High speed video rocket mach diamond shock diamonds

Closeup of rocket fire in high speed, with a bit of a startup transient. The pulsing at the end is the purge gas pushing the extra propellant in the lines out. The rocket is hinged and is commanded to move slightly. The mach diamonds are a bit ugly because there was some minor throat damage early in the engine's life. 300 frames per second' played back at 1/10th speed.