Card Set Information

2013-11-18 19:52:19

Show Answers:

  1. Can an aircraft that is not stalled be in a spin?
    No. Both stall and yaw must be present to spin
  2. Define spin axis
    Aerodynamic point around which stall and yaw forces act to sustain spin rotation
  3. Define poststall gyration
    • Aerodynamic forces during stall that result in movement around the pitch, roll and yaw axes
    • Can introduce yaw and spin entry
    • Higher the airspeed - greater the poststall gyration tendency
    • Lower the airspeed - Less the poststall gyration tendency
  4. What is the key factor affecting the intensity of poststall gyrations?
    The airspeed at the time of stall
  5. What is the definition of angle of attack (AOA)?
    The angle between the chordline and the relative wind
  6. In a spin, which wing will have the higher AOA, up-going (outside wing) or down-going (inside wing)?
    Down-going (inside) wing
  7. What is the cause of autorotation in a spin?
    Unequal lift and drag forces acting on each wing
  8. How does pitch affect spins?
    Lower the pitch results in higher rotation rate
  9. If stalled and yawed, an aircraft pulling positive or negative G's, would enter a inverted spin?
    Negative G's + stalled and yawed= inverted spin
  10. Pro-Spin rudder:
    • Nose will pitch up
    • Lesser vertical component of drag acting on tail
    • Rotation rate slows, then, increases
  11. Anti-Spin rudder:
    • Nose will pitch down
    • Larger vertical component of drag acting on the tail
    • Rotation rate increases, then, decreases
  12. How does anti-spin rudder aid in recovery?
    Slows rotation and decreases AOA
  13. Would an aircraft spinning with the stick other than full aft be in an accelerated or unaccelerated spin?
    Anytime the aircraft is spinning with the stick other than full aft, the spin is accelerated
  14. Progressive spin
    • Caused by maintaining full up elevator while holding anti-spin rudder
    • Characterized by lowering of the nose and spin direction reversal
  15. Aggravated spin
    • Caused by maintaining pro-spin rudder and moving stick forward of neutral
    • Characterized by immediate increase in nose-down pitch and increased roll rate
  16. Lighter aircraft spin characteristics
    • Faster spin entry
    • Increased oscillations
    • Faster recovery
  17. Heavier Aircraft spin characteristics
    • Slower spin entry
    • Less oscillations
    • Slower recovery
  18. For any given power setting, stall speed varies inversely with pitch attitude:
    • Low pitch attitude=higher stall speed=faster entry with more oscillations
    • High pitch attitude=slower stall speed=slower entry with fewer oscillations
  19. Flying at a given pitch attitude, stall speed varies inversely with power setting:
    • Low power setting=higher stall speed=faster entry with more oscillations
    • High power setting=slower stall speed=slower entry with fewer oscillations
  20. Right spin
    • Stabilizes at lower pitch
    • Stabilizes slower with more oscillations
    • Rotation rate increased
  21. Left spin
    • Stabilizes at higher pitch
    • Stabilizes faster with less oscillation
    • Rotation rate decreased
  22. What causes the variance in left and right spin characteristics?
    Gyroscopic effect of the propeller
  23. How does the introduction of yaw affect the lift and drag of a stalled wing?
    Causes asymmetrical lift and drag between the outside and inside wing
  24. What is the main aerodynamic factor affecting spins?
    Conservation of angular momentum
  25. How can a progressive spin be entered?
    By maintaining full aft stick while applying and holding anti-spin rudder