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Terramechanics and Off-Road Vehicle Engineering, 2nd Edition by J.Y. Wong

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Chapter 6

Performance of Off-Road Vehicles

Performance of an off-road vehicle refers to its ability to overcome motion resistance, to develop drawbar pull, to negotiate grades, or to accelerate in straight-line motion. Dependent upon their intended use, different criteria are employed to evaluate the performance of various types of off-road vehicle. For tractors and the like, their prime function is to provide adequate draft to pull (or push) implements such as ploughs or bulldozer blades; the drawbar performance is, therefore, of importance. It may be characterized by the ratio of drawbar pull to tractor weight (drawbar pull coefficient), drawbar power (product of drawbar pull and vehicle forward speed), and tractive (drawbar) efficiency (the ...

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