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AEDC PHOTO #59-999

ALTITUDE CHUFFING WAS DISCOVERED here in first full-scale solid propellant rocket firing. Tests were on the third stage motor for Projects Able and Vanguard, both early space programs. Motion picture sequence shows from top, burning terminates; shock diamond moves upstream into nozzle; nozzle glows but no thrust is generated; propellant re-ignites and produces thrust.

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