Monday, 24 March 2014

Pulling over a stem/mini MA system in action

Couple of pictures of my Mini MA system in action this week pulling over a large diameter stem from a big poplar fell

3:1 below on the ISC and the mini MA on top on the pinto

Not abundantly clear from the pictures but basically I set up a standard 3:1 MA on the rigging line using a large lowering block anchored to the cherry tree, this then went back to a Pinto rig attached to the rigging line via a 14mm sirius split tail blake hitched to the line. I then attached My mini MA to the pulling end of this line. This basically meant I had a 3:1 advantage pulling on a 3:1 system, now I'm not sure what this means mathematically speaking (maybe 7:1?) but all I do know is the two guys pulling the stem over had no trouble at all.

I'm sure this is nothing new to a lot of you and setting up mechanical advantage to pull a stem over is fairly standard practice. However I know in the past setting up anything more than a 3:1 just with a rigging line and pulleys uses up a lot of rope very quickly, even with a 60m rope you quite quickly run out of rope unless your anchor is very close to the tree your pulling over.

So by being able to use the Mini MA system on the end of the rigging line this issue was negated as well as considerably cuting down on the setup time. 

I have a video of the stem coming down I will upload at some point. 

No comments:

Post a Comment