Research into improving the aerodynamics of articulated vehicles being carried out by General Motors is discussed. Early tests with an open-sided dragfoiler deflector mounted on a tractor roof to deflect air over the trailer gave a 20 per cent drag reduction and a 13 per cent reduction in fuel consumption. Wind tunnel tests indicated that modifications were needed to improve airflow so that the dragfoiler was given a narrower nose and concave-convex side panels resulting in drag reductions of 36 per cent. Further modifications were made in order to optimise the shape for variation in trailer gap and exposed height. Wind tunnel tests showed that the drag reduction was still satisfactory at large yaw angles of 15 deg. Practical evaluation of the dragfoiler design was provided in commercial service where it was found to give an overall reduction in fuel consumption averaging 9 per cent. /TRRL/

  • Availability:
  • Corporate Authors:

    Institution of Mechanical Engineers

    1 Birdcage Walk
    London SW1H 9JJ,   England 
  • Authors:
    • Baker, A
  • Publication Date: 1976-10-11


  • English

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 39-41
  • Serial:
    • Volume: 1
    • Issue Number: 7
    • Publisher: Institution of Mechanical Engineers
    • ISSN: 0307-6490

Subject/Index Terms

Filing Info

  • Accession Number: 00149020
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Jun 17 1977 12:00AM