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Following diagram represents _________ (a)lift induced thrust required

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Following diagram represents _________

(a) lift induced thrust required

(b) zero lift thrust required

(c) drag polar

(d) lift curve

The question was asked in an online interview.

I want to ask this question from Flight Mechanics in chapter Performance and Flight Mechanics of Aircraft Design

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Right option is (a) lift induced thrust required

Best explanation: Para below it Lift induced thrust required is shown in the diagram. Lift induced thrust required and zero lift thrust required are not equal, they are two different properties. Lift curve and drag polar is used to provide information of the lift variation and drag variation respectively.

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