The note gives the braking force coefficients of five radial ply and five crossed ply tyres on four wet road surfaces at speeds of between 30 mile/h and 130 mile/h. The coefficients were evaluated by braking the front wheels of a car until these locked and measuring the resulting deceleration. Both 'peak' and 'locked wheel' braking force coefficients could be determined from the records. Results are shown graphically. On the surfaces tested, the coefficients tended to fall with increasing speed, except for a harsh well drained surface on which the peak coefficients tended to rise. Comparisons between the two types of construction show that the low speed coefficients were very similar, but that in general the radial ply tyres had coefficients which fell off to a lesser extent as speed was increased so that they had larger coefficients than the crossed ply tyres at the higher speeds. Locked wheel coefficients fell at a faster rate with increasing speed than did peak coefficients, so that there were considerable differences between these coefficients at the high speeds. This difference was more marked for the radial ply tyres. Under certain conditions of speed and surface a motorist may have coefficients of up to 0.5 to 0.6 if the braking has not passed the peak, but only 0.1 when the wheels lock. He may therefore derive a mistaken impression of the capacity for braking which would be available to him if he were caught in an emergency. (Author)


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    Titel :

    Braking Force Coefficients Obtained with a Sample of Currently Available Radial Ply and Crossed Ply Car Tyres


    Beteiligte:
    J. K. Meades (Autor:in)

    Erscheinungsdatum :

    1967


    Format / Umfang :

    21 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch






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