V. I. Biryuk - Ph.D. (Eng.), Associate Professor, Lecturer, Department of Aircraft Strength, Moscow Institute of Physics and Technology (State University), Chief Research Scientist, Central Aerohydrodynamic Institute. E-mail: v_biryuk@yahoo.com
H. Ph. Nguyen - Post-graduate Student, Department of Aeromechanics and Flight Engineering, Moscow Institute of Physics and Technology (State University). E-mail: loicuagio100884@yahoo.com