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[Aerospace Engineering] 1. Aerodynamics : (a) how to find zero lift line of a wing and airfoil? (b)...

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Mechanical Engineering

[Aerospace Engineering]

1. Aerodynamics :

(a) how to find zero lift line of a wing and airfoil?

(b) how do we relate this with climb angle(gamma), pitch angle(theta), angle of incidence, and Angle of Attack(Alpha)

(c) why during climb Theta is not considered as Angle of attack since the aircraft moves with respect to x-axis? or is that with respect to thrust direction?

(d) then can we classify Angle of Attack to be similar with Angle of Incidence if the aircraft flies along the direction of thrust?

2. Flight Mechanics :

a) what is the differences between stick-fixed and stick-free? (including explanation on each)

b) consider that the aircraft flies in autopilot mode, is that considered as stick-fixed,free, or neither?

c) Consider Horizontal stabiliser on conventional aircraft, how to find these variables? given

C_LT = 2*phi*Alpha_Teffective + a2(eta) +a3(beta), ; C_LT is known, Aileron hinge location x1/c = 0.65 and Trim Tab hinge at x2/c = 0.8

C_H = b1*Alpha_Teffective + b2(eta) + a2(beta), ;beta = Trim tab deflection angle; eta = Elevator deflection angle

 

Answer & Explanation Solved by verified expert
4.4 Ratings (752 Votes)
1a The main difference between the wing and the airfoil inaerodynamics is the airfoil is a 2D shape of the wing where asthe wing is 3D    See Answer
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