I know differnt pieces of iron are called differnt things in differnt areas but around here what I have always heard called a subsoiler is a long straight shank with a big shoe on the bottom and it brings every thing 2' down up to the top. Some contraptions I have heard called a ripper don't have as big of shanks and alot smaller shoe on'm. Any ground I have ever seen that was subsoiled had huge ridges in it and had to be worked down in the spring. Depending on how they are set up some rippers will do this and some will not. Most of the ones used around here in min-till or even strip till situations are the disk rippers, they leave most of the residue inplace. People then can come back in the spring and not till over where it has been. I am thinking that a rule of thumb is around 50 hp/shank.
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Today's Featured Article - Tractor Profile: Allis-Chalmers WD45 (Gas Version) - by Staff. Beginning production in 1953, the WD45 had the same general look as the WD tractor which was produced earlier - but was much more powerful. This was due to the new 4-cylinder "Power Crater" gasoline engine with a 4 x 4-1/2 inch bore and stroke. Some people feel this was one of the most significant tractors offered by Allis-Chalmers in those days. Nothing in its weight or power class could match its performance. In 1954 they began offering the WD45 with the new "Snap-Coupler&quo
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