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

AI Thread Summary
The discussion focuses on the exit velocity of gas from rocket nozzles, specifically referencing the Space Shuttle's main engines and solid boosters. The sea level specific impulse (Isp) for the shuttle's main engines is approximately 4300 m/s, while the solid boosters produce an exit velocity around 2400 m/s. Most large rocket motors typically fall within this range of exit velocities. The conversation emphasizes the importance of understanding specific impulse and its relation to exit velocity calculations. Overall, the average gas exit speed from rocket nozzles varies significantly based on engine type and design.
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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