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Which of the following is correct for nacelle form factor (FF)?

Which of the following is correct for nacelle form factor (FF)? Correct Answer FF = 1+(0.35/f)

Form factor will be different for different components of an aircraft. For nacelle, form factor can be estimated as follows: Form factor FF = 1 + (0.35/f). Where, f = length/maximum diameter = fineness ratio.

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