Posted by Turkeyfoot on August 01, 2021 at 08:16:57 from (174.234.0.209):
In Reply to: Mileage question posted by rrlund on August 01, 2021 at 07:16:45:
With respect to internal combustion or any type of heat engine, the maximum work (highest efficiency) is achieved when all strokes occur under reversible conditions under which each step of the stroke takes place with external pressure and internal pressure equal during each step of the process. This is a requirement that also minimizes the power output (energy per unit time) but does allow one to calculate the maximum efficiency for an engine of any design. So as rpm decreases the engine efficiency (work out divided by energy consumed) will approach the theoretical reversible limit at the sacrifice of power. This discussion is not much use in the hayfield, haha. But I'd project that going at lowest rpm that allows for enough power to sufficiently work your rake should be most efficient but make for a long day.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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