Electric rocket engine gimbals.
For their latest Starship Super-Heavy booster, the first U.S. rocket to exceed the ancient Saturn-V moon rocket in payload capacity, SpaceX has switched from hydraulic actuators to fully-electronic control of electric actuators for moving the gimbals on the huge engines. And they are fast!
This video is a shorter version of one originally posted on 1 Minute Things, but it has been moved here since it deals with electric and electronic systems. The original was itself an enhanced excerpt from the first 2024 SpaceX update presentation by Elon Musk at Starbase in Boca Chica, Texas, in early 2024.
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credit: SpaceX