Less complexity and cost compared to liquid fuel and it's complex, expensive engines
The two main types of rocket engines are Solid fuel rocket engines and Liquid fuel rocket engines.
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There are several types of rocket motors, including solid rocket motors, liquid rocket engines, and hybrid rocket engines. Solid rocket motors use a solid propellant that burns uniformly, providing thrust until the fuel is consumed. Liquid rocket engines utilize liquid fuel and oxidizer, allowing for adjustable thrust and the ability to shut down and restart. Hybrid rocket engines combine aspects of both, using a solid fuel and a liquid oxidizer, offering some advantages in performance and safety.
Liquid hydrogen is a common fuel used in rocket engines.
There are two main types of rocket engines: Solid fuel and liquid fuel. Liquid fuel rocket engines are usually considered significantly better than solid propulsion units, however, they are also significantly more expensive.
Answer The Space Shuttle is a rocket. By definition, a Rocket is a vehicle that burns gas that it carries with it. Where as, a jet airplane burns the oxygen from the air and is not a rocket. The Rocket when it is launched has a liquid fuel rocket engines at the back end of it. It also has two long, solid fuel rocket engines that separate after launch. But the space shuttle is pulled by a rocket.
A rocket's fuel is typically located in large tanks situated within the rocket's body. The fuel is stored separately from the rocket's engines and is used as propellant for thrust during launch and flight.
A single stage rocket consists of only a single set of rocket engines and fuel containers. This assembly is used for the entire journey. A multistage rocket consists of several sets of engines and fuel containers that are used in succession. When the fuel of one stage is spent it detaches from the rocket to get rid of the weight and the next set of engines is ignited. Multistage rockets are far more efficient at getting things into space.
Rocket engines that can obtain forward momentum with fuel additives include hybrid rocket engines, which use a combination of solid and liquid or gaseous oxidizers. These engines can enhance performance and efficiency by introducing additives like nitric oxide or hydroxyl-terminated polybutadiene (HTPB) into the fuel mix. Additionally, some liquid rocket engines utilize additives in their propellants to improve combustion characteristics and thrust. Overall, the use of fuel additives can optimize engine performance and enable more efficient propulsion.
As regards the main engines on the rocket, there is an ignitor associated with each rocket motor. An internal "blowtorch" of fuel and oxidizer in each engine is ignited with spark plugs.
Liquid rocket engines would act much like a car engine. More fuel, more thrust. Solid rocket engines are either on or off. No throttle control.