Any recommendation on favorite pulleys for crevasse rescue and reasons why? For instance, "x brand is better since you get x ounces in weight reduction with only x reduction in weight capacity".
Thanks for any insight!
by WyomingSummits » Sun Jan 27, 2013 11:27 pm
by Andes6000 » Mon Jan 28, 2013 1:10 am
by WyomingSummits » Mon Jan 28, 2013 1:26 am
Andes6000 wrote:Check out the petzl ultra legere pulley, i haven't used one so perhaps someone who has can share some insight on that, and always have a tibloc clipped on your harness for self rescue.
by nartreb » Tue Jan 29, 2013 4:24 am
by Wastral » Tue Jan 29, 2013 6:55 am
nartreb wrote:I've never done a crevasse rescue in the field, but with pulleys in general, a larger-diameter pulley is WAY more effective than a small one.
by pvnisher » Tue Jan 29, 2013 8:57 am
by Andes6000 » Tue Jan 29, 2013 3:14 pm
pvnisher wrote:The DMM Revolver. Locking biner with a pulley built right into it.
Get a wiregate revolver for those long extensions to reduce rope drag, and a locking one for crevasse use.
http://dmmclimbing.com/products/locking-revolver/
by nartreb » Tue Jan 29, 2013 4:40 pm
Two factors determine a pulley’s efficiency:
- sheave size (the wheel that the rope runs on): the larger the diameter, the greater the efficiency
- bushings and bearings: self-lubricating bushings are efficient. Sealed ball bearings are very efficient and require very little maintenance.
In general, larger sheave diameters produce greater pulley efficiencies.
by Wastral » Tue Jan 29, 2013 11:51 pm
by nartreb » Wed Jan 30, 2013 4:02 am
by WyomingSummits » Wed Jan 30, 2013 4:35 am
by Wastral » Wed Jan 30, 2013 8:35 am
nartreb wrote:So it's "100% wrong" that "a large diameter pulley is way more effictive than a small one", but "the DMM revolver pulley is way too small", have I got that right?
Wake me up when you grow up.
by Wastral » Wed Jan 30, 2013 8:49 am
The Chief wrote:WHY are you using pulleys???
A "Z" or 3:1 can be effectively accomplished with...
by asmrz » Wed Jan 30, 2013 4:12 pm
by Fletch » Wed Jan 30, 2013 4:52 pm
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