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Cl vs Cd is called as _______________(a) drag polar(b) parasitic drag(c) total drag(d) no significanceThis question was posed to me during a job interview.I need to ask this question from Pressure Coefficient topic in section Inviscid & Incompressible Flow of Aerodynamics

Answer»

The correct ANSWER is (a) drag polar

For explanation I would SAY: It is CALLED drag polar and it gives the relation between the lift and drag of the aircraft. It describes the amount of lift generated per drag PRODUCED. Cl/Cd ratio must be HIGH. The amount of lift generated should be more with relatively less drag.



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