In a previous post about rocket and jet engines I made the claim that it was not the exhaust gasses that resulted in thrust but it was the force exerted on the forward wall of the combuster which is mechanically attached to the airframe structure via the engine assembly. I used a balloon analogy as well as a rocket engine description. I was told that I was full of it. Well it seems that Pratt and Whitney agrees with me even if the supporters of the Roll Royce textbook don't. I would strongly suggest that you look at the above P&W website. You might learn something.
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The Cat