Flight Stability And Automatic Control Nelson Solutions -

For directional stability, the following condition must be satisfied:

The directional stability derivative (Cnβ) is given by: Flight Stability And Automatic Control Nelson Solutions

The static margin (SM) is given by:

Altitude Sensor → Controller → Actuator → Aircraft → Altitude Sensor For directional stability, the following condition must be

SM = (xcg - xnp) / c