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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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