An aircraft that has a large negative IYMP will tend to spin in a flatter nose attitude than an aircraft that is
neutrally loaded or wing-loaded. The inertial moments on the spinning aircraft will pull the nose toward the
horizon (Figure 7). As you will see later, the mass distribution will also significantly affect spin recovery
Nose Rises Due to
Fly Wheel Effect
Figure 7: PITCHUP DUE TO INERTIAL COUPLING
(This is not an all inclusive definition.) That AOA beyond which a further increase in AOA will produce a
decrease in lift.