A concept sketch of a fictitious 2-seat Light Sport Aircraft The sketch below shows a plan view of the two-seat conceptual Light Sport Aircraft (LSA) that we used in the drag study covered in Part 9 to calculate the total drag variation with velocity. We will be using the drag plot created in Part 9 for this tutorial, so it is recommended that you read through Part 9 before continuing. In Part 9 we completed a drag polar and plotted the total aircraft drag variation with the aircraft velocity, assuming that the aircraft was flying at sea level in a standard atmosphere. This is the final installment of this Fundamentals of Aircraft Design Series. By superimposing this thrust curve onto the drag graph, we can calculate the aircraft’s theoretical maximum speed, or the aircraft's speed at various engine power settings. In this tutorial we build on from the drag estimation, and specify an engine and propeller combination in order to determine the variation in thrust with airspeed. In Part 9 we completed a preliminary drag estimation of a new light sport aircraft design. Welcome to Part 10, the final installment in the Fundamentals of Aircraft Design series.
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