Figures 18-21 are plots of some data recorded during the flight tests. These data are typical of the flight test data and are included to show the similarity with the laboratory data. These plots cannot be compared directly with any of the other data presented here for the same reasons given in the paragraph on drop tests. They do show, however, that similar data is obtained from the three test methods (roller plate platforms, shuttle plate, and flight test) so long as there is no requirement for running over deck obstructions. When this requirement is present, the shuttle plate provides the better and more economical method. Conclusions