Compare and contrast the best jet range profiles. Which is best and why? Constan

Question

Compare and contrast the best jet range profiles. Which is best and why?
Constant Mach, Constant Cruising Altitude. Constant Thrust, Constant Cruising Altitude. Decreasing Mach, Constant Cruising Altitude. Constant Mach, Increasing Altitude. Compare and contrast the best jet range profiles. Which is best and why?
Constant Mach, Constant Cruising Altitude. Constant Thrust, Constant Cruising Altitude. Decreasing Mach, Constant Cruising Altitude. Constant Mach, Increasing Altitude. Compare and contrast the best jet range profiles. Which is best and why?
Constant Mach, Constant Cruising Altitude. Constant Thrust, Constant Cruising Altitude. Decreasing Mach, Constant Cruising Altitude. Constant Mach, Increasing Altitude.

Explanation / Answer

Best range is more mile covered and less fuel consumed.
1-
At constant speed and cruising altitude can be inefficient on fuel economy. This setting doesn't take into account the efficiencies that could be gained by flying higher or reducing speed to maximize distance.(Not Best)
2-
It is very inefficient because it does not take into account the weight change of the aircraft.Two important changes in the flight schedule must be made by the pilot asweight decreases, if maximum range is to be obtained: The thrust and airspeed must be reduced.(Not Best)
3-
The aircraft incideance has to be steadily decreased as fuel is consumed, in such a way that the lift coefficient is directly proportional to the aircraft weight. in addition, the engine thrust needs to be steadily decreased during the course of the flight.In this profile the fuel consumption is obviously lowering to a more consistent rate for a longer flight.
4-
Increasing altitude will increase the range, up to the altitude where optimum engine efficiency is reached. Above that point, specific fuel consumption begins to increase, reducing range. This effect overwhelms any further increase from decreasing air density.(Best)

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