blade flapping

blade flapping

blade flapping
The vertical movement of a helicopter rotor blade about a horizontal or flapping hinge, in which the blades tend to rise and descend with respect to the rotor hub as they rotate. Blade flapping tends to minimize asymmetrical lift by increasing the angle of attack of the retreating blade while decreasing the angle of attack of the advancing blade.
References in periodicals archive ?
Current development incorporates realistic blade flapping dynamics and exact trim procedures for teetering and articulating rotors into the analysis code.