 #1
I am interested in building a lever system for pulling up small tree stumps. I have seen this demonstrated on youtube videos. For example...
However, I am more interested in calculating the various forces and mechanical advantage for such a system so I can figure out the best lever length, chain strength, and pulling angle. I have yet to find an example calculation for such a system and I'm not even certain which class the lever is. I would assume either class 1 or class 2. Anyway, here is a crude drawing of the system. Any help with identifying class and formula for calculating MA would be greatly appreciated. I would like to know what happens as the lever moves toward the force of pull as it first straightens up then collapsed toward the ground again which also alters the angles during the progress of the pull.
However, I am more interested in calculating the various forces and mechanical advantage for such a system so I can figure out the best lever length, chain strength, and pulling angle. I have yet to find an example calculation for such a system and I'm not even certain which class the lever is. I would assume either class 1 or class 2. Anyway, here is a crude drawing of the system. Any help with identifying class and formula for calculating MA would be greatly appreciated. I would like to know what happens as the lever moves toward the force of pull as it first straightens up then collapsed toward the ground again which also alters the angles during the progress of the pull.
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