Effect of Some Disturbance Factors on the Motion Stability of Unguided Rocket


  • Ban Huu Le Le Quy Don Technical University, Hanoi, Vietnam
  • Pavel Konečný University of Defence in Brno, Czech Republic




A mathematical model for unguided-rockets' motion in the air taking into account the deflection of the thrust vector and the position deviation of the center of gravity is established. The mathematical model is solved for specific rocket slow spin. Some calculated results then were compared with standard values given by its supplier. The effect of the disturbance factors on the motion stability is shown through the deviation of the graph of the angle of attack and the trajectory dropping points compared to the corresponding values of the standard trajectory, which does not contain deviations.

Author Biographies

  • Ban Huu Le, Le Quy Don Technical University, Hanoi, Vietnam

    Department of Weapons, Engineer

  • Pavel Konečný, University of Defence in Brno, Czech Republic

    Department of weapons and ammunition, professor


LE, A.D., NGUYEN, H.D. and TRAN, L.N. Flight Theory and Air Defense Missile Control System (in Vietnamese). Hanoi: Military Technical Academy, 1998. 166 p.

NGUYEN, V.T. and NGUYEN, D.S. External Ballistic Textbook (in Vietnamese). Hanoi: Military Technical Academy, 2003. 379 p.

KONEČNÝ, P. Exterior Ballistics of Rockets. Brno: University of Defence in Brno, 2006. 128 p. ISBN 978-80-7231-200-9.

MORARU, F. and SAFTA, D. Mathematical Model for the Rocket General Motion Simulation in Presence of Various Perturbations. In Proceedings of the 5th Conference on Weapon Systems. Brno: Military Academy, 2001, p. 66-81.

KHALIL, M., ABDALLA, H. and KAMAL, O. Trajectory Prediction for a Typical Fin Stabilized Artillery Rocket. In Proceedings of the 13th International Conference on Aerospace Sciences & Aviation Technology. Cairo: Military Technical College, 2009, p. 1-14. https://doi.org/10.21608/asat.2009.23742.

CAUGHEY, D. Introduction to Aircraft Stability and Control [online]. New York: Sibley School of Mechanical & Aerospace Engineering, 2011. 153 p. [viewed 2019-11-20]. Available from: https://courses.cit.cornell.edu/mae5070/Caughey_2011_04.pdf

GRAUER, J., MORELLIY, E. and MURRIZ, D. Flight Test Techniques for Quantifying Pitch Rate and Angle of Attack Rate Dependencies. Journal of Aircraft, 2017, vol. 54, no. 6, p. 2367-2377. https://doi.org/10.2514/1.C034407.

CHARUBHUN, W., CHUSILP, P. and NUTKUMHANG, N. Effects of Aerodynamic Coefficient Uncertainties on Trajectory Simulation of a Short-range Solid Propellant Free Rocket [online]. In Proceedings of the 26th International Symposium on Ballistics. Miami, 2011. [viewed 2019-11-12]. Available from: https://www.academia.edu/7623368/EFFECTS_OF_AERODYNAMIC_COEFFICIENT _UNCERTAINTIES_ON_TRAJECTORY_SIMULATION_OF_A_SHORT-RANGE_SOLID_PROPELLANT_FREE_ROCKET

NGUYEN, D.P. Researching the Effects of Some Initial Disturbance Factors on Firing Accuracy (in Vietnamese) [PhD Thesis]. Hanoi: Military Technical Academy, 2016. 134 p.

Jet Bullets M21-ΟΦ-VN. Industry standards 06TCN743 (in Vietnamese). Vietnam, 1999.

Fighting Vehicle BM – 21 (in Russian) [Technical Specifications]. Moscow: Military Publishing House, 1980. 99 p.






Research Paper


How to Cite

Effect of Some Disturbance Factors on the Motion Stability of Unguided Rocket. (2020). Advances in Military Technology, 15(2), 405-423. https://doi.org/10.3849/aimt.01379