The work of Fu (1965) was extended to determine whether a linear analysis which includes the overturning and aligning moments of the pneumatic tire will yield improved accuracy in the prediction of the equilibrium turning behavior of a single-track vehicle. Comparisons between theory and experiment showed that it is necessary to account for small changes in tire properties caused by the shift in tire normal loads resulting from aerodynamic drag, lift, and pitching moment, in order to make a reasonably accurate estimate of the understeer gradient prevailing at different speeds. An examination of the reasons for the inability to make better predictions of the steering torque required to hold a cycle in a steady turn showed that this prediction requires very precise data defining the geometry and inertial properties of the front fork and wheel assembly as well as highly accurate data defining the mechanical properties of the pneumatic tire. Measurement of intake manifold pressure showed, as suspected, that single-track vehicles, in contrast to double-track vehicles, do not require a significant increase in propulsive power in order to maintain speed on a turn of decreasing radius.

  • Supplemental Notes:
    • Conference held in Washington, D.C., 18-23 May 1980. Also published in HS-029 680, International Motorcycle Safety Conference Proceedings. Volume 2, p 659-90.
  • Corporate Authors:

    Motorcycle Safety Foundation

    780 Elkridge Landing Road
    Linthicum, MD  United States  21090
  • Authors:
    • Watanabe, Y
    • Segel, L
  • Publication Date: 1980

Media Info

  • Features: References;
  • Pagination: 32 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00389656
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: HS-029 690
  • Files: HSL, USDOT
  • Created Date: Oct 30 1984 12:00AM