To: SRR99
If you will refer to several threads above I stated that pressure is exerted at 90 degrees to the containing vessel and I also referenced a ram jet engine. Regarding the pressure acting at 90 degrees to the containing vessel this applies also to the DeLavall nozzle used on a rocket engine.
Some of the force is exerted at a vector in relation to the center line of the rocket engine so that some of the forward thrust is exerted by the expanding gas in the nozzle itself. However, the greatest forward thrust is exerted on the forward wall of the rocket engine or to be more specific at the fuel and oxidizer injection plate.
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The Cat