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This the general question. the diagram is kinda missing Consider a Boeing 727 flying at 5000m under standard atmospheric conditions associated with...

This the general question. the diagram is kinda missing


Consider a Boeing 727 flying at 5000m under standard atmospheric conditions associated with that altitude. It


is flying with a velocity of 810 km/hr.


The reference wing area S: 149 m2


The span b: 34.5 m


The span efficiency factor e1: 0.82


The profile drag coefficient (Cd) at 3 degrees angle-of-attack: 0.0062


Also known is:


The air density at h=5000m: ρ∞=0.736 kg/m3


The temperature at h=5000m: T∞=255.7 K


The static pressure at h=5000m: p∞=5.41⋅104 N/m2


The specific heat coefficient at constant pressure: cp=1008 J/kg K


Assume that the lift gradient of the wing under the actual flight conditions is 0.1179 per degree. 


D) Calculate the lift-drag ratio of the wing at an angle of attack of 3 degrees.

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