Vstall AoA range for Flaps Down: which of the following?

Vstall AoA range for Flaps Down: which of the following?

• A. 17-19
• B. 15-17
• C. 19-21
• D. 21-23

Answer: (A)

Stall occurs when the wing reaches its critical angle of attack, the point where it can no longer produce the needed lift to balance the aircraft’s weight. Flaps down change the wing’s lift characteristics by increasing camber, so the stall threshold in terms of angle of attack shifts with that configuration. For the C-5 in the flaps-down setting, the documented Vstall AoA range is 17 to 19 degrees. This range reflects real-world variation due to factors like weight, balance, and altitude, providing a safe envelope for when stall can occur with flaps down. Ranges like 15-17 or 19-21 would imply stall onset at angles outside the established flaps-down data, and ranges higher than 19-21 or 21-23 would place stall at significantly larger angles of attack than specified for this configuration.

Stall occurs when the wing reaches its critical angle of attack, the point where it can no longer produce the needed lift to balance the aircraft’s weight. Flaps down change the wing’s lift characteristics by increasing camber, so the stall threshold in terms of angle of attack shifts with that configuration. For the C-5 in the flaps-down setting, the documented Vstall AoA range is 17 to 19 degrees. This range reflects real-world variation due to factors like weight, balance, and altitude, providing a safe envelope for when stall can occur with flaps down.

Ranges like 15-17 or 19-21 would imply stall onset at angles outside the established flaps-down data, and ranges higher than 19-21 or 21-23 would place stall at significantly larger angles of attack than specified for this configuration.