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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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