הצגת המקור של הדף "Plastic pulley"


[[תמונה: Plasticpulley.jpg|left|200px]]
[[תמונה: Plasticpulleyonbinner.jpg|left|200px]]
'''[[גלגלת פלאסטיק]]''' 
}}LTR{{

A plastic pulley is actually a small plastic drum, made to clip on a [[carabiner]]. These [[pulleys]] do not have a bearing, and they simply roll on the biner, using is as an axle. Plastic pulleys work best onbiners that are symetric along their lonx axle, i.e. oval and [[HMS]] biners. The do not roll well on D shaped biners. Also, they will roll better on biners with circular cross section.

Plastic pulleys are dfinitely less efficient than "real" pulleys, because they have no bearing to reduce [[friction]]. They do, however, have much less friction than just a biner, and are much lighter than "real\" pulleys. It is a good idea for [[alpinism|alpinists]] and [[multipitch]] [[trad]] climbers to have one on the harness, for emergencies that require [[hauling]] and/or a mechanical advantage system.

A better option is to have a [[revolver]], a biner from DMM that has a tiny pulley at the point where the rope passes.
----
contributions to this page by: : [[user: Mica Yaniv|Mica yaniv]] and others...

 
[[category: gear]][[category: Mountaineering]][[category: gear ]][[category: rock climbing]][[category: Aid climbing]]