ELi5 How does a rocket not fly away when testing thrust?

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I see the thrust of rocket engines, and things like vector engines, being tested a lot at the moment with all the Space X stuff happening. How come these rockets that are testing their thrust don’t actually lift off? They don’t appear to be held down so well as to not let the thrust overpower it.

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Anonymous 0 Comments

They’re bolted down with the same mounting points that would be used to attach the engine to the rocket.

Sometimes they’re test fired while attached to the rocket, in which case there are clamps or bolts holding the rocket to the pad.

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