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The video is captioned with reasons for each failed episode, which includes running out of hydraulic fluid, running out of liquid oxygen, a sticky throttle valve, and engine sensor failure among them.

SpaceX’s founder, Elon Musk, in a tweet to his two million followers, attributed the accident to a “slower than expected throttle valve response.”

Rowland happily took a break from polishing the 611’s throttle valve to explain how the engine works and why it remains state-of-the-art in steam technology.

Such an action may occur from undue friction in the parts of the governor or of its throttle valve.

When the engineer opens the throttle valve the cylinder is instantly filled with steam, creating a vacuum to that extent in the boiler.