Either a propulsion system or a complete vehicle driven by such a propulsive engine. A rocket engine provides the means whereby chemical matter is burned to release the energy stored in it and the energy expended, in this example, by ejection at high velocity of the products of combustion (the working fluid). The ejection imparts motion to the vehicle in a direction opposite to that of the ejected matter. A rocket vehicle is propelled by rocket reaction and includes all components necessary for such propulsion, a payload such as an explosive charge, scientific instruments, or a human crew. A rocket vehicle also includes guidance and control equipment mounted in a structural airframe or spaceframe.