1. Scope--The scope of this SAE Recommended Practice is sufficiently broad that it can encompass the full range of current heavy duty vehicles, vehicle modifications, and prototype configurations. The test procedure describes methods for examination of the vehicle's flow field using surface pressures and flow visualization.

1.1 Introduction--This SAE Recommended Practice describes a wind tunnel testing procedure for the measurement of the aerodynamic characteristics of heavy duty trucks and buses using established model testing techniques. The main emphasis is on the measurement of aerodynamic drag under flow conditions representative of the full range of vehicle operating conditions. This SAE Recommended Practice is intended as a guide toward an eventual standard, but may be subject to frequent changes in order to keep pace with experience and technological advances. Because the wind tunnel techniques are still evolving, there are areas where a generally acceptable approach cannot be recommended. These areas are discussed in the associated information report and it is suggested that this document be considered an essential reference when using the recommended practice.

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