Aircraft Wings: Flap Types and Drag Measurements

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Questions and Answers

What happens to induced drag as the speed of the aircraft increases?

  • It increases (correct)
  • It remains constant
  • It decreases
  • It becomes negligible

What is the effect of a higher aspect ratio on induced drag?

  • It increases induced drag
  • It has no effect on induced drag
  • It depends on the air density
  • It decreases induced drag (correct)

What is the purpose of wing end plates?

  • To increase the wing's bending moment
  • To restrict tip vortices and reduce induced drag (correct)
  • To reduce parasite drag
  • To increase lift

How do tip tanks reduce induced drag?

<p>By restricting tip vortices and reducing the wing's bending moment (B)</p>
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What is the purpose of winglets?

<p>To generate a small forward force and reduce induced drag (B)</p>
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What is the relationship between lift and weight known as?

<p>Lift-to-weight ratio (C)</p>
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What is the primary cause of induced drag in an airfoil?

<p>The difference in air pressure above and below the wing (B)</p>
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What happens to induced drag as the aspect ratio of a wing increases?

<p>It decreases linearly (D)</p>
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What is the effect of increasing the angle of attack on induced drag?

<p>It increases induced drag (D)</p>
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What is the direction of the air movement from the bottom of the airfoil to the tips?

<p>Outward, away from the fuselage (B)</p>
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What is the effect of increasing air speed on induced drag?

<p>It decreases induced drag (B)</p>
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What is the relationship between lift and induced drag?

<p>Lift is proportional to induced drag (D)</p>
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What is the term for the drag due to frictional shear stress integrated over the surface?

<p>Skin Friction Drag (A)</p>
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What type of drag is associated with transonic and supersonic flow?

<p>Wave Drag (C)</p>
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What is the effect of doubling the indicated air speed on parasite drag?

<p>It will increase by a factor of four (D)</p>
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What is the term for the portion of total drag associated with skin friction and pressure drag due to flow separation?

<p>Parasite Drag (A)</p>
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What is the effect of airframe contamination on parasite drag?

<p>It will increase the parasite drag (B)</p>
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What is the term for the drag that exists when the airplane is at zero lift angle of attack?

<p>Zero-lift Drag (C)</p>
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