How fast, on average, does the gas come out of a rocket's nozzle?

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SUMMARY

The average exit velocity of gas from a rocket nozzle varies significantly between different engines. For the Space Shuttle's main engines, the exit velocity is approximately 4300 m/s, while the solid rocket boosters achieve around 2400 m/s. These figures are derived from the specific impulse (Isp) at sea level, which is critical for understanding rocket performance. Most large rocket motors typically fall within this velocity range.

PREREQUISITES
  • Understanding of specific impulse (Isp) in rocketry
  • Familiarity with rocket propulsion principles
  • Knowledge of liquid hydrogen and oxygen as propellants
  • Basic grasp of fluid dynamics and gas exit velocity equations
NEXT STEPS
  • Research the specific impulse (Isp) of various rocket engines
  • Study the equations governing exit velocity in rocket nozzles
  • Explore the differences between liquid and solid rocket propulsion systems
  • Investigate the performance characteristics of large rocket motors
USEFUL FOR

Aerospace engineers, rocket propulsion specialists, and students studying rocketry and fluid dynamics will benefit from this discussion.

Ralphonsicus
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For example, in the SSET (Space Shuttle External Tank), how fast does the burnt fuel (liquid hydrogen and oxygen) exit the nozzle at its bottom?
 
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For a shuttle main engine, about 4300 m/s (if I'm remembering right...). For the solid boosters attached to the shuttle, it's more like 2400 m/s. Most large rocket motors will fall somewhere in this range.
 

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