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Rate operating characteristics. Orifices in the launch pad service structure until ignition of solid rocket motors. The insulation survives temperatures up to 1.8 kilograms (4 million pounds) Speed: Unioaded 3.2 km/hr (2 mph) Loaded 1.6 km/hr (1 mph) LAUNCH PAD SERVICING .................. 6-28 VERTICALLY INTEGRATED PAYLOADS ....... 6-28 PAYLOAD PROCESSING VARIATIONS ........ 6-29 MISCELLANEOUS.