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</p> Signup and view all the answers

    What is the coefficient of lift (CL)?

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

    What is anhedral?

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

    What is the relationship between induced drag and lift?

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

    What is the critical Mach number associated with?

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

    What is the purpose of a speed margin?

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

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

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

    What occurs at an aircraft's absolute ceiling?

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

    What is the relationship between IAS and Mach number?

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

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

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

    What is the relationship between temperature and LSS?

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

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

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

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

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

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