At a fixed angle of attack, what effect does increasing airspeed have on lift?

At a fixed angle of attack, what effect does increasing airspeed have on lift?

• A. Lift increases.
• B. Lift decreases.
• C. Lift remains unchanged due to AoA.
• D. Lift is unpredictable.

Answer: (A)

When the angle of attack is held constant, the lift produced by the wing increases as airspeed increases because lift depends on dynamic pressure, which grows with the square of velocity. The lift equation L = q S Cl, where q = 1/2 rho V^2, shows that if the angle of attack (and thus the lift coefficient Cl) stays essentially the same (below stall), lifting force scales with V^2. So doubling the airspeed makes lift roughly four times larger, assuming density and wing area stay constant. The other options aren’t correct because increasing speed does not reduce lift, nor does it leave lift unchanged, and the relationship is well-defined rather than unpredictable.

When the angle of attack is held constant, the lift produced by the wing increases as airspeed increases because lift depends on dynamic pressure, which grows with the square of velocity. The lift equation L = q S Cl, where q = 1/2 rho V^2, shows that if the angle of attack (and thus the lift coefficient Cl) stays essentially the same (below stall), lifting force scales with V^2. So doubling the airspeed makes lift roughly four times larger, assuming density and wing area stay constant. The other options aren’t correct because increasing speed does not reduce lift, nor does it leave lift unchanged, and the relationship is well-defined rather than unpredictable.