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D Mc · 14th December 2007, 03:27 PM

George, The tensile strength appears to be stronger than I thought (around 23 kN) which is fine. But still, all things being equal, I will choose a stronger tie in point and the Rock Exoc pulley is rated for a little over 8000#, is $40 cheaper with swiveling cheek pieces.

Tree Machine, I use the 2:1 and the 1:1 for ascents but I always use the 2:1 for working the tree. The actual ascent into the tree rarely takes more than 5 minutes but the actual doing of the job can take hours. That is where the reduction of friction of the 2:1 system will become noticeable. The friction reduction in a good quality pulley compared to the friction saver is noticeable. I'll take what I can get.

More motion in the 2:1, yes. But also mechanical advantage lifting half my body weight makes my old arms feel young again.

D Mc

14th December 2007, 03:27 PM	#8 (permalink)
D Mc Semi-mature vigorous tree Join Date: Nov 2007 Location: Montana Posts: 72	Re: ART Cocoon Pulley George, The tensile strength appears to be stronger than I thought (around 23 kN) which is fine. But still, all things being equal, I will choose a stronger tie in point and the Rock Exoc pulley is rated for a little over 8000#, is $40 cheaper with swiveling cheek pieces. Tree Machine, I use the 2:1 and the 1:1 for ascents but I always use the 2:1 for working the tree. The actual ascent into the tree rarely takes more than 5 minutes but the actual doing of the job can take hours. That is where the reduction of friction of the 2:1 system will become noticeable. The friction reduction in a good quality pulley compared to the friction saver is noticeable. I'll take what I can get. More motion in the 2:1, yes. But also mechanical advantage lifting half my body weight makes my old arms feel young again. D Mc