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air drag angular deflection asphaltic concrete back angle boots consequently corresponding earth curves degrees see fig denote earth and lunar EARTH AND SIMULATED earth conditions earth gravity tests earth walking effects of lunar energy expenditure evaluate feet 46 feet per second figure Figure 17 film supplement L-896 friction ft/sec higher speeds hip angle indicate investigation km/hr knee angle Langley Research Center lg and l/6g locomotive gaits locomotive index loping gait lunar condition lunar explorer lunar gaits lunar gravity conditions lunar gravity tests lunar locomotion lunar walking MAN'S WALKING maximum walking motion-picture camera NASA TN natural pace plotted against velocity pounds primary motions relative motion running gaits second 1.2 m/sec second 3 m/sec self-locomotion simulated lunar gravity slings space suit Spady spring constant sprinting gait stepping rate stickmen striding motion support cables support system test subject trolley various body members velocity at lg walking and running walking speed walkway