Experimentation is the answer. I run 4" twisted chisels on my 9 shank Unverferth. The two front ones are 30" apart. If you turn them towards the center, they can actually ball up a wad of tough residue in the right conditions. If you turn them out, they are throwing dirt right on the tires/rims. They will build a big cone of dirt right out on the wheel, then dump it right where you don't want it- like in the road or driveway. The two outboard rear ones are shown turned out. But I turn them in because I don't want to be throwing dirt off the edge of a field onto a lane, into a ditch, etc. But I still get ribbons of sod thown out here and there along grassy edges. To me the biggest issue is trash. The coulters behind the tractor tires are useless as all those tires do a better job of crushing and breaking up stalks, etc. than anything. So the machine ought to be made with all the chopping action concentrated in the middle. Good luck.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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