The stall speed of an airplane is most affected by variations in airplane loading.

The stall speed of an airplane is most affected by variations in airplane loading.

• A. True
• B. False
• C. Only at high altitude
• D. Only in turbulence

Answer: (A)

Stall speed is determined by the amount of lift needed to support the airplane’s weight. When an airplane is in level flight, lift must equal weight. Lift is proportional to ½ ρ V^2 S CLmax, so solving for the stall speed gives Vs = sqrt[(2W) / (ρ S CLmax)]. This shows stall speed increases with weight (the airplane’s loading). If you load more fuel or payload, the weight W goes up, and the speed needed to generate the necessary lift goes up as the square root of that weight increase. While density (altitude) and gusts can influence stall characteristics, they don’t change as directly or as strongly as loading does. Heavier loading regularly pushes stall speed higher, lighter loading lowers it, so the statement is true.

Stall speed is determined by the amount of lift needed to support the airplane’s weight. When an airplane is in level flight, lift must equal weight. Lift is proportional to ½ ρ V^2 S CLmax, so solving for the stall speed gives Vs = sqrt[(2W) / (ρ S CLmax)]. This shows stall speed increases with weight (the airplane’s loading). If you load more fuel or payload, the weight W goes up, and the speed needed to generate the necessary lift goes up as the square root of that weight increase. While density (altitude) and gusts can influence stall characteristics, they don’t change as directly or as strongly as loading does. Heavier loading regularly pushes stall speed higher, lighter loading lowers it, so the statement is true.