How is advancing blade concept different from contra rotating blades?
Answers
Aircraft equipped with contra-rotating propellers, also referred to as CRP,[1] coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston or turboprop engine to drive two coaxial propellers in contra-rotation (rotation about the same axis in opposite directions). Two propellers are arranged one behind the other, and power is transferred from the engine via a planetary gear or spur gear transmission.
advancing blade
advancing bladeIn a translational flight, the rotor blade moving forward into the relative airflow (i.e., it is moving in the same direction as the helicopter). Each blade advances through 180° of its travel, normally from dead-astern to dead-ahead. In the case of clock-wise-rotating rotors, the advancing blade will be in the left half of the rotor disc when the helicopter is moving forward; if moving backward, it will be in the right half. If moving sideward to the left, it will be in the rear half; and if moving sideward to the right, it will be in the forward half.