Full scale aerodynamic drag tests were carried out on a lorry to measure the drag reducing effects of a range of proprietary "add on" devices. The test vehicle was a Ford D1614 with the flat bed replaced by a container which was moveable to represent either a rigid truck, where the container was closed up to the driver's cab, or an articulated truck with a representative gap between the cab and the trailer. The most successful family of devices consisted of wide bladed cab-roof-mounted shields, in which generally the angle of the blade can be adjusted to suit the particular vehicle application. Though all the other devices tested were less effective, all those examined reduced the drag, and hence the fuel consumption, of the basic test vehicle. Operating conditions may dictate the choice of devices and in this respect the report will aid the final selection, not necessarily by indicating a particular product, but by showing the potentialities of various families of devices. The test results show good correlation between the wind tunnel measured drag coefficients and the steady-speed fuel consumptions, demonstrating that, despite the high blockage effect, the wind tunnel is a suitable facility for medium-sized commercial vehicles and in particular for developing drag reducing devices for all commercial vehicles. (TRRL)

  • Corporate Authors:

    Motor Industry Research Association

    Watling Street
    Nuneaton CV10 0TU, Warwickshire,   England 
  • Publication Date: 1978-12

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 37 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00310193
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: K 23049 Monograph
  • Files: ITRD, TRIS
  • Created Date: Oct 8 1980 12:00AM