Abstract
In this work a lumped parameters model, set up for the analysis of kart dynamics, is presented. The model takes into account the main geometric and stiffness characteristics of the vehicle. Particular attention was dedicated to the effects of front axle geometry, steering kinematics, frame torsional stiffness, tires radial stiffness and to the absence of any suspension and differential system. The parameters necessary to define the model were experimentally determined. On the basis of a set of data, recorded by an on board ad hoc developed system, the basic dynamic quantities could be evaluated, such as the centre of gravity velocity, the axles lateral loads and cornering angles and the vertical load acting on each tire. On the basis of these data the kart directional behaviour could be analysed using a modified single track model. The effect of the main design parameter, i.e. frame torsional stiffness and caster angle, on the kart directional behaviour could also be studied.