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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Today's Featured Article - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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