TY JOUR TI Core system with concentrated masses as a calculated model of the spherical movement of the aircraft KW distributed mass KW concentrated mass KW rotation around a fixed point (spherical) KW substitution KW balance weight KW double gimbal KW Lagrange equations KW inertial equivalence KW nutation KW precession KW inertialess stop KW gyroscopic effects JO Journal of Technical Research AU samonov, s.a. PY 2019 IS 5 PB INFRA-M Academic Publishing LLC.