Abstract:

The new aerodynamic principle of additional rolling and yaw moment of aircraft in ground effect is analyzed. And the lateral aerodynamics’ changing regularity with height of an agriculture aircraft during lowaltitude flight operation is presented. A new criterion of lateral static stability in ground effect is deduced, and the change trend of lateral static stability on different heights is analyzed. Using the lateral equations of aircraft in ground effect, the properties of lateral modes of an agriculture aircraft with variations of height during lowaltitude flight operation are calculated, and the modes’ changing regularity is analyzed. The lateral modes are approximately simplified and the rationality is verified by numerical simulation.

Key words: agriculture , aircraft,  , low-altitude,  , ground , effect,  , mode , simplification,  , lateral , stability