Picture Number Unknown Picture Number Unknown Picture Number Unknown Picture Number Unknown Picture Number Unknown Picture Number Unknown Picture Number Unknown Picture Number Unknown Picture Number Unknown Picture Number Unknown Picture Number Unknown Ramjet mockup. Picture Number Unknown Picture Number Unknown Picture Number Unknown White ablative coating developed by Martin-Marietta to remove heat by reflection, insulation and charring. 67-h-1129.jpg 68-hc-320.jpg Picture Number Unknown ECN-1736.jpg Lid covers left windshield, opens prior to landing approach. naap6-15-1.jpg The two 25 ft propellant tanks were added to increase the speed to more than 5,000 mph. The tanks are jettisoned when the X-15 reaches 1,400 mph.Picture Number Unknown Picture Number Unknown Picture Number Unknown 11-03-65.jpg E-17242.jpg Picture Number Unknown Picture Number Unknown Picture Number Unknown Picture Number Unknown Picture Number Unknown