What shape of a rotor blade has a positive impact on the lift distribution?

Question

Question PPL(H) - Private Pilot License - Principles of Flight (Helicopter)

QuizVDS · Accepted Answer

Double trapezoidal rotor blade with a radius at the blade tip

QuizVDS · Answer

Rectangular blade with a geometric setting of 1°

QuizVDS · Answer

Trapezoidal blade without radius at the blade tip

QuizVDS · Answer

Rectangular trapezoidal blade with no aerodynamic twist

Id 687 - PPL(H) EN - What shape of a rotor blade has a positive impact on the lift distribution?