Weeelllllll, the 1/4 bottom isn't optional and the formula is for each bottom cutting the correct width. You know, all it is, is a way to express where the resultant soil force vector is on the plow. When you add up the individual soil force vectors of each bottom you get the resultant vector. I read a IH plowing book from 1952 and the formula was expressed a different way.
Here's my explanation: The soil force vector is located about 1/4 the width to the right of the shin, so 3/4*14=10.5" on the front bottom from the furrow wall in this case. The 2nd bottom would be at 10.5+14=24.5 and the third bottom would be at 24.5+14=38.5. Then you just average those numbers: a three bottom is easy, the center of those three vectors is at 24.5" from the furrow wall. For a two bottom it would be (10.5+24.5)/2=17.5" from the furrow wall. Or, 0.5(2*14)+0.25*14=17.5".
And, once again, this is a starting point. The actual resultant soil force vector, or point of load, will change depending on moldboard design, plowing depth, speed, and soil conditions.
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