GRGR (20) Part 3, Episode 13: Notes, Part 1 of 2

[Michael Perez]

Mark wrote:
"In the atmosphere, the exhaust gases can't expand as rapidly because
they have to expand against the pressure of the surrounding air -- the
exhaust cannot exit the venturi as fast, raising pressure within the
combustion chamber above the venturi (a bit), reducing (a bit) the
velocity of gas in the venturi, and constricting the expanding cone of
expelled gas beneath the rocket."

I'm not a rocket scientist, either, (far from it) only remembering from
elementary and junior high explanations of newsworthy rocket launches. 
However, I did not mean that the thrust generated by "pushing," which I
did mean to put in quotes because it was a simplistic way to portray
what you said much more eloquently about the exhaust gases expanding
"against the pressure of the surrounding air," was all that significant
physically, only conceptually.  You may be right about the wind
reference being about the air around the rocket rather than behind. 
The wind appears a lot in GR and I haven't got a handle on how the wind
references tie together if at all.

Michael 
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