What allows the removal of drag hinges in semi-rigid rotor systems?

Question

Question PPL(H) - Private Pilot License - Aircraft General Knowledge

QuizVDS · Accepted Answer

Rotor blade attachment below the central flapping hinge

QuizVDS · Answer

Use of a gimbal ring with central flapping hinge

QuizVDS · Answer

Geometric or aerodynamic twist of the rotor blades

QuizVDS · Answer

Additional cone hinges on the rotor head

Id 152 - PPL(H) EN - What allows the removal of drag hinges in semi-rigid rotor systems?