Which device decreases stall speed?

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Study for the Principles of Flight Test. Learn with flashcards and multiple-choice questions, each question includes hints and explanations. Prepare for your exam with confidence!

Multiple Choice

Which device decreases stall speed?

Explanation:
Extending flaps increases the wing’s lift at a given airspeed by increasing camber and the lift coefficient. That extra lift means the wing can support flight at a lower speed, so the stall speed drops. Flaps also add drag, but the key effect for stall speed is the higher lift at lower speeds. The other surfaces don’t raise the lift coefficient in the same way. Ailerons primarily affect roll, elevator changes pitch, and the rudder controls yaw; none of theseIncrease the wing’s ability to generate lift at a lower speed, so they don’t meaningfully reduce stall speed.

Extending flaps increases the wing’s lift at a given airspeed by increasing camber and the lift coefficient. That extra lift means the wing can support flight at a lower speed, so the stall speed drops. Flaps also add drag, but the key effect for stall speed is the higher lift at lower speeds.

The other surfaces don’t raise the lift coefficient in the same way. Ailerons primarily affect roll, elevator changes pitch, and the rudder controls yaw; none of theseIncrease the wing’s ability to generate lift at a lower speed, so they don’t meaningfully reduce stall speed.

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