This paper discusses the basics of the design of a preliminary LITVC (Liquid Injection Thrust vector control) system in today’s jet propulsion methods. In principle, several methods can be used, but because high-performance propellants produce very high temperatures and usually multiphase flow, thrust vector control methods that minimize contact between moving parts and propellant gases are preferred. Also, the technique of obtaining thrust vector control by the injection of liquid into the supersonic region of a rocket nozzle has been studied. A basic model of fluid-injection thrust vector control is developed. The analysis is done to show the effects of injectant and propellant properties on the performance of the vehicle. Aerothermochemical aspects are examined by predicting the performance of selected injections in combination with a hypothetical rocket propellant and nozzle. The idea of implying this method in the steering of terrestrial vehicles is also looked upon. This paper discusses the basics of the design of a preliminary LITVC (Liquid Injection Thrust vector control) system in today’s jet propulsion methods. In principle, several methods can be used, but because high-performance propellants produce very high temperatures and usually multiphase flow, thrust vector control methods that minimize contact between moving parts and propellant gases are preferred. Also, the technique of obtaining thrust vector control by the injection of liquid into the supersonic region of a rocket nozzle has been studied. A basic model of fluid-injection thrust vector control is developed. The analysis is done to show the effects of injectant and propellant properties on the performance of the vehicle. Aerothermochemical aspects are examined by predicting the performance of selected injections in combination with a hypothetical rocket propellant and nozzle. The idea of implying this method in the steering of terrestrial vehicles is also looked upon. This paper discusses the basics of the design of a preliminary LITVC (Liquid Injection Thrust vector control) system in today’s jet propulsion methods. In principle, several methods can be used, but because high-performance propellants produce very high temperatures and usually multiphase flow, thrust vector control methods that minimize contact between moving parts and propellant gases are preferred. Also, the technique of obtaining thrust vector control by the injection of liquid into the supersonic region of a rocket nozzle has been studied. A basic model of fluid-injection thrust vector control is developed. The analysis is done to show the effects of injectant and propellant properties on the performance of the vehicle. Aerothermochemical aspects are examined by predicting the performance of selected injections in combination with a hypothetical rocket propellant and nozzle. The idea of implying this method in the steering of terrestrial vehicles is also looked upon.