Posted: February 16th, 2017
For this week’s assignment you will revisit your data from previous exercises, therefore please make sure to review your results from the last modules and any feedback that you may have received on your work, in order to prevent continuing with faulty data.
In this first part we will utilize the drag table that you prepared in module 4.
Notice that the total drag column, if plotted against the associated speeds, will give you a drag curve in quite similar way to the example curves (e.g. Fig 5.15) in the textbook. (Please go ahead and draw/sketch your curve in a coordinate system or use the Excel diagram functions to depict your curve, if so desired for your own visualization and/or understanding of your further work.)
Notice also that this total drag curve directly depicts the thrust required when it comes to performance considerations; i.e. as discussed on pp. 81 through 83, in equilibrium flight, thrust has to equal drag, and therefore, the thrust required at any given speed is equal to the total drag of the airplane at that speed.
Last but not least, notice also that, so far, in our analysis and derivation of the drag table in module 4, we haven’t at all considered what type of powerplant will be driving our aircraft. For all practical purposes, we could use any propulsion system we wanted and still would come up with the same fundamental drag curve, because it is only based on the design and shape of the aircraft wings.
Therefore, let’s assume that we were to power our previously modeled aircraft with a jet engine.
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