The design of a rocket engine is achieved by balancing competing design parameters of: energy consumption, efficiency, thrust, specific impulse, thrust-to-weight ratio, and the life of the engine (i.e. the length of time the engine can be operated before it requires servicing). A properly designed rocket engine has a relatively high thrust-to-weight ratio, a high specific impulse, and a relatively long life. The first two design parameters are related, as an increase in thrust requires an increase in specific impulse in order to maintain the same level of energy consumption. Propellant valves and nozzle exit temperatures are some of the other important design parameters. The whole engine is very large and heavy, so thrust must be maximised.
Rocket engines have been used in the past to produce large amounts of thrust, both in ground-based rocketry and in stratospheric balloons. The first rocket engines were fuelled by gunpowder and lit by a spark. After the first rocket engines were built by the Russians in 1808, rockets were used to achieve ballistic flight (flight by the principles of classical Newtonian mechanics) – a flight free from the effects of gravity. Rocket engines were built for military purposes, first using gunpowder, but eventually substituted by more sophisticated engines fuelled by liquid propellants. Rockets have been used for space exploration, as well as for sending people and things into space. Rockets are the only vehicle propulsion system that can reach orbital speeds.
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