Aircraft Wing Design

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Questions and Answers

What is the purpose of washout on a wing?

  • To increase lift at the wing root
  • To increase the angle of incidence
  • To decrease lift at the wing tips
  • To compensate for the higher levels of loading experienced at the wing tips (correct)

What is the upward inclination of a wing from the root to the tip?

  • Dihedral (correct)
  • Angle of attack
  • Washout
  • Anhedral

What is the formula for lift?

  • ½RV²SCL (correct)
  • RV²S²CL
  • RV³SCL
  • ¼RV²SCL

What is the angle of attack?

<p>The angle between the chord line of an aerofoil and the relative airflow (C)</p> Signup and view all the answers

What is the coefficient of lift (CL)?

<p>The lifting ability of a particular wing (C)</p> Signup and view all the answers

What is anhedral?

<p>The downward inclination of a wing from the root to the tip (A)</p> Signup and view all the answers

What is the primary reason for the difference in drag curve between a jet aircraft and a piston aircraft?

<p>Swept wings are designed to achieve high cruise speeds (C)</p> Signup and view all the answers

How does the drag curve of a jet aircraft compare to that of a piston aircraft?

<p>It is flatter and has a smaller total drag range (D)</p> Signup and view all the answers

What is the effect of the swept wing design on the lift capabilities of a jet aircraft?

<p>It decreases the lift capabilities at low speeds (D)</p> Signup and view all the answers

What is the relationship between induced drag and lift?

<p>Induced drag is proportional to lift (D)</p> Signup and view all the answers

What is the primary reason for imposing a reduced Mach maximum operating speed in the event of a Mach trimmer failure?

<p>To maintain a margin below the Mach speed at which instability occurs (C)</p> Signup and view all the answers

What is the consequence of the flatter total drag curve on a jet aircraft?

<p>A vague lack of speed stability (A)</p> Signup and view all the answers

What is the main characteristic of the drag curve on a jet aircraft?

<p>It is flatter and has a smaller total drag range (C)</p> Signup and view all the answers

What is the result of compressibility on an airfoil?

<p>A disturbance in the pressure pattern and shock-wave/drag effect (B)</p> Signup and view all the answers

What is the main effect of compressibility on flight instruments?

<p>An overread error on the air speed indicator (C)</p> Signup and view all the answers

What is the critical Mach number associated with?

<p>The shock-wave/drag effect on the wing (D)</p> Signup and view all the answers

What is the difference between VNO and VNE?

<p>VNO is the normal operating speed, while VNE is the never exceeded speed (C)</p> Signup and view all the answers

What is the purpose of a speed margin?

<p>To allow for aircraft testing at higher speeds (D)</p> Signup and view all the answers

What is the top end of an aircraft's speed range determined by?

<p>VDF/MDF speed (C)</p> Signup and view all the answers

What is the lower speed limit of an aircraft's maneuverability margin/envelope?

<p>1.2/3 VS speed (B)</p> Signup and view all the answers

What occurs at an aircraft's absolute ceiling?

<p>Coffin corner (C)</p> Signup and view all the answers

What is the relationship between IAS and Mach number?

<p>IAS decreases with altitude, Mach number increases (A)</p> Signup and view all the answers

Why does the Mach number need to be increased to prevent stall?

<p>To prevent stall speed (D)</p> Signup and view all the answers

What is the relationship between temperature and LSS?

<p>LSS decreases with temperature (B)</p> Signup and view all the answers

What is the primary purpose of a yaw damper in an aircraft?

<p>To supplement Dutch roll control (A)</p> Signup and view all the answers

What is the main difference between a parallel yaw damper and a series yaw damper?

<p>The way it moves the rudder pedals (C)</p> Signup and view all the answers

What is the advantage of a series yaw damper over a parallel yaw damper?

<p>It does not increase rudder foot forces (A)</p> Signup and view all the answers

In what scenario would a parallel yaw damper typically be switched off?

<p>During takeoffs and landings (A)</p> Signup and view all the answers

What is the relationship between a roll damper and spiral stability?

<p>A roll damper is associated with providing spiral stability (A)</p> Signup and view all the answers

What is the visual indication of a parallel yaw damper's serviceability?

<p>Rudder bar activity (A)</p> Signup and view all the answers

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