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[b]NASA and ATK test five-segment solid rocket motor[/b] (Video quality artifact of original live stream). Credit: ATK During the test, DM-3's flame exited the motor at Mach 3 and burned for 125.6 seconds. The gas temperature inside the chamber was about 5,630 degrees Fahrenheit. The temperature of the flame escaping the nozzle approached 4,500 degrees F, approximately two-thirds the temperature of the Sun. At that temperature, steel does not just melt, it boils. Following the test, the motor was sprayed with 2,300 gallons of water per minute until the cases are cooled from 1,000 F to 300 F. The quench systems sprayed 30,000 pounds of carbon dioxide gas into the nozzle exit cone to stop the burning.
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