The Purdue Engineer Volume 16-17

The Purdue Engineer Volume 16-17

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: the case of the former an additional loss of approximately 50 per cent. of the power in transmission and rolling. The physical conditions under which the tractor operates greatly affect the power output for the quantity of fuel used. It is evident that a tractor plowing tough, sticky clay, soft meadow land, or loose sandy soil will give different results at the drawbar, not only because of the difference in the tractive effort, but in a large measure because of the varied rolling loss. This loss cannot be entirely eliminated, but if it can be accurately meas-_ ured a way will be opened for such changes in design as will materially decrease it. ' At present, according to the information at hand, there is no equipment available for measuring the roll ing loss directly in the field. As a graduating thesis, under the direction of Prof. G. C. King, of the School of Mechanical Engineering, the writer is designing "A Tractor Attachment for Field Testing," or, rather, a set of dynamometers by means of which an exact measurement of the power delivered to the tractor at the periphery of the drivers and the power output at the drawbar can be made. From the relation of these two, the distance traveled and the revolutions per minute of the drivers, the rolling and the slippage losses will be determined. _ iThe attachment will consist of four parts: a dynamometer for measuring the power input at the periphery of the drivers; another for measuring drawbar pull; an apparatus for measuring the distance traveled and the revolutions of the drivers, and a recording device. The power input at the drivers will be determined from the amount of lift of the front end of the tractor, resulting from the pull on the drawbar, which acts as a more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • United States
  • English
  • black & white illustrations
  • 1236966392
  • 9781236966391