Provide thrust ... which changes velocity.
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rocket engines,compared to jet engines
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.
rocket what? an engine?, need to know the year and engine size.
There are actually two types of boosters that were both used by the space shuttle before their decommission. To propel the vehicle out into space from the surface of the earth out past the atmosphere, the shuttle used SRB's, or Solid Rocket Boosters. The engines on the actual shuttle are LRB's, or Liquid Rocket Boosters. These are used to propel the space vehicle further into space and into orbit around the earth.
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