4. Aerodynamics.
According to the "Chambers Science & Technology Dictionary", Aerodynamics is defined as, "that part of the mechanics of fluids that deals with the dynamics of gases particularly, the study of forces acting upon bodies in motion in air". In the same reference, "Dynamics" (maths) is defined as "That branch of applied mathematics which studies the way in which force produces motion".
Here in this case, consideration is given to the ACTION of two distinctly different Air Mass Motion Systems No's 1 & 2 which are both caused to act and interact upon any Jet Powered Aircraft in motion/flight, and not just as the single acting Air Mass Motion System of conventional aeronautics.
Consider, "as things are", a Jet Powered Aircraft in reality, is caused in physical REACTION to fly forward between two entirely, differently acting, rearward flowing, Air Mass Motion Systems which together, form the Aircraft's Motion System .
The first of these Systems comprises an accelerating Air Mass created by the Jet Engine, the Reaction thrust effect of which is delivered to the Aircraft via the engine's mounting bolts. Because the engine now forms an integral part of the Aircraft's structure, Air Mass Motion System No.1 passing through it, it becomes the ACTION half of the Aircraft's, Air Mass Motion System. Here the Aircraft is doing work upon the air mass through which it is caused to pass.
Here in the second system work is done upon the Aircraft by the REACTION half of its Air Mass Motion System, i.e., the atmosphere, hereafter referred to as Air Mass Motion No.2 through which it is, in this way caused to fly at a Resultant Aircraft Velocity. Consequently, there will be propulsive thrust losses experienced by the Aircraft wherever the Air Mass Flow Velocities of either of these two halves of the Air Mass Motion System are greater or less than the Resultant Aircraft Velocity at any demand condition.
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