Originally Posted by Ren Ching
The two scenarios you describe are identical in terms of loading and line speed. Only ff the snatch block is used to recover another vehicle (i.e. the mounting point moves) then you halve the load and line speed. In that case each portion of the line bears half the load and the pulley bears the full amount of the load.
If the mounting point for the pulley is stationary ie. a tree, all you are doing is changing the direction of the pull and getting a bit more cable off the drum. In that case it may appear that you have eased the load on the winch as it is less likely to stall with more cable off the drum. In this case each length of line on such a pull bears the full load of the pull, and the snatch block and its mounting point bears double the load...............
This is an older thread that I just ran across, but in reading this response, I believe your thinking on this is wrong. What you're saying is that, if your truck is stationary
(the "pulling point"), and if you run your winch cable out to a pulley attached to a moveable
object (the "pulled point"), then back to your truck, you gain a mechanical advantage due to the ability to move that object being pulled. Well, if my understanding of mechanical advantages is clear, just reverse your thinking and the mechanical advantage is still there. The only difference is that you're trying to move the Pulling Point not the Pulled Point........this has been my understanding of snatch block operation since I've been 4 wheeling, and my experience bears out this understanding. Try winching (under heavy load) to a fixed point. Then, insert a snatch block at the fixed point, and see how much less your winch must work, albeit half as fast. Otherwise, for recovery
purposes, snatch blocks would never be sold singularly, but only in pairs. If they were sold alone, using your logic, they could only be beneficial for angular winching.............anyone out there disagree with me on this?