HELICOPTER AERODYNAMICS WORKBOOK
center of mass is farther away, it will tend to lag (move slower). Geometric imbalance occurs
when rotor blade centers of mass are not equidistant from the center of rotation.
Rotor blades generally work best as a team, the three combinations you are most likely to
encounter are the semi-rigid, fully articulated, and rigid rotor systems, all of which allow for
flapping and compensate for geometric imbalance. These systems allow for pilot control of the
rotor blades through use of the cyclic and collective controls (figure 2-13).
2-10 ROTOR BLADE AERODYNAMICS