There was a formula that I learned in an ag engineering class at Cornell for calculating HP requirement to moldboard plow.. I can't remember it at the moment but should be able to find it someplace. Engine HP was not considered as rated PTO HP but was considered relative enough to it even though you obviously don't use the PTO to plow but measure via a dynamometer from that point. Anyhow, on the heavier soils here it takes 20 HP per 16" bottom. 24HP per 18" bottom going to maximum recommended depth. Engine HP is a more critical measure today as electrical, hydraulic, misc systems consume more HP versus a tractor made during the 1970's that may lack partial or full power shifting and air-conditioning plus system monitors.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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