Hank Moody wrote: ↑
16 Feb 2018 11:30
Given my recent back surgeries I'm seriously considering this to help me lift the F800 when I dump it and Troy is not there to lift it for me. It is a little pricey, so Saifri or someone else might be able to direct me to another option.
Appears to be what whitewater boaters call a "z drag", used for boat recovery if wedged / current. Really a block and tackle. Similar to a "trucker's hitch" which I use when securing loads to roof or trailer with rope.
Take a look at these:
https://www.rapidmedia.com/rapid/catego ... ond-z-drag
https://i.pinimg.com/originals/8e/fb/32 ... 7a7145.jpg
https://borealriver.com/en/learn/whitew ... er-rescue/
More images: (choose images)
A much lighter system could be had with tubular webbing (just looked up some 5/8" rated at 9kN = 2025 lbs), which packs down much better than rope. Ditch the pulleys, as tubular webbing will slide through a carabiner without much friction (and the motion will be slow so little heat buildup). Don't attempt to slide webbing on webbing.
So you need webbing for the following:
1. loop around your anchor (tree?)
2. loop around your forks. (Or attach a grab strap and leave in place as I have on my KTM. Sew fork tube loops in both ends of a hunk of webbing. Lower forks, thread through loops. I reused some orange webbing that HomeDepot used to secure a lumber load.)
3. go between anchor and moto with a double back; figure double the max separation distance.
Add three carabiners (one for each end and one at midpoint) and a prusik (to allow you to lock progress). The midpoint carabiner can be attached by putting a slip knot in the webbing.
If the webbing changes direction at the anchor, you haven't gained any mechanical advantage.
If the webbing changes direction at the load, you have doubled your force.