Author Topic: Rocket Engine Q&A  (Read 251221 times)

Offline Proponent

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Re: Rocket Engine Q&A
« Reply #760 on: 01/10/2018 02:05 AM »
... the escaping gasses apply force against the side of the combustion chamber opposite from the hole in the chamber that lets the gasses escape.

At points within the chamber or nozzle where the internal pressure exceeds the ambient pressure, diverging sections (including the top of the combustion chamber) contribute to thrust while converging sections detract.  Where ambient pressure exceeds internal pressure, as is the case in the tail end of an over-expanded nozzle, it's the other way around.