Test Stand at Night
A Raptor engine firing sideways off a test stand at night, the first time one was ever run.
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This was the first test firing of a Raptor engine, run sideways off a stand at night on 25 September 2016. An engine is bolted down and run before it is trusted to fly, and the ground run is made deliberately harder than the flight: longer than a mission needs, and past the power a launch calls for, so the margin is proven here rather than discovered in the air.
Three bright shock diamonds sit in a row at the left, stepping down in size away from the nozzle, before the plume opens out and runs blue to violet to orange across the right two thirds of the frame. Almost nothing here clips to white, so the diamonds keep their separation instead of collapsing into one core.