What is the stall speed with Flaps LAND (DOWN)/Idle (Vs0)?

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Multiple Choice

What is the stall speed with Flaps LAND (DOWN)/Idle (Vs0)?

Stall speed in the landing configuration is the speed at which the aircraft will stall when the flaps are fully down and the power is idle. Flaps down increase the wing’s lift at low speeds, so the airplane can fly slower before reaching the critical angle of attack. With idle power there’s no thrust-induced airflow over the wing to help delay the stall, so this combination yields the lowest stall speed for that airplane and weight. For this question, the data specify 81 knots as the stall speed in that landing configuration, which is why that option is correct. The other numbers would correspond to different conditions (such as a different power setting or flap configuration) and don’t apply to the stated scenario.

Stall speed in the landing configuration is the speed at which the aircraft will stall when the flaps are fully down and the power is idle. Flaps down increase the wing’s lift at low speeds, so the airplane can fly slower before reaching the critical angle of attack. With idle power there’s no thrust-induced airflow over the wing to help delay the stall, so this combination yields the lowest stall speed for that airplane and weight.

For this question, the data specify 81 knots as the stall speed in that landing configuration, which is why that option is correct. The other numbers would correspond to different conditions (such as a different power setting or flap configuration) and don’t apply to the stated scenario.

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