Which of the following factors does NOT affect the amount of lift generated by an airfoil?

Engine power does not directly affect the amount of lift generated by an airfoil. Lift is primarily influenced by factors such as airspeed, angle of attack, and wing surface area.

Airspeed is critical because lift increases with the square of the velocity. As the speed of the aircraft increases, more air moves over the wings, resulting in greater lift generation due to faster air over the upper surface as compared to the lower surface.

The angle of attack is also a vital factor; it defines the angle between the chord line of the airfoil and the relative wind direction. Increasing the angle of attack increases lift up to a certain point, beyond which stall occurs, and lift decreases.

Wing surface area contributes to lift because a larger wing can displace more air, leading to an increase in lift. Therefore, while engine power can affect the aircraft's speed and climb rate, it does not directly determine the lift generated by the airfoil itself.