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Aerodynamics is the study of how air moves and interacts with solid objects. It is an essential part of aircraft design.

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Could bypass air be used to cool a rocket engine like in turbofans?

There is a potential bonus though - entrained air flow could be used to increase thrust in the similar way to how a bypass fan works - The total thrust is $ \sqrt(2 \nu P ) $ where $\nu$ is the total …
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