8 for belaying when lowering kit down a pitch (light loads) and use dynamic rope NOt static.
I've had a crack on just about everything including using an Italian hitch on a steel Krab...OK for a small inclined pitch where death is not a possibility.
The 5 bar Rack is said to have been invented in 1966 by John Cole, and has been hailed by seasoned in oak experts as 'the best all-round descending device ever invented'. :thumbsup:
Its beauty is inits simplicity and tha fact that you can vary the friction on the device to suit your descent...as you go!
Your right hand acts as the brake hand down by your hip, and your left controls the position of the bars to increase or decrease your rate of descent.
Great performance on wet and inherently slippy ropes, use all 5 bars and push them up tight. A Stop type device is tickier having to employ the use of a brake Krab to get the extra friction.
Variable friction is the safe way to go.. :thumbsup:
"You Chinese think of everything!"
"But I''m not Chinese!"
"Then you must have forgotten something!"