The report is a summary of the planar motion free-flight testing techniques and procedures employed at the Naval Ordnance Laboratory, White Oak, Maryland. It is intended primarily to aid in standardizing the testing procedure and as a guide for further development in this field. (Author).

Free oscillation pitch-damping measurements were made on a nine degree half-angle cone at a Mach number of 8.0. The report discusses the design of the support, the water cooling system and its effectiveness in controlling the thermal environment of the bearings. In addition, an outline is given of a theoretical technique for calculation of the damping in pitch derivative for slender cones called the shock expansion method. Comparisons are made between theory and experiment. (Author).

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