How does increased aircraft weight affect stall speed?

Question

Accepted Answer

Stall speed increases because the wing must generate more lift, requiring a higher speed to avoid the critical AOA.. Stall occurs at the critical angle of attack regardless of weight, but the speed at which that critical AOA is reached increases with weight. A heavier aircraft must fly faster to generate sufficient lift, so the critical AOA is reached at a higher airspeed. Stall speed increases as the square root of the weight ratio.

Answer

Stall speed decreases because heavier aircraft are more aerodynamically efficient.

Answer

Weight has no effect on stall speed: stall is determined solely by angle of attack.