GTM |
GT16a |
S160 |
[ Top | S160 | GT16a | Return to Fixed Multibar ]
The SRT GTM is about as rugged as a small fixed-friction descender can be. The large mass provides a good heat sink, and the aluminum construction ensures that heat is efficiently conducted away from the rope. The device can be used on double ropes. My objection to the GTM is that it is too heavy for a fixed friction device - the small rack that I uses weighs less.
[ Top | GTM | GT16a | Return to Fixed Multibar ]
The S160 is an updated version of the GTM. It has a second eye so that the device can be reversed if it starts to show too much wear on one end. The groove over the eye is new, and the instruction sheet doesn't explain it. Supposedly it makes locking off easier for some people, but locking off a 2-hole whaletail without backup makes me cringe.
[ Top | S160 | GTM | Return to Fixed Multibar ]
The GT16a is a 3-hole (4-bar) whaletail. The extra bar allows one to get more friction at the price of a larger and heavier device. This may not be necessary for slow ropes (especially on larger stiff, sandy cave ropes), but may be important on faster ropes. If the 3-holer doesn't provide enough friction, Single Rope Technique makes 4-hole and 5-hole versions as well. Note that the eye has been made larger, which facilitates clipping in with more than one carabiner.
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©2007, Gary D. Storrick