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WIND RESISTANCE OF MOTOR VEHICLES

THE INVESTIGATION OF WIND RESISTANCE OF MOTOR VEHICLES WAS UNDERTAKEN. THE METHOD USED IN TESTS CONSISTS OF MEASURING THE AVERAGE PULL OF THE WIND OF A CAR SUPPORTED ON A PLATFORM WHICH FLOATED IN A LARGE TANK. AN AUTOMATIC DEVICE RECORDED THE VARIATIONS IN PULL, WHICH WERE AVERAGED BY MEANS OF PLANIMETER. WIND VELOCITY WAS DETERMINED BY MEANS OF ANEMOMETERS AND ITS DIRECTION DETERMINED BY WEATHER VANES. AFTER A YEAR'S WORK, THE METHOD WAS ABANDONED BECAUSE OF THE EXTREME VARIABILITY AND GUSTINESS OF THE NATURAL WINDS, AND A WIND TUNNEL LARGE ENOUGH TO BE USED IN TESTING FULL-SIZE CARS WAS DESIGNED AND BUILT. THE SET-UP IS DESCRIBED OF THE WIND TUNNEL, MOTORS AND FANS TO PRODUCE WIND VELOCITY OF 36 MPH. A SPRING BALANCE IS USED FOR MEASURING THE PULL ON THE CAR AND THE WIND VELOCITY IS MEASURED BY MEANS OF A PITOT TUBE AND AN INCLINED MANOMETER. A DEVICE FOR LIFTING THE CAR OFF THE PLATFORM IN ORDER TO OBTAIN THE EFFECT OF THE WIND ON THE PLATFORM ITSELF WAS PERFECTED.

  • Record URL:
  • Supplemental Notes:
    • Vol 4, pp 20-22. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
  • Authors:
    • Conrad, L E
  • Publication Date: 1925

Media Info

  • Media Type: Digital/other
  • Monograph Title: Proceedings of the Fourth Annual Meeting of the Highway Research Board Held at Washington, D.C., December 4-5, 1924
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00223274
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Nov 9 1970 12:00AM