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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When they test rocket thrust, they often mount them sideways against a barrier, and the engine is bolted to the ground. For vertical tests, they bolt them and usually have something above the rocket as well.
Using math, they *generally* know how much thrust force the rocket will most likely have. So they know what is needed to counteract that in order to keep the rocket from zooming away. There’s never gonna be an incident where the rocket is so hugely powerful that they had no idea it was that strong.
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