| The launching backward force of weapon system is composed of the friction drug and the frontal impact force to the rocket launcher generated by the flow of the exhaust flow in the launching tube as the rocket is launched. If the backward force is overload, the flight attitude and the safety of the armed helicopter will be affected seriously in the aerial rocket weapon system of armed helicopters.The paper confirms the main factor of backward force by analyzing the generation of backward force. The technique of initial part, burning surface and time-limit burning were applied in the design of rocket engine and the decomposition and guide flow of the exhaust flow with the fairing case applied in the design of rocket launcher by analyzing and counting reduces greatly the frontal impact force to the rocket. The low launching backward force of the weapon system is realized finally. |