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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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