Aerospike
Aerospike is a type of rocket engine that uses a combination of solid and liquid propellants. The solid propellant is used as the main source of thrust, while the liquid propellant is used to control the engine's power output. The aerospike engine has a unique bell-shaped nozzle that allows it to maintain high levels of efficiency at a wide range of altitudes and speeds. This makes it an ideal choice for spacecraft that need to operate in different environments, such as low Earth orbit or deep space. The aerospike engine was first developed in the 1960s, but it has yet to be widely adopted due to its complexity and high cost.
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