3. Technological & Economic Feasibility
There are three principal factors which determine both the technical and economic feasibility and hence the potential commercial viability, of all conventionally powered jet powered Aircraft of today. These are:
- 3.1 The Aerodynamic Efficiencyof the Aircraft's airframe inclusive of its engines.
- 3.2 The Propulsion System It is the size, the thermal, and the mechanical efficiencies which determine the quantity of thrust delivered to the Aircraft per unit weight of fuel, per unit of time, at all demand conditions.
- 3.3 The Motion/Propulsive Efficiencyof the Aircraft's Air Mass Motion System. This is determined by the difference between the velocities of the Air Mass caused to accelerate rearwards through the Aircraft by its engine (henceforth referred to as AIR MASS MOTION SYSTEM No.1) and that of the Air Mass caused to accelerate rearward around the Aircraft (henceforth referred to as AIR MASS MOTION SYSTEM.2) relative to, the RESULTANT Aircraft Velocity at any demand condition.
Note
Conventional Jet Powered Aircraft in the sense used here, is, one in which it is powered by either a pure, bypass, fan, or variable cycle type of jet engine. We shall confine ourselves to considering only conventionally propelled Aircraft because, it is here that the greatest economic and commercial gains can be made.
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