11 Multi-Track Vehicle Handling Performance
A multi-track vehicle generally has at least one axle with more than one wheel. Imagine a vehicle riding in a straight line over a few inches of new snow. Unlike a bicycle, which would leave a single track in the snow, a multi-track vehicle will leave two or more tracks. Hence the name. Multi-track vehicles include tricycles (three wheels), quadricycles (four wheels) and other, less common wheel numbers and arrangements. In general, multi-track vehicles exhibit zero-speed stability. That is, they do not fall over when stopped. At speed, both stability and performance can vary significantly, depending on configuration, design, and environmental variables. This chapter introduces basic handling parameters and stability indices for multi-track vehicles.