Video Caption: LauncherOne is powered by two rocket engines—a single NewtonThree on the main stage and a single NewtonFour on the upper stage. Both engines are turbopump-fed, gas generator cycle, LOX/RP-1 engines developed in-house here at Virgin Orbit. In this test, the rocket engine gimbals–in other words, it pivots–over a large range of motion. In flight, gimbaling allows the rocket engine to change the direction of thrust–and thereby steer the rocket. We’ve added a diagram on the left hand side of the screen to show the orientation of the engine throughout the test.