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In an attempt to establish correlation between off-road performance of full-size vehicles and scale models in clay type soils by use of a similitude analysis, the U. S. Army Transportation Research Command (TRECOM) conducted a series of vehicle performance tests in three types of cohesive soils for a complete range of moisture content levels. This investigation covered a study of all soil parameters that could affect vehicle performance in low, medium, and high cohesion disaggregated soils, including the effects of vehicle weight, tire design, speed, slip, and soil characteristics on drawbar pull and tire sinkage. The results obtained and experience in testing techniques accumulated from this project are described.

This paper is concerned with an adjustable scale model capable of tracing maneuverability patterns of trailer trains. The transient kinematic paths of a multiple unit carrier of train configuration consisting of ten cargo units provided with conventional two wheel steering, conventional four wheel steering, and modified four wheel steering with a steering ratio and delayed steering action are investigated and discussed.

This paper presents the results of an investigation of the normal sources of hydrocarbon emissions of passenger cars. The sources were considered to consist of the crankcase ventilation and exhaust systems, the carburetor, and the fuel tank vent. Many studies involving the emissions from several of these sources have been conducted and reported; however, it is believed that this is the first study designed to develop emission data from all the sources of a single group of passenger cars. Although only five vehicles were used, several mechanical conditions and engine and power train configurations were examined. The largest single source of hydrocarbon emissions was found to be the exhaust, followed by the road draft tube. Relatively minor emissions were measured as a result of fuel evaporation from the carburetor and fuel tank during periods of operation and hot soak.