An aircraft designer is considering the design of an aircraft wing. The wing is to be straight and is to have the same airfoil section all the way along the span; this 2D section has a lift curve slope of 5.9 per radian and a zero-lift angle of attack of -1.2°. It can be assumed that the span efficiency factor will be equal to 0.9. It is proposed that the aircraft will be cruising at Mach 0.57 at an 5° angle of attack. a) Calculate the 3D lift coefficient if: a. The wing area is 170m2 and the wingspan is 40m. b. The wing area is 170m2 and the wingspan is 25m. b) What is the key disadvantage of a low aspect ratio wing for subsonic aircraft?
An aircraft designer is considering the design of an aircraft wing. The wing is to be straight and is to have the same airfoil section all the way along the span; this 2D section has a lift curve slope of 5.9 per radian and a zero-lift angle of attack of -1.2°. It can be assumed that the span efficiency factor will be equal to 0.9. It is proposed that the aircraft will be cruising at Mach 0.57 at an 5° angle of attack. a) Calculate the 3D lift coefficient if: a. The wing area is 170m2 and the wingspan is 40m. b. The wing area is 170m2 and the wingspan is 25m. b) What is the key disadvantage of a low aspect ratio wing for subsonic aircraft?
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An aircraft designer is considering the design of an aircraft wing. The wing is to be straight and is to have the same airfoil section all the way along the span; this 2D section has a lift curve slope of 5.9 per radian and a zero-lift angle of attack of -1.2°. It can be assumed that the span efficiency factor will be equal to 0.9. It is proposed that the aircraft will be cruising at Mach 0.57 at an 5° angle of attack.
a) Calculate the 3D lift coefficient if:
a. The wing area is 170m2 and the wingspan is 40m.
b. The wing area is 170m2 and the wingspan is 25m.
b) What is the key disadvantage of a low aspect ratio wing for subsonic aircraft?
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