Merle Nelson
TreeHouser
- Thread Starter Thread Starter
- #676
Not familiar with anything tree related in stick form Peter, unless that is a marking crayon. What is it?
Sorry, but your setting with the portawrap doesn't give you one bit of a mechanical advantage. Even worse, you loose some of your traction power by the friction in the blocks and in the rope. The two blocks are both tied to a fixed point. Therefor, they can't have a movement relatively to each other and to the whole setup, which precisely is what should be done to obtain a MA. Here, the same force flows through the system up to the crown, minus the friction's loss. All you get is a useless double redirect.
Remember the Masdam slips around 1500lb of pull.
Even less when wet.