Originally Posted By: paul
The physics are the same, paul. A rocket engine is, afterall, just a lumpy tube.

then what is the velocity of the air that will come out of the
streamlined tube.

I've answered this many times - whatever the speed of sound is, given the gas mixture in the tube and the temperature/pressure that gas is at.

The effective Ve however is zero, as outlined in my previous posts, as air is not an ideal gas.