ABSTRACT
In the earlier chapter, the flap dynamics of the rotor blade was developed either under hovering condition or under steady forward motion of the hub (or helicopter). For the study of the flight dynamics of the helicopter, it is essential to develop the flap dynamic equation by including a general motion of the hub and analyzing the effect of the hub motion on rotor blade flap motion. It may be noted that hub motion is created due to fuselage translational and rotational motions. While developing the equations, it is assumed that the fuselage is a rigid body and that it can undergo rigid body translation and rotation motions. The flap dynamic equation of a rotor blade is developed in a systematic manner in the following.
