In a level turn, how does bank angle affect stall speed and load factor?

• A. Stall speed decreases with bank angle due to better lift
• B. Stall speed stays the same during a level turn
• C. Stall speed increases with bank angle due to higher load factor
• D. Only pitch affects stall speed in a level turn

Answer: (C)

In a level turn, banking increases the load factor, meaning you must generate more lift to both support the weight and provide the centripetal force for the turn. As bank angle φ grows, the load factor n rises roughly as n = 1/cos φ. To maintain altitude, the wing must produce Lift ≈ Weight × n, which requires a higher angle of attack toward the lift curve’s maximum.

Stall happens when lift reaches its maximum possible value, L = (1/2) ρ V^2 S Clmax. With a higher required lift for the turn, the speed at which you reach Clmax (the stall speed) also increases. Mathematically, the stall speed in a level turn is Vs_turn = Vs straight-and-level × sqrt(n); since n increases with bank, Vs_turn increases with bank angle.

So, the stall speed goes up as you increase bank angle in a level turn because the load factor is higher, requiring more lift at the same airspeed and moving the aircraft closer to the stall.