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Engineering · Mechanical Engineering
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Wing and tail of an aircraft have same airfoil section. The distance between two aerodynamic centers is equal to wing semi-span (b/2). In addition, following data is applicable CLa 0.08/deg, CMac,wb-0.0218, b-29.2 m, c 2.8m, For Tail: Eo-0.0, ea 0.3, n 0.9, i-2.1°, S 0.3S. The symbols have their usual aerodynamic interpretation What is the value of Zero Lift Moment Coefficient CMo for this ircraft? (A) 0.2410 (C)-0.2410 (B) 0.2147 (D) -0.2147 For the aircraft in above question, what is the maximum distance by which Center of gravity can be behind Aerodynamic center without destabilizing the aircraft? (A) 1.55 m (C) 9.56 m (B) 3.26 m (D) 2.76 m In above question, what would be the separation between Wing-body Aerodynamic Center and Centre of Gravity of aircraft for 10% Static Margin? (A) 2.47 m (C) 3.54 m (B) 0.28 m (D) 2.76 mm How much change in CMc is expected for per unit deflection of elevator? (Take Ci 0.04/deg) (A) -0.06257 (C) -0.04615 (B) +0.06257 (D) +0.04615 In above question, how much elevator deflection is required to trim the aircraft at 3.2° angle of attack for 10% Static Margin? (A) +5.95 (C) +3.02 (B) +7.82 (D) None of These
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