Which of the following is not a component of the engineer's lift formula?

• A. Coefficient of Lift
• B. Air Density
• C. Angle of Attack
• D. Wing Surface Area

Answer: (C)

Lift in the standard aerodynamic equation comes from four direct factors: air density, velocity (squared), wing area, and the lift coefficient. The lift equation is L = 0.5 * rho * V^2 * S * Cl, so rho (air density), V^2 (velocity), S (wing surface area), and Cl (lift coefficient) are the direct inputs. Angle of attack isn’t a separate term in that formula; it affects lift by changing the lift coefficient, but it isn’t itself a separate factor you multiply into the equation. So even though increasing angle of attack can raise lift, the formula doesn’t list angle of attack as a direct component.