Question

Following diagram represents ________

(a) typical wind axis system

(b) drag polar

(c) lift curve slope

(d) thrust required curve

This question was addressed to me during an online exam.

My enquiry is from Longitudinal Static Stability and Control-1 in chapter Stability, Control, and Handling Qualities of Aircraft Design

Answer 1

Right answer is (a) typical wind axis system

For explanation I would say: A typical wind axis coordinate system is shown in the diagram. Drag polar is used to provide information about the aircraft drag characteristics. Lift curve is used to provide information about the lift variation of the aircraft wrt angle of attack.