Abstract: The study on the change rule of projectile attitude is important in improving either the attacking capability of projectiles or the protective capability of projects. The dynamics process of projectile subjected to deflecting force is discussed, and the change rule of motion parameters is analyzed. An in-depth study is given to the phenomena of which a projectile strikes and penetrates the metallic cone, and a mo-del for forecasting leading-yaw performance of solid cone is established. The difference between yawing processes of solid cone and hollow cone is analyzed, and a model for forecasting yawing performance of hollow cone is founded with a correction modulus applied on that of solid cone. The experimental verification of the model for hollow cone proves that the computational results are in good agreement with the experimental results.

Key words: ordnance science and technology, metallic cone, penetrating projectile, yawing, prediction model