During translational flight forward, which portion of the disc creates the most lift?

• A. Forward half
• B. Aft half
• C. Center portion
• D. Outer ring

Answer: (A)

In forward flight, translational lift comes from the rotor moving through air that is already being accelerated by the fuselage. The portion of the disc that is ahead in the direction of travel encounters this undisturbed/accelerated air first, which increases the local relative wind and effectively raises the angle of attack for the blade elements there. This extra aerodynamic input boosts lift more in the forward half of the disk than in the rear half. The aft portion fights more against the rotor’s downwash and sees less favorable relative wind, so it contributes less lift. As a result, the forward half of the disc generates the most lift during translational forward flight.