Further more scientific testing led them to find that there is a specific thrust to body-weight ratio that works best, with the direction of thrust about 25 degrees below horizontal. Through ...

Thrust Vector Control: A method used to control the direction of thrust produced by an engine, allowing for improved maneuverability. Nozzle Pressure Ratio (NPR): The ratio of the pressure at the ...

The problem was traced to the actuators that change the direction of thrust on the Vega's upper-stage engine. When they received commands from the guidance, navigation and control (GNC ...