6. The Modern Fan Jet Engine
This type of Engine is regarded by this vast Industry as the ultimate solution to the poor Propulsive Efficiency resulting from the total lack of any integrated Motion Gearing between, the ACTION and REACTION halves of an existing Jet Powered Aircraft's, Motion System. How can this possibly be so? The incorporation of the Fan as an integral working part of the core engine of a modern Fan Jet Engine more than doubled the weight of the core engine. The Resultant Air Mass product delivered by the engine Fan forms the major part of the ACTION half (Air Mass Motion System No.1) of the Aircraft's, Motion System. Consequently, the only Motion influence the Fan could possibly have upon the Aircraft's Motion is limited in effect to the REACTION half of its Motion System. In spite of all the technological brilliance and having spent billions of £'s in developing the bypass, variable cycle, and fan concepts of jet engines and their associated Aircraft a Jet Powered Aircraft in taking off today is still required to use maximum thrust from, "brakes off". In other words, a Jet Powered Aircraft starts off and takes off, in "top gear".
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This vast Industry is guilty of focusing upon varying the cycle of the Air Mass Motion through the physical jet engine itself as the means of improving the propulsive efficiency of the Jet Powered Aircraft instead of upon establishing motion integration throughout the Aircraft's Air Mass Motion System comprising Air Mass Motion Systems No's 1 & 2 instead of through the Aircraft itself. While the variable cycle philosophy has an effect it is bound to prove to be economically insupportable for the simple reason that the resulting thrust effect is delivered to the Aircraft through it's steel mounting bolts. And, we simply cannot in this way match the thrust delivered to the Aircraft through it's steel mounting bolts to it's mass momentum state at all demand conditions which is what is needed. This is particularly true of a motion vehicle that is required to fly at supersonic and hypersonic flight speeds.
As things are, a reasonable state of Motion/Propulsive efficiency can still only be achieved over one very narrow range of operational conditions, namely, the cruise condition. Outside this range of operation the motion efficiency of any conventionally configured Jet Powered Aircraft (with the exception of a prop jet Aircraft) is very poor possessing as it does, in effect, less than the physical equivalent of a car with only two gears.
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